# Physics forces and motion

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• Created by: MRS T
• Created on: 14-02-16 22:08
What is the formula for force?
Change in momentum ÷ time taken
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What is the formula for momentum?
Mass x velocity
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What is the formula for change in momentum?
Force x time
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What is the formula for weight?
Mass x gravitational field strength
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What is air resistance?
A force that opposes the motion of an object through the air.
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What is the thinking distance?
The distance you travel before you start applying the brakes.
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What is the distance you travel while the car is decelerating to rest?
The braking distance .
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What factors affect the reaction time when driving?
If you are tired, if you have been drinking alcohol or taking drugs, or if the visibility is poor.
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When is a collision partially elastic?
When some of the movement energy is 'lost' as it is converted to heat and sound.
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What is the formula for the moment of a force?
Moment = force x perpendicular distance from pivot
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What is the condition for what is the condition for balance?
Sum of the clockwise moments = sum of anticlockwise moments
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What does the size of the gravitational force between objects depend on?
The size of the masses involved and the distance between the masses.
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What is the formula for acceleration?
Change in velocity ÷ time taken
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What is Hook's law?
The increase in length of a spring is directly proportional to the force pulling on it . If stretch beyond the elastic limit, the spring will not return to its original length.
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What does a straight line indicates a distance time graph?
Constant speed.
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What does the area under a velocity time graph indicate?
The distance travelled.
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Why are speed and distance travelled scalar quantities?
Because they do not take direction into account .
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What is velocity?
Speed in a specified direction.
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## Other cards in this set

### Card 2

#### Front

What is the formula for momentum?

Mass x velocity

### Card 3

#### Front

What is the formula for change in momentum?

### Card 4

#### Front

What is the formula for weight?

### Card 5

#### Front

What is air resistance?