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1. Which tool below can you use to measure force? a. Ruler b. spring scale

1. Which tool below can you use to measure force? a. Ruler b. spring scale . c. pan balance. d. electronic scale. 2. Mongtuyen is trying to push a box across a floor. What type of friction is making it difficult to start moving the box? heat friction rolling friction

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1. Which tool below can you use to measure force? a. Ruler b. spring scale

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  1. 1. Which tool below can you use to measure force? a. Ruler b. spring scale c. pan balance d. electronic scale • 2. Mongtuyen is trying to push a box across a floor. What type of friction is making it difficult to start moving the box? • heat friction • rolling friction • static friction • sliding friction • 3. Four students roll basketballs across four surfaces with the same amount of force. Which ball will most likely travel the farthest? • the basketball rolling on grass • the basketball rolling on a tile floor • the basketball rolling on carpet • the basketball rolling on a sandy path What causes the changes in daily tides? a. Earth’s gravitational pull on itself b. the Sun’s gravitational pull on Earth c. Mercury’s gravitational pull on Earth d. the Moon’s gravitational pull on Earth

  2. The force that resists the movement of one surface past another is called? a. inertia b. gravity c. friction d. force A push or pull is called a/an? a. inertia b. gravity c. friction d. force Soil erosion by wind is an example of? a. inertia b. gravity c. friction d. force • Increasing friction means that the two surfaces will • Slide against each other the same • Cease to exist • Be less difficult to slide against each other • Be more difficult to slide against each other

  3. What force keeps the Moon from shooting straight out into outer space? a. the gravitational pull of Earth b. the gravitational pull of the Sun c. the tiny amount of friction in space d. the massive amount of friction in space • Earth’s gravitational force will have the greatest affect on • a 160-pound person in an airplane • a 160-pound person walking on the Moon • a 160-pound person standing at sea level • a 160-pound person on top of Mount Everest • Which is an example of a force acting at a distance • A train pulls train cars • A child pulls on a rope • A magnet pulls an iron nail • A marble is bumped by another marble • What force is measured with the tool known as a spring scale • inertia • magnetism • volume • gravity

  4. Making a surface rougher is an example of ___________ friction a. decreasing b. increasing c. not changing d. losing Adding oil to a surface is an example of ___________ friction a. decreasing b. increasing c. not changing d. losing Balanced forces cause objects at rest a. to remain at rest b. to keep moving at the same speed and direction c. to go crazy d. to change speed or direction Balanced forces cause moving objects a. to remain at rest b. to keep moving at the same speed and direction c. to go crazy d. to change speed or direction

  5. 1. The action of a pogo stick is like the front legs of a racehorse because a. The legs rebound as the horse runs b. Horses have tendons like springs c. Fast horses have stiff legs d. Horses have rubber shoes • 2. Researchers studied the physics of racehorse motion by • Building life size models • Graphing the speeds of all KY Derby winners • Creating computer models • Studying photos of KY Derby races • 3. You will bounce higher on a pogo stick if • Your legs have great flexibility • You store more energy in the pogo stick’s spring • Your parents learned to bounce on pogo sticks • You wear heavy weights on your ankles • 4. If a horse slides in mud, the force of friction between its feet and the ground must be • high • low • stiff • increasing

  6. Changing a floor surface from smooth tile to rough carpet is an example of ___________ friction a. decreasing b. increasing c. not changing d. losing Forces are described by their a. Size and direction b. Size and speed c. Motion and direction d. Motion and speed Friction causes heat generation, less efficiency, loss of useable energy a. Maybe b. True c. False d. None of the above What causes the changes in daily tides? a. Earth’s gravitational pull on itself b. the Sun’s gravitational pull on Earth c. Mercury’s gravitational pull on Earth d. the Moon’s gravitational pull on Earth

  7. Sam on the left, pushes the box with a force of 20 newtons. Ling on the right, pushes the same box with a force of 10 newtons. What is the amount of force acting on the box? a. 30 newtons b. 200 newtons c. 10 newtons d. 0 newtons Sam on the left, pushes the box with a force of 20 newtons. Ling on the right, pushes the same box with a force of 10 newtons. Which direction will the box move? a. To the right b. To the left c. It won’t move d. None of the above Sam on the left, pushes the box with a force of 20 newtons. Ling is also on the left and pushes the same box with a force of 10 newtons. What is the amount of force acting on the box? a. 30 newtons b. 200 newtons c. 10 newtons d. 0 newtons • Increasing friction means that the two surfaces will • Slide against each other the same • Cease to exist • Be less difficult to slide against each other • Be more difficult to slide against each other

