Year 7 Revision speed

Question 1

What is the formula for speed calculations?

Answer 1

Speed=distance-:time

Question 2

What are the three units you use for speed?

Answer 2

Metres per second- m/s
Miles per hour- mph or miles/h
Kilometres per hour- km/h

Question 3

For example:
A hooligan sheep is skateboarding down a farmers track. You notice it takes exactly 5 seconds to move between two fence posts, 10 metres apart. What’s the sheeps speed?

Answer 3

Distance=10m and time=5secs
Speed=distance-:time
=10-:5= 2m/s

Question 4

A camper van sprints down the motor way and travels 15miles in 30 minutes. What’s its speed?

Answer 4

D=15
T=30
15-: 0.5= 30miles/ hour (mph)

Question 5

If two objects are moving towards each other on the same straight line what do you do?

Answer 5

To calculate there relative motion you add the speeds together

Question 6

If to cars are going the same way at different speeds what do you do?

Answer 6

You have to subtract the two speeds