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

Back

Preview of the back of card 3

Card 4

Front

Stopping distance = braking distance + thinking distance

Back

Preview of the back of card 4

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

Back

Preview of the back of card 5
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