Forces (Stage 8)

Which of these speed calculations is correct?

• A car that travels 100 km in 2 hours has an average speed of 50 km/h

• A fish that swims 20 m in 5 seconds has an average speed of 5 m/s

• A rocket that that travels 100 km in 30 minutes has an average speed of 200 km/h

• A ball that rolls 2 m in 5 seconds has an average speed of 0.4 m/s

Which are the units of speed

• km

• m/s

• km/s

• h

• s

Which are units of distance?

• km

• m/s

• h

• s

• m

A girl is cycling at a steady speed. How can you tell from the graph that the speed is steady?

A girl is cycling at a steady speed. How fast is she travelling?

Choose the best definition of average speed

• How far you travel per second

• The total distance that you travel divided by the time for the journey

• How far you travel in one hour

• the total distance that you travel divided by the total time that it takes

Rafal went to visit his grandmother in an aeroplane, a distance of 1440km. The journey took 2 hours. How fast did the plane travel?

Rafal went to visit his grandmother in an aeroplane, a distance of 1440km. When the plane took off it had to speed up. What is the scientific word for speeding up?

Jameel was watching his favourite football team play at their stadium. He saw he striker run the length of the field, which is 110m or 0.11km, in 10 seconds. How fast did the striker run?

Jameel was watching his favourite football team play at their stadium. Jameel walked home, a distance of 3km in 30 minutes. How fast did he walk?