Laws of dynamics
Answers are for parents and teachers.
1
What acceleration does a 4 kg body get under a 12 N force (m/s²)?
3
2
What net force acts on a 15 kg body with acceleration 2 m/s² (N)?
30
3
Two skaters of 80 kg and 40 kg push each other on ice. The lighter gets 4 m/s². What acceleration does the heavier get (m/s²)?
2
4
Under a force a 5 kg body reaches 8 m/s from rest in 4 s. What is the force (N)?
10
5
Why do standing passengers lean forward when a bus brakes sharply? Explain with the first law.
The bus slows down, while the passengers’ bodies tend to keep their earlier velocity because of inertia.