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Steady Motion

Steady Motion . How do objects move at a steady speed? . Starter: Describe the forces acting on a car moving at a steady velocity of 60mph, forwards. . Revision card . Make a revision card for momentum. . 6 mark question.

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Steady Motion

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  1. Steady Motion How do objects move at a steady speed? Starter: Describe the forces acting on a car moving at a steady velocity of 60mph, forwards.

  2. Revision card • Make a revision card for momentum.

  3. 6 mark question • Use the idea of momentum to explain why cars are built with crumple zones. Marks SPAG What a crumple zone is/ where they are on a car. How a crumple zone reduces the force on a person. Use of the correct momentum equation. What happens if no crumple zone.

  4. Learning Outcomes • explain that, when an object travels at a steady velocity, there is no change of momentum. 2) explain that no resultant force is required to keep an object moving in a straight line at a steady speed

  5. Speed – Time – graph Speed For each of the 4 stages, draw a force diagram to show what is happening. C B D A Time

  6. Mini Plenary worksheet. explain that no resultant force is required to keep an object moving in a straight line at a steady speed

  7. What are these strange people trying to do? • Curling

  8. On the floor

  9. On Ice

  10. On “perfect” ice the kettle never stops, it stays at a steady speed. Why?

  11. Lets investigate - • Which surface is closest to “perfect ice”?

  12. Steady Speed and Momentum • Look at the equations for momentum and work out why at a steady speed, momentum of an object does not change.

  13. 6 mark question • Use the idea of momentum to explain why cars are built with crumple zones. Marks SPAG What a crumple zone is/ where they are on a car. How a crumple zone reduces the force on a person. Use of the correct momentum equation. What happens if no crumple zone.

  14. Round the Room Questions

  15. Task • Write 5 momentum questions of your own, and produce a marking scheme. • Swap with neighbour, complete their questions and WWW/ EBI them.

  16. Look at the objectives – how are we doing?

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