Speed and force
Answers are for parents and teachers.
1
A cyclist rides 90 km in 3 hours. Speed in km/h?
30
2
How many m/s is 54 km/h?
15
3
A car at 20 m/s covers how many metres in 30 s?
600
4
Find the force of gravity on a 12 kg body (g = 10 N/kg), in N.
120
5
Find three examples of types of force at home and write them down.
Sample: a book on a table — gravity; a door spring — elastic force; a chair slid on the floor — friction.