# Unit 2

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Terminal Velocity
The resultant force and acceleration are zero-the object falls at a constant velocity
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Weight and Gravity
W = m x g: W=weight of objects, Newtons m=mass of object, kg g=gravitational field strength, N/kg
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Falling Objects
The resultant force acting on a falling object depends on its weight and the air resistance
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Stopping Distance
Stopping distance = braking distance + thinking distance
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Brakes
The brakes produce a frictional force between the brake and wheel. The kinetic energy of the vehicle is reduced. Energy is transferred to the brakes and the temperature of the brakes increases
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Braking forces and Distance
The greater the speed of the vehicle the greater the braking force needed to stop in a particular distance. For a constant braking force the braking distance increases with speed
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Acceleration
Acceleration is the rate of change of velocity. a = change in velocity ÷ time
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Acceleration on Velocity-Time graphs
Acceleration can be calculated from the gradient of a velocity-time graph
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Forces and Motion
The acceleration of an object can be calculated if you know its mass and the resultant force acting on it. a = F ÷ m
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Resultant Forces
Two or more forces acting on an object can be replaced by one force. This called the resultant force
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Calculating Resultant Forces
If two or more forces are acting in the same straight line or are parallel they can be added together to find the resultant force
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## Other cards in this set

### Card 2

#### Front

W = m x g: W=weight of objects, Newtons m=mass of object, kg g=gravitational field strength, N/kg

#### Back

Weight and Gravity

### Card 3

#### Front

The resultant force acting on a falling object depends on its weight and the air resistance

### Card 4

#### Front

Stopping distance = braking distance + thinking distance

### Card 5

#### Front

The brakes produce a frictional force between the brake and wheel. The kinetic energy of the vehicle is reduced. Energy is transferred to the brakes and the temperature of the brakes increases