# Forces

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What are the forces like when two objects interact?
Equal and opposite
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What is the resultant force?
A single force that can replace all forces and have the same effect as all original forces acting together
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What may a resultant force acting on an object cause?
To change its state of rest or motion
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What will happen to a stationary object if the RF is zero?
It will remain stationary
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What will happen to a stationary object if the RF is not zero?
It will accelerate in direction of resultant force
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What will happen to a moving object if the RF is zero?
It will continue to move at same speed and same direction
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What will happen to a moving object if the RF is not zero?
It will accelerate in direction of resultant force
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What is the equation for working out RF? Explain.
F = m x a - F= resultant force (N) - m= mass (kg) - a= acceleration (m/s²)
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What does the gradient on a distance-time graph represent?
Speed
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What is the equation for working out acceleration? Explain.
a = v - u / t - a= acceleration (m/s²) - v= final velocity (m/s) - u= inital velocity (m/s) - t- time (s)
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What does gradient represent on a velocity-time graph?
Acceleration
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What do the forces balance when a vehicle travels at a steady speed?
Resistive forces balance the driving force
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What is the stopping distance the sum of?
Reaction time and the braking force
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What can a driver's reaction time be affected by?
Tirdness, drugs and alcohol
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What happens when the brakes of a vehicle are applied?
Work done by the friction force between the brakes and the wheel reduces kinetic energy and the temperature of the brakes increases.
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What can a vehicle's braking distance be affected by?
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## Other cards in this set

### Card 2

#### Front

What is the resultant force?

#### Back

A single force that can replace all forces and have the same effect as all original forces acting together

### Card 3

#### Front

What may a resultant force acting on an object cause?

### Card 4

#### Front

What will happen to a stationary object if the RF is zero?

### Card 5

#### Front

What will happen to a stationary object if the RF is not zero?