# Mechanics

Everything for the mechanics section of the edexcel spec

- Created by: Aaron Smith
- Created on: 04-01-12 06:39

First 254 words of the document:

Physics Paper 1 (Mechanics)

speed = distance

time

However, this formula only gives the average speed over time and does not take into account any times when a lower or higher speed. For this reason, motion is represented on a graph. They are represented as

displacement/time, velocity/times, acceleration/time where each is the integral of the next.

Displacement/time graph:

S Y axis value

U Gradient of y intercept

V Gradient of the line

A Second differential

T X axis value

Velocity/time graph

S Area under the graph

U Y intercept

V Y axis value

A Gradient

T X axis value

Acceleration time graph

S Second integral

U First integral at y intercept.

V Area under the graph

A Y axis value

T X axis value

Scalar quantities show a magnitude of a measurement only. Vector quantities show the magnitude and the direction in which they are being applied e.g. 3 ms1 north. Therefore acceleration can be a change in

direction, and not only its speed.

THE EQUATIONS OF MOTION:

a = v-u

t

1 (u + v )t

s= 2

1 at2

s = ut + 2

v2 = u2 + 2as

Vectors can be used to represent movement that is not consisting of one straight line. Two vectors can be joined tail to tip to find their resultant. The length of this is the overall magnitude.

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