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P2: Work, Energy And Momentum


As physics is a hard topic, the specification of the exams has
been used to make notes on only the area we NEED to know. The
notes have been written in small sentence format for easier
learning.

Speed
The speed is how fast an object…

Page 2

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The slope of a velocity time graph represents acceleration

The area under a velocity time graph represents the distance
travelled

Equal and Opposite Forces
Whenever two objects push or pull on each other, they exert an
equal but opposite force on each other.

The unit of force is the newton…

Page 3

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When a vehicle travels at a steady speed the frictional forces
balance the driving force

Stopping Distance
The greater the speed of the vehicle the greater the braking force
needed to stop it in a certain distance

The stopping distance of the vehicle depends on the distance the
vehicle travels…

Page 4

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When a force causes a body to move through a distance, energy
is transferred and work is done

Work done = energy transferred

Work done (J) =force applied(N) X distance moved (m)

Work done against frictional forces is mainly transformed into heat

For an object that is able to recover…

Page 5

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Speed = the rate at which an object moves

Velocity = the speed at which an object moves in a particular
direction

Velocitytime graph = represents acceleration (velocity against
time taken)

Energy = the capacity of a physical system to do work measured
in Joules (J)

Force = a push…

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