  8. Suppose a person walks 3km in 30 minutes. What is the best way to express that speed? a. 6 km/hr b 100 m/min c. 300 m/3min d. 6000 m/hr • When rolling a toy car down a ramp, how could you increase the speed of the toy car • Increase the length of the ramp • Decrease the length of the ramp • Increase the height of the ramp • Decrease the height of the ramp • After riding a skateboard for 20 minutes, the rider picks up the skateboard and notices that the wheels feel warm. What force has warmed the wheels? • Friction between the skateboard’s wheels and the ground • Inertia of the skateboard and the rider • Magnetism of Earth • Gravitational attraction between the skateboard and Earth • Earth’s gravitational force will have the greatest affect on • a 160-pound person in an airplane • a 160-pound person walking on the Moon • a 160-pound person standing at sea level • a 160-pound person on top of Mount Everest

  9. When might you want to increase friction a. To make it easier for you to moon walk like Michael Jackson b. To increase the distance your bowling ball will roll c. To make it easier for your paper football to slide farther d. To keep from sliding on the ice on your front steps Sam on the left, pushes the box with a force of 20 newtons. Ling is also on the left and pushes the same box with a force of 10 newtons. Which direction will the box move? a. To the right b. To the left c. It won’t move d. None of the above • In a game of marbles, players take turns trying to knock their opponent’s marbles out of a circle. The first player aims a slightly larger marble (called a “taw”) at the smaller marbles in the middle of the circle. Why does a marble that got hit move? • Inertia causes the marble to move • Friction causes the marble to move • An unbalanced force has been produced • A force that acts at a distance has been produced Balanced forces cause objects at rest a. to remain at rest b. to keep moving at the same speed and direction c. to go crazy d. to change speed or direction

  10. In which of the following would you expect to see no movement? a. a 2-N force pulling up and a 5-N force pushing down b. a 2-N force pulling up and a 3-N force pushing down c. a 3-N force pulling to the left and a 3-N force pulling to the right d. a 5-N force pulling to the left and a 4-N force pulling to the right A baseball player hits the ball with his bat. Which of the following statements is true about the force of the baseball hitting the bat? a. The baseball hits the bat with an opposite but equal force. b. The baseball hits the bat with an opposite and lesser force. c. The baseball hits the bat with an opposite and double force. d. The baseball hits the bat with an opposite and greater force. Which of the following is an example of increasing friction intentionally? a. waxing skis b. adding grease to gears on a bike c. throwing sand on an icy driveway d. oiling a squeaky door Balanced forces cause moving objects a. to stay in motion b. to keep moving at the same speed and direction c. to remain at rest d. to change speed or direction

  11. 1. Which tool measures the force of a pull? • a. Ruler • spring scale • Triple beam balance • Thermometer Changing a floor surface from smooth tile to rough carpet is an example of ___________ friction a. decreasing b. increasing c. not changing d. losing Sometimes when the shooter’s taw hits a marble to push it out of the circle, the taw bounces off in the opposite direction. What force caused the taw to change directions? a. Earth’s gravity b. Earth’s magnetism c. Force from the marble that got pushed out of the circle d. Force from the taw that was not used up in the collision • The amount of force needed to pull an object across sandpaper as compared to cardboard • Will increase • Will decrease • Will be equal • Will be non-existent

  12. The force that resists the movement of one surface past another is called? a. inertia b. gravity c. friction d. force Sam on the left, pushes the box with a force of 5 newtons. Ling on the right, pushes the same box with a force of 15 newtons. What is the amount of force acting on the box? a. 20 newtons b. 200 newtons c. 10 newtons d. 0 newtons Which of the following is an example of decreasing friction intentionally? a. Wearing rubber bottom shoe soles instead of leather b. Putting carpet over wooden floors c. throwing sand on an icy driveway d. oiling a squeaky door • The amount of force needed to pull an object across a slick surface as compared to cardboard • Will increase • Will decrease • Will be equal • Will be non-existent

