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Chapter 10

Speed and Acceleration Graphs. Chapter 10. CH10 Question 1. Describe the object’s motion in the graph above. Move a at constant speed for 4 sec, slows down for 3 seconds then speeds up but not to original velocity. CH10 Question 2. Describe the object’s motion in the graph above.

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Chapter 10

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  1. Speed and Acceleration Graphs Chapter 10

  2. CH10 Question 1 Describe the object’s motion in the graph above. • Move a at constant speed for 4 sec, slows down for 3 seconds then speeds up but not to original velocity.

  3. CH10 Question 2 Describe the object’s motion in the graph above. • Move a at constant speed for 4 s, and comes to a rest.

  4. CH10 Question 3 Describe the object’s motion in the graph above. • Positive acceleration for 5 seconds – speeds up.

  5. CH10 Question 4 Describe the object’s motion in the graph above. • Constant speed 150s, const +accl. For 100 s. Constant speed again for 50 sec, then – accl for one sec.

  6. CH10 Question 4 Calculate the object’s acceleration from 150 to 250 seconds. • Vf-Vi/t = 30-10/100= 0,2 m/s2

  7. CH10 Question 4 Calculate the object’s acceleration from 300 to 350 seconds. • Vf-Vi/t = 5m/s-30m/s/50 s= -0.5 m/s2

  8. Forces and Motion Chapter 11

  9. Question 1 State Newton’s First Law of motion • An object at rest will remain at rest and object in motion remain in motion unless acted on by a net force.

  10. Question 2 State Newton’s Second Law of Motion • An object will accelerate in the direction of a net force.

  11. Question 3 State Newton’s Third Law of Motion • For every action there is an equal and opposite reaction.

  12. Question 1 What is the equation for calculating Force when you know an object’s mass and acceleration?

  13. Question 1 What is the equation for calculating Force when you know an object’s mass and acceleration? • Force = mass x acceleration • F = ma.

  14. Question 2 What are the units for Force?

  15. Question 2 What are the units for Force? • Kg  m/s2 • N = Newton

  16. Question 3 A sailboat with a mass of 1000 kg is accelerating at a rate of 8 m/s2. What is the force of the wind acting on the sail? • F= ma • F = 1000 kg x 8 m/s2 = 8000 N

  17. Question 1 What equation do you use to calculate acceleration if you know the force acting on the object and its mass? • F= ma • A = F/m = F  m

  18. Question 2 What are the units for acceleration? • m/s2 • “meters per second squared”

  19. Question 3 What is the acceleration of a 50Kg swimmer that pushes off the side of the pool with a force of 100N? • a = F/m = 100 kgm/s2 50 kg = 2 m/s2

  20. Question 1 What is the formula used to calculate mass when you know the Force on an object and the resulting acceleration? • F = ma • m = F/a = F  a

  21. Question 2 A weight lifter accelerates the barbell at a rate of 2.0 m/s2 with an applied force 400N. What is the mass of the barbell? • m = F/a = 400 kg m/s2  5 m/s2 • = 80 kg

  22. Question 3 What is the relationship between mass and inertia?? • As the mass increases the inertia of an object increases and a greater force will be required to accelerate the object.

  23. Question 1 What is the formula used to calculate the weight of an object on Earth? • weight = mass x gravitational acceleration. • Gravitational acceleration on earth = 9.8 m/s2

  24. Question 2 What is the difference between mass and weight? • Mass is a measure of how much matter an object contains. • Weight is a measure of the force of gravity acting on that mass.

  25. Question 3 Calculate the weight of 10 kg of gold sitting on your desk. • weight = mass x ag • ag =9.8 m/s2 • W = 10 kg x 9.8 m/s2 = 98 N

  26. Question 1 Name this equation and the variables that compose it.

  27. Question 1 Name this equation and the variables that compose it. • Universal Gravitation • F = force of gravity • G = gravitational constant • m = mass of the objects • D2 = distance between the objects

  28. Question 2 According to the equation what happens to the gravitational force between two objects when they get farther apart?

  29. Question 2 According to the equation what happens to the gravitational force between two objects when they get farther apart? d2 increases and the force of gravity gets smaller.

  30. Question 3 According to the equation why does our sun have a gravitational force strong enough to hold all the planets in orbit even though some are very far away.

  31. Question 3 According to the equation why does our sun have a gravitational force strong enough to hold all the planets in orbit even though some are very far away. • The sun has a very large mass so its gravitational force is large and far reaching.

  32. Question 1 What is the term used to describe an object where the only force acting on the object is gravity ? • Free Fall

  33. Question 2 This is the maximum velocity a falling object will reach as the upward force of air resistance equals the downward force of gravity? • Terminal velocity

  34. Question 3 If an object at terminal velocity is experiencing balanced forces, how can the object still be falling? • Balanced forces only mean that the object is not ACCELERATING, it still falls @ a constant velocity.

  35. Question 1 A fluid includes which three states of matter? • Liquids, gases, and plasmas

  36. Question 2 What is the formula used to calculate pressure and what unit is pressure reported in? • P = mass  Area = N/m2 = Pa • Usually kPa (kilo Pascals)

  37. Question 3 What is the air pressure if 20 N is exerted over an area of 10m2? • P = mass/Area = 20N  10m2 • = 2 Pa

  38. Question 1 According to Bernoulli’s Principal what happens to the pressure of a fluid as the velocity of the fluid increases?

  39. Question 1 According to Bernoulli’s Principal what happens to the pressure of a fluid as the velocity of the fluid increases? • The pressure decreases.

  40. Question 2 What is the upward force exerted on an object immersed in a fluid? • Buoyant force or buoyancy.

  41. Question 3 Archimedes Principal states that for an object to float the weight of the object must be equal to or less than .. . . ?

  42. Question 3 Archimedes Principal states that for an object to float the weight of the object must be equal to or less than .. . . ? • the weight of the fluid displaced by the object.

  43. Question 1 What term is used to describe the resistance of of a gas or liquid to flow? • Viscosity.

  44. Question 2 Hydraulic devices can increase the output force by increasing the output area. Which principal predicts this characteristic? • Pascal’s Principal- the pressure of a liquid in an enclosed system is uniform throughout the system.

  45. Question 3 According to the Venturi effect, what happens to the velocity of a fluid when it is forced to flow through a smaller area?? • The velocity of the fluid increases..

  46. Question 1 What is the term for any object thrown or launched from Earth under the influence of gravity? • Projectile

  47. Question 2 Describe the horizontal and vertical forces acting on the cannon ball.

  48. Question 3 Which will hit the ground first, the cannon ball dropped straight down or the one launched sideways? They both hit at the same time – horizontal motion is independent of vertical free-fall.

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