Friction Vocabulary and Concepts
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Friction Vocabulary and Concepts
Friction: helpful or unhelpful?
Friction is a force that acts between surfaces in contact. It usually opposes their movement. How much friction there is depends partly on the surfaces and how strongly they are pressed together.
- A force that pulls every object towards the ground
- A force between touching surfaces that opposes movement
- A force that makes objects move without touching
- A force that always speeds objects up
- Friction
- Surface
- Lubricant
- Grip
- D. The ability of a surface to hold firmly without slipping
- A. A substance that reduces friction between surfaces
- B. The outer layer of an object that another object can touch
- C. A force that opposes movement between touching surfaces
Investigate the playground
Imagine testing the same toy car by releasing it from the same starting point on different surfaces. The car rolls furthest on the smooth surface and stops sooner on a rough surface.
- It speeds up because the wheel is pushed forwards
- It slows down or stops because friction opposes the wheel's movement
- It floats because the surfaces no longer touch
- It moves at the same speed because brakes remove friction
3 printable pages
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