  13. What force keeps the Moon from shooting straight out into outer space? a. the gravitational pull of Earth b. the gravitational pull of the Sun c. the tiny amount of friction in space d. the massive amount of friction in space • When rolling a toy car down a ramp, how could you increase the speed of the toy car • Increase the length of the ramp • Decrease the length of the ramp • Increase the height of the ramp • Decrease the height of the ramp Friction causes heat generation, less efficiency, loss of useable energy a. Maybe b. True c. False d. None of the above • The amount of force needed to pull a heavier object as compared to a light object will • Increase • Decrease • be equal • be non-existent

  14. Making a surface rougher is an example of ___________ friction a. decreasing b. increasing c. not changing d. losing When might you want to increase friction a. To make it easier for you to moon walk like Michael Jackson b. To increase the distance your bowling ball will roll c. To make it easier for your paper football to slide farther d. To keep from sliding on the ice on your front steps Air resistance is a type of a. motion. b. acceleration. c. velocity. d. friction. • Friction between a ball and the ground will cause • The ball to slow down • The ball to speed up • The batter’s hands to sting • The ball to get heavier

  15. In which of the following would you expect to see no movement? a. a 2-N force pulling up and a 5-N force pushing down b. a 2-N force pulling up and a 3-N force pushing down c. a 3-N force pulling to the left and a 3-N force pulling to the right d. a 5-N force pulling to the left and a 4-N force pulling to the right Friction causes heat generation, less efficiency, loss of useable energy a. False b. Partially correct c. True d. None of the above • What type of friction acts on a bowling ball as it travels toward the pins • static • sliding • rolling • thermal • The amount of force needed to pull an object straight up as compared to across will • Increase • Decrease • be equal • be non-existent

  16. There exists only one type of force • maybe • true • false • None of the above • All objects exert a gravitational pull on all other objects • maybe • true • false • None of the above • Gravitational force is the force of attraction between any object and every other object in the universe • maybe • true • false • None of the above • The greater the mass of an object, the stronger its gravitational force • maybe • true • false • None of the above

  17. Gravitational force depends not only on mass, but also on the distance between two objects • maybe • true • false • None of the above Speed equals distance divided by a. time. b. velocity. c. size. d. motion. If the tires on a bike are worn smooth, friction between the tires and road would a. increase b. decrease c. Stay the same d. Become zero • When using a spring scale on different planets • The measure will only be larger • The measure will only be smaller • The measure will not work • The measure may be larger or smaller depending on the planet’s mass

  18. Why does an astronaut weigh less on the Moon • The diameter of Earth is greater than the diameter on the Moon • The Earth rotates more rapidly than the Moon • The mass of the Moon is only 1/6 that of Earth • The Moon has a greater gravitational pull than Earth • Gravitational force depends on both the mass and the distance between two objects • maybe • true • false • None of the above Which tools could you use to find the speed of a bicycle a. Meter stick and stopwatch b. There are no tools to use c. Wheel and axle d. Pedal and gear To graph speed, the x and y axis are a. Time and Distance b. Force and Time c. Distance and Size d. Force and Size

  19. If all forces are balanced, the net force will equal ______? a. Twice as much b. Half as much c. zero d. Triple Air resistance is a type of a. motion. b. acceleration. c. velocity. d. friction. Sam pushes a box up with a force of 20 newtons. Ling pushes down on the same box with a force of 20 newtons. Which direction will the box move? a. Up b. Down c. It won’t move d. Up and down Forces are described by their a. Size and direction b. Size and speed c. Motion and direction d. Motion and speed

  20. Jack noticed sand on his toy car track. What would happen if he cleaned the track? a. Friction would decrease, so the toy car would go faster on the track b. Friction would increase, so the toy car would go faster on the track c. Friction would increase, so the toy car would stop d. Friction would stay the same, but the momentum of the car would increase Friction causes heat generation, less efficiency, loss of useable energy a. False b. Partially correct c. True d. None of the above You can show the motion of an object on a line graph in which you plot distance against a. velocity. b. time. c. speed. d. direction. In a lab, students pulled a block of wood across a table top recording the force as 0.5N. The students then turned the same block so that twice the surface area of the block touched the table and recorded the force of the pull as a. 0.2N b. 0.5N c. 1.0N d. 0.7N

  21. The units used in measuring forces are • milliliters • newtons • milligrams • millimeters Forces are described by their a. Size and direction b. Size and speed c. Motion and direction d. Motion and speed In a lab, students hung a block of wood from a spring scale and recorded the force as 0.4N. The students then hung a different block of wood that had double the mass and recorded that force as a. 0.2N b. 0.4N c. 0.8N d. 1.2N The amount of matter in an object is called its a. inertia. b. mass. c. force. d. balance.

