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Apr. 24, 2019

Apr. 24, 2019. You need: Clean paper (2) / pencil Speed Machines – take home TEST (due Friday) Warm Up: Mental Math – be ready. I CAN: create and interpret graphs!. Speed, velocity, acceleration. Motion graphs. Forces/ friction. Energy. Newton’s Laws. Simple Machines.

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Apr. 24, 2019

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  1. Apr. 24, 2019 You need: Clean paper (2) / pencil Speed Machines – take home TEST (due Friday) Warm Up: Mental Math – be ready. I CAN: create and interpret graphs!

  2. Speed, velocity, acceleration Motion graphs Forces/ friction Energy Newton’s Laws Simple Machines Electrical / magnetism

  3. Teacher March Day Forces TEST Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere SWAGRRR Day Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Tests Start Review Review

  4. May 27 May 28 May 31 May 29 May 30 Review Review Science Last day of school

  5. Mental Math 1.) What is 10% of 294?

  6. Mental Math 2.) I walked 12 km. It took me 4 hours. What was my speed?

  7. Mental Math 3.) 17 + 22 – 8 =

  8. Mental Math 4.) What is 20% of $90.00?

  9. Mental Math 5.) 547 m = _____ km *Be careful to show decimal

  10. Tuesday… Monday… • Independent and dependent axes • Straight = constant • Curved = changing • Slope = speed • Horizontal = no motion • Speed • Instantaneous • Average • Constant • Velocity • Acceleration

  11. Today… • How do we make an object move (create motion)? • How do we make an object NOT move? • What factors cause motion to be faster, slower, or in a given direction?

  12. How can we describe motion? • Motion can be described by: • DISTANCE (length) • TIME (min, seconds) • SPEED (distance and time) • DIRECTION (which way) • VELOCITY…(speed and direction) • ACCELERATION (change in motion) • Speed up, slow down, change direction

  13. Speed = Distance Time Time = Distance Speed Distance = Speed x Time Speed, Distance & Time D S T

  14. Speed Machines • Will be a take home test, but still needs to be honest. No help. Calculators are okay. • Front and back. Show formula and work. • I will collect it on Friday at the beginning of class. • It will be considered a test grade.

  15. Y Dependent Distance X Independent Time

  16. SLOW MOVEMENT

  17. FASTER MOVEMENT

  18. FAST vs. SLOW FAST SLOW

  19. Starting & Stopping

  20. No Motion

  21. Slowing down Speeding Up Acceleration

  22. Place

  23. Classwork / Homework (Tues) • Take Home Test – SPEED MACHINES • Show your work! • Due Friday! • No help…although you CAN use calculators. • Graph Christy’s trip, Joey’s trip (front and back)

  24. Christy wanted to visit the zoo, which is 20 kilometers from her house.  To help her get there, her mother drove her to the bus stop 5 kilometers away from home and toward the zoo.  The trip took 5 minutes.  She had to wait for the bus for 5 minutes.  Christy was reading on the bus and missed her stop.  She finally got off the bus 10 minutes later at the next stop 1 kilometer past the zoo.  It took Christy 15 minutes to walk back to the zoo.

  25. Leg 1 It took Phil 15 minutes to walk to his favorite breakfast spot, 2 km from his house. It took Phil 2 minutes to walk to his favorite breakfast spot, 10 km from his house. It took Phil 10 minutes to walk to his favorite breakfast spot, 10 km from his house. It took Phil 15 minutes to walk to his favorite breakfast spot, 2.5 km from his house.

  26. Leg 2 The restaurant was closed, so he went to the store located 15 km away. It took Phil 35 min to get there. He spent 30 minutes at the restaurant ordering take-out food. The restaurant was closed, so he ran up the hill and arrived at the next store 0.5 km away in 10 minutes. The restaurant was closed, so he went 15 minutes to the store, located 0.5 km at the bottom of a hill.

  27. Leg 3 The lines were long at the store, so he spent 30 minutes there. The lines were long at the store, so he spent 60 minutes there. When he finished, he walked down the 0.5-km hill in 10 minutes. When he finished, he walked home in 15 minutes.

  28. Leg 4 After buying his food, he ran up the 0.5-km hill in 70 minutes. After buying his food, he returned home in 15 minutes. He bought ice cream, so he tried to hurry. He ran down the 0.5-km hill in 15 minutes. He bought ice cream, so he tried to hurry. He ran up the 0.5-km hill in 10 minutes.

  29. Leg 5 From the top of the hill, he walked 3 km for 15 minutes. From the bottom of the hill, it took him 85 minutes to get home. From the top of the hill, it took him 10 minutes to get home. He ate his meal at home in an hour.

  30. Christy wanted to visit the zoo, which is 20 kilometers from her house.  To help her get there, her mother drove her to the bus stop 5 kilometers away from home and toward the zoo.  The trip took 5 minutes.  She had to wait for the bus for 5 minutes.  Christy was reading on the bus and missed her stop.  She finally got off the bus 10 minutes later at the next stop 1 kilometer past the zoo.  It took Christy 15 minutes to walk back to the zoo.

  31. QUIZ • You may NOT use the calculator • You may NOT use your notes, neighbors, or neighbors’ notes. • Remember to give formula, substitution, and final answer with unit.

  32. Challenge • Make a ramp (books, wooden plank, ruler) • Roll the pencil (it’s Ms.Garris’s – keep it nice!) • Goal: make the pencil roll down the ramp and 30 centimeters beyond the ramp. No pushing!! Done in class 4/17

  33. Ramp Challenge • Can you adjust to make it roll 30 centimeters? How? Describe your solution. • Can you adjust to make it roll 30 cm as fast as possible? How? Describe your solution. • Can you adjust to make it roll 30 cm as slowly as possible? How? Describe your solution. Done in class 4/17 -reviewed good/bad

  34. Introduction to FORCES

  35. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something, it is PULLED to the ground by gravity. A FORCE is a PUSH or PULL in a particular DIRECTION. FORCES

  36. FORCES AFFECT HOW OBJECTS MOVE. Forces can affect motion in the following ways: They can make objects: • START MOVING • MOVE FASTER • MOVE SLOWER • STOP MOVING • CHANGE DIRECTION • CHANGE SHAPE FORCES BIG SCIENCE IDEA

  37. Identify each picture as a PUSH or a PULL. Is the force causing a change in speed or direction or both? FORCES

  38. Since forces cause changes in SPEED or DIRECTION of an object, we can say that forces change VELOCITY, so…. FORCES Forces cause ACCELERATION.

  39. More than one force can act on an object at one time. What happens to the object when forces act depends on 2 things: FORCES 1) Strength of the Forces 2) Direction of the Forces

  40. When 2 or more forces act on an object, the forces combine to form a net force. FORCES Forces may WORK TOGETHER or OPPOSE each other.

  41. If the forces cancel each other out, and do not cause the object to move, the forces are said to be BALANCED. FORCES If the forces don’t cancel each other out – 1 force is stronger than the others – the forces are UNBALANCED and will cause a CHANGE IN MOTION.

  42. The strength of a force is measured in NEWTONS. The symbol is (N). We use a SPRING SCALE to measure force. MEASURING FORCE

  43. Always “zero” your balance before use. • Pull gently and with constant force. • Practice using your spring scale to drag items across your desk. MEASURING FORCE

  44. Two forces in the same direction can add together to produce a larger net force. COMBINING FORCES + = 5 N right 5 N right 10 N right

  45. Two forces in opposite directions can subtract to produce a smaller net force in the direction of the larger force. COMBINING FORCES - = 5 N right 10 N left 5 N left

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