MOVEMENT AND CHANGE

- a PHYSICS module

SPEED

SPEED

Defined as – distance travelled in a certain time

s = d / t

Distance usually measured in metres; time in seconds; speed in metres per second

SPEED

m / s

or in science more usually expressed as

m s-1

SPEED

Tells us nothing about the direction travelled in

Is usually an “average” value (unless measured and recorded every second!)

A journey – as a table

Time (mins) Distance travelled (km)

016710162225

02202048606028

A Journey

Present this journey as a distance time graph Q1 What assumptions have you made in

plotting this graph? Q2 Describe the journey depicted on the

graph with explanations of what happened in each part.

A Journey

Q4 Use the gradient method to calculate the speed from 22 minutes to 25 minutes.

Q5 Use the gradient method to calculate the speed from 10 minutes until 16 minutes.

Speed vs Velocity

Read p125 of the PHYSICS text. Write a note to define and explain what

VELOCITY is and how it has a different meaning to speed.