  22. A student ran 200 meters in 2 minutes. That student could find their a. No speed b. Force of speed c. Instantaneous speed d. Average speed To find instantaneous speed, you could a. Measure the total distance b. Record the total time c. Use a radar gun d. None of the above A train that travels 100 kilometers in 4 hours is traveling at what average speed? a. 50 km/h b. 100 km/h c. 2 km/h d. 25 km/h A student ran 200 meters in 2 minutes. That student ran at what average speed? a. 50 m/min b. 100 m/min c. 400 m/min d. 25 m/min

  23. Which of the following balls would require the MOST force to cause it to accelerate • Ping pong ball • Tennis ball • baseball • Bowling ball What is the difference between speed and velocity? a. Speed measures linear motion only. b. Speed does not include a time measurement. c. Velocity is the speed of an object measured in 1 hour. d. Velocity is the speed of an object in a particular direction. When you know both the speed and direction of an object’s motion, you know the a. average speed of the object. b. acceleration of the object. c. distance the object has traveled. d. velocity of the object. When an object’s distance from another object is changing, a. it is in motion. b. it is speeding. c. it has a high velocity. d. it is accelerating.

  24. Newtons First Law of Motion Newtons Second Law of Motion Newtons Third Law of Motion Known as Known as Known as INERTIA ACCELERATION ACTION/REACTION • An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line, unless acted on by an unbalanced force. • The acceleration of an object depends on the mass of the object and the size of the force applied. • Acceleration = net force ÷ mass • A=F/M • Force =MassXAcceleration • F=M X A • When a force is applied to an object, the object exerts an equal force in the opposite direction. • For every action there is an equal and opposite reaction. Momentum: can be used to find the force needed to stop a moving object. Momentum = mass X velocity Conservation of Momentum

  25. The “sting” a batter feels when hitting the ball is an example of a. Newton’s first law of motion b Newton’s second law of motion c. Newton’s third law of motion d. None of the above • According to Newton’s third law of motion, what happens when a fielder catches a ball • The ball accelerates before hitting the glove • The ball stops when it hits the glove • The impact of the catch pushes the fielder’s body backward • The fielders body moves forward after catching the ball According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail a. creates a friction with the hammer. b. disappears into the wood. c. exerts an equal force back on the hammer. d. moves at a constant speed. A baseball player hits the ball with his bat. Which of the following statements is true about the force of the baseball hitting the bat? a. The baseball hits the bat with an opposite but equal force. b. The baseball hits the bat with an opposite and lesser force. c. The baseball hits the bat with an opposite and double force. d. The baseball hits the bat with an opposite and greater force.

  26. Balanced forces cause moving objects a. to remain at rest b. to keep moving at the same speed and direction c. The answer isn’t shown d. to change speed or direction Balanced forces cause objects at rest a. to remain at rest b. to keep moving at the same speed and direction c. The answer isn’t shown d. to change speed or direction Un-Balanced forces cause objects at rest a. to remain at rest b. to keep moving at the same speed and direction c. The answer isn’t shown d. to change speed or direction Un-Balanced forces cause moving objects a. to remain at rest b. to keep moving at the same speed and direction c. The answer isn’t shown d. to change speed or direction

  27. What happens when two forces act in the same direction? a. They cancel each other out. b. Subtract the smaller from the larger force. c. Add the two forces together. d. Their sum divided by two is the total force. What happens when two forces act in the opposite direction? a. They cancel each other out. b. Subtract the smaller from the larger force. c. Add the two forces together. d. Their sum divided by two is the total force. When forces are balanced, the net force = ? a. 5N. b. 10N. c. 0N. d. 1N. Forces can be added together only if they are a. acting on the same object. b. balanced forces. c. unaffected by gravity. d. substantial.

