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Unit 2 Lesson 2

Unit 2 Lesson 2. Motion and Force. Lesson 2 Key Question. Example: Consider giving a low-friction cart a quick shove along a track. When an object is moving, does this mean there must be a force pushing it in the direction of its motion?. PART 1. Giving Cart a Quick Shove.

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Unit 2 Lesson 2

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  1. Unit 2Lesson 2 Motion and Force U2L2

  2. Lesson 2 Key Question Example: Consider giving a low-friction cart a quick shove along a track. • When an object is moving, does this mean there must be a force pushing it in the direction of its motion? PART 1 U2L2

  3. Giving Cart a Quick Shove • After your shove, as it moves along the track, is there still a force pushing the cart forward?

  4. CQ 2-1: In the discussion between three students about the force acting on the cart after the quick push, whom do you agree with? • Samantha • Victor • Amara • None of them PART 1 U2L2

  5. Force and motion simulator Look at the simulator speed-time graph of a cart being given some quick pushes as it moves along a track. • Highlight the sections of the graph where the hand was pushing the cart forward. • Between your marked sections do you think there was still a force pushing the cart forward? Why do you think so? PART 2 U2L2 5

  6. CQ 2-2: Which force-time graph best represents your thinking about the force pushing the cart forward as it moves along the track? • Graph A • Graph B • Graph C A C B PART 2 U2L2

  7. What does the simulator show? Watch a movie of the simulator being run. PART 2 U2L2

  8. What does the simulator show? Which of the force-time graphs in CQ 2-2 looks most like the simulator result? PART 2 U2L2 8

  9. Force and motion • During the periods when the simulator cart was being given a shove, was there a force pushing it forward? • What action in the real world do these simulator shoves correspond to? • During the periods in between the simulated shoves was there a force pushing the cart forward? PART 3 U2L2

  10. Summarizing Questions • While the simulator cart was moving along the track, was there a force pushing the simulator cart forward the whole time or only at certain times? • During a contact push/pull interaction, what do you think is transferred from the source to the receiver: energy, force, both, or neither? • During the periods while the cart was being given a shove, its speed increased. In between these periods its speed remained constant. Why do you think the speed behaved differently during these periods? Summarizing Questions U2L2

  11. CQ 2-3: Suppose the force-time graph for a simulator cart looked like this. Which of the speed-time graphs below could be produced by applying a single force in this way? • Graph A • Graph B • Graph C Summarizing Questions U2L2

  12. Unit 2 Lesson 2 Homework Learn how force and energy analyses are related Homework U2L2

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