# mechanics one revision notes

- Created by: sebastian parsons
- Created on: 13-05-13 20:23

First 183 words of the document:

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Mechanics 1 Revision notes

1. Kinematics in one and two dimensions

EQUATIONS FOR CONSTANT ACCELERATION ARE NOT GIVEN Learn Them!

1 2 1 2

v = u + at s = ut + at s = vt at

2 2

1 2 2 s : displacement (m)

s = (u + v)t v = u + 2as u : initial velocity (ms-1)

2

v : final velocity (ms-1)

a : acceleration (ms2)

t : time (s)

· Always list the variables you have - write down the equation you intend to use.

· Sketch graphs essential for multi-stage journeys

· Retardation / deceleration don't forget the negative sign

Distance/ Displacement time graph

GRADIENT = VELOCITY

Straight line constant velocity zero acceleration

Travels 12m from a point X, turns round

and travels 15 m in the opposite direction

finishing 3m behind X.

X

MOST USEFUL GRAPH TO SKETCH

Velocity Time graph

GRADIENT = ACCELERATION

Straight line constant acceleration Displacement

moving forwards

Displacement moving

DISPLACEMENT is represented backwards

by the area under the graph

Changed direction

after 18 seconds

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