# Mechanics AS Physics.

These are the key points for the mechanics unit of AS physics

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## Pages in this set

### Page 1

Mechanics.

Scalars and vectors.
1. A scalar has only magnitude. Examples include mass, temperature, time, length, speed
and energy.
2. Vector quantities have both magnitude and direction. Examples include displacement,
force, velocity, acceleration and momentum.

To add vectors, calculate resultant forces or calculate resultant velocities you use Pythagoras
theorem and…

### Page 2

Velocity time graphs.
The gradient of a velocity time graph tells you the acceleration.
The area under a speed time graph tells you the distance travelled.

Constant acceleration is shown by a straight line.
Decreasing acceleration if shown by a curve decreasing in gradient.
Increasing acceleration is shown by a…

### Page 3

Work done is equal to the force causing motion times the distance moved. Work done is
measured in joules.

Power equals work done divided by time. Power is measured in Watts.
Power is also equal to force times velocity.

Conservation of energy principle is that energy can not be created…

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