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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.

Steady Motion

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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. - PowerPoint PPT Presentation

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Page 1: 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.

Page 2: Steady Motion

Revision card

• Make a revision card for momentum.

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6 mark question

• Use the idea of momentum to explain why cars are built with crumple zones.

Marks SPAGWhat 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.

Page 4: Steady Motion

Learning Outcomes

1) 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

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Speed – Time – graph

For each of the 4 stages, draw a force diagram to show what is happening.

A

BC

D

Time

Speed

Page 6: Steady Motion

Mini Plenary worksheet.

explain that no resultant force is required to keep an object moving in a straight line at a steady speed

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What are these strange people trying to do?

• Curling

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On the floor

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On Ice

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

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Lets investigate -

• Which surface is closest to “perfect ice”?

Surface Force needed to move object (N)

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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.

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6 mark question

• Use the idea of momentum to explain why cars are built with crumple zones.

Marks SPAGWhat 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.

Page 14: Steady Motion

Round the Room Questions

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Task

• Write 5 momentum questions of your own, and produce a marking scheme.

• Swap with neighbour, complete their questions and WWW/ EBI them.

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Look at the objectives – how are we doing?