# Collisions

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• Created by: Hettie
• Created on: 07-06-13 20:35
What is Newton's 3rd law?
Every action has an equal and opposite reaction.
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What is the equation for momentum?
Momentum (kg m/s) = mass (kg) X velocity (m/s) P=mv
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What is conservation of momentum?
initial total momentum = final total momentum
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What is the equation for kinetic energy?
kinetic energy (J) = ½ m (kg) X v² (m/s)
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What is the equation for impact force?
Force (J) = change in momentum ÷ time F = (mv - mu) ÷ t
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What does a seat belt or air bag do to reduce impact force?
Increases time for person to stop, reducing rate at which momentum changes, therefore force of impact is less.
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## Other cards in this set

### Card 2

#### Front

What is the equation for momentum?

#### Back

Momentum (kg m/s) = mass (kg) X velocity (m/s) P=mv

### Card 3

#### Front

What is conservation of momentum?

### Card 4

#### Front

What is the equation for kinetic energy?

### Card 5

#### Front

What is the equation for impact force?