  28. I can’t feel your gravitational force because your mass is • Too small • Too large • Non-existent • None of the above If gravity is larger for objects with more mass, why don’t we feel the gravitational pull of the Sun? a. The Sun is too close b. The Sun is too hot c. The Sun doesn’t have gravity d. The Sun is too far away • Gravitational force depends not only on mass, but also on the distance between two objects • maybe • true • false • None of the above • Gravitational force is the force of attraction between any object and every other object in the universe • maybe • true • false • None of the above

  29. A train curves around on a track at the same speed it was traveling on a straight track. Which statement BEST describes the motion of the train? a. The acceleration changes b. The frame of reference stays the same c. The velocity stays the same d. The relative motion is unchanged The rate at which velocity changes is called a. speed. b. direction. c. acceleration. d. motion. On a graph showing distance versus time, a horizontal line represents an object that is a. moving at a constant speed. b. increasing its speed. c. decreasing its speed. d. not moving at all. In an acceleration graph showing speed versus time, a horizontal line shows the acceleration is a. decreasing. b. increasing. c. changing. d. constant.

  30. Which of the following will have the greatest amount of inertia? a. A pebble b. A rock c. A hill d. A mountain Which of the following will have the greatest amount of inertia? a. A dog b. A fish c. An elephant d. A butterfly The greater the mass of an object, a. the easier the object starts moving. b. the greater its inertia. c. the more balanced it is. d. the more space it takes up. If you know the distance an object has traveled in a certain amount of time, you can determine a. the size of the object. b. the speed of the object. c. the location of the object. d. None of the above

  31. What causes a rock sitting on the ground to remain in the same place unless a force acts on it? a. inertia b. friction c. momentum d. unbalanced forces According to Newton’s Second Law of Motion, which object will have the greatest acceleration if all are thrown with the same amount of force? a. baseball b. tennis ball c. bowling ball d. table tennis ball In graphing motion (distance vs. time), the steepness of the slope depends on a. how quickly or slowly the object is moving. b. how far the object has moved. c. when the object began moving. d. the direction the object is moving. If you know a car traveled 300 kilometers in 3 hours, you can find its a. acceleration. b. direction. c. average speed. d. velocity.

  32. 1. If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true? a. The object’s speed changed during the 4 hours. b. The object’s velocity did not change. c. The object accelerated during the 4 hours. d. The object decelerated during the 4 hours. 2. If a bicyclist travels 30 kilometers in two hours, her average speed is a. 30 km/h. b. 60 km/h. c. 15 km/h. d. 2 km/h. 3. Changing direction is an example of a kind of a. acceleration. b. speed. c. velocity. d. constant rate. 4. If the speed of an object does NOT change, the object is traveling at a a. constant speed. b. average speed. c. increasing speed. d. decreasing speed.

  33. What force keeps the Moon from shooting straight out into outer space? a. the gravitational pull of Earth b. the gravitational pull of the Sun c. the tiny amount of friction in space d. the massive amount of friction in space A billiards player hits a ball and this ball hits another one into a pocket at the corner of the table. What happened? a. When the balls collided both balls lost momentum. b. When the balls collided both balls gained momentum. c. The first ball slowed because it gained momentum from the cue stick. d. The first ball slowed because it gave some of its momentum to the second ball.

  34. 1. One way to increase acceleration is by a. increasing mass. b. decreasing mass. c. decreasing force. d. increasing both force and mass proportionally. 2. Force equals mass times a. speed. b. motion. c. acceleration. d. inertia. 4. The tendency of an object to resist change in its motion is known as a. mass. b. inertia. c. force. d. balance.

  35. 1. If you were on the moon, your weight would be roughly what fraction of your weight on Earth? a. one third b. one fourth c. one fifth d. one sixth 2. The law of universal gravitation states that any two objects in the universe, without exception, a. attract each other. b. repel each other. c. combine to provide a balanced force. d. create friction. 3. The force that pulls falling objects toward Earth is called a. gravity. b. free fall. c. acceleration. d. air resistance. 4. The force of gravity on a person or object at the surface of a planet is known as a. mass. b. inertia. c. air resistance. d. weight.

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