# p2

p2 aqa

- Created by: rakhi
- Created on: 01-01-11 16:11

First 275 words of the document:

Forces and Motion:

Representing motion:

The slope on a distancetime graph represents the speed of an object. The velocity of an object

is its speed in a particular direction. The slope on a velocitytime graph represents the

acceleration of an object. The distance travelled is equal to the area under a velocitytime graph.

Speed, distance and time:

When an object moves in a straight line at a steady speed, you can calculate its speed if you know

how far it travels and how long it takes.

For example, a car travels 300 metres in 20 seconds.

Its speed is 300 ÷ 20 = 15m/s.

Distancetime graphs:

The vertical axis (yaxis) of a distancetime graph is the distance travelled from the start. The

horizontal axis (xaxis) is the time from the start. When an object is stationary, the line on the graph

is horizontal. When an object is moving at a steady speed, the line on the graph is straight, but

sloped.

The steeper the line, the greater the speed

of the object. The blue line is steeper than

the red line because it represents an object

moving faster than the one represented by

the red line. The red lines on the graph

represent a typical journey where an object

returns to the start again. Notice that the line

representing the return journey slopes

downwards.

Velocitytime graphs:

The velocity of an object is its speed in a

particular direction. This means that two cars

travelling at the same speed, but in opposite

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