Motion, force and simple machines
Answers are for parents and teachers.
1
A motorcycle travelled 100 km in 2 hours. What is its average speed in km/h?
50
2
About how many N does a 12 kg load weigh? (g ≈ 10 N/kg)
120
3
Find three simple machines at home (scissors, door, can opener, etc.) and write which type each is.
For example scissors – lever, claw hammer – lever, knife – wedge.
4
Why is a long gentle road easier than a steep one? Explain.
On an inclined plane a longer path needs less force: we lose in distance and gain in force.