# physics

What is the unit of force?
The newton, N
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What happens to a moving object if the resultant force on it is zero?
If the resultant force on an object is zero it keeps moving.
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What happens to a moving object if the resultant force on it is not zero?
If the resultant force on an object is not zero it speeds up in the direction of the resultant force.
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If we double the resultant force applied to an object, what happens to its acceleration?
If we double the resultant force applied to an object its acceleration doubles.
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What force is needed to give an acceleration of 2 m/s2 to a 4 kg box?
8 N
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4 N is applied to a 2 kg object. What is its acceleration?
Acceleration = 4 ÷ 2 = 2 m/s2.
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What force is needed to give an acceleration of 10 m/s2 to a 250 g box?
250 g = 0.25 kg, so force = 0.25 × 10 = 2.5 N.
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What does a horizontal line on a distance-time graph represent?
A stationary object.
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What does a horizontal line on a velocity-time graph represent?
A horizontal line on a velocity-time graph represents constant velocity.
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What does the gradient on a distance-time graph represent?
The gradient on a distance-time graph represents the speed.
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What does the gradient on a velocity-time graph represent?
The gradient on a velocity-time graph represents the acceleration.
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## Other cards in this set

### Card 2

#### Front

What happens to a moving object if the resultant force on it is zero?

#### Back

If the resultant force on an object is zero it keeps moving.

### Card 3

#### Front

What happens to a moving object if the resultant force on it is not zero?

### Card 4

#### Front

If we double the resultant force applied to an object, what happens to its acceleration?

### Card 5

#### Front

What force is needed to give an acceleration of 2 m/s2 to a 4 kg box?