Newton’s third law and circular motion
Answers are for parents and teachers.
1
Give two everyday examples of Newton’s third law.
For example: the ground pushes us when we jump; swimmers push water back and the water pushes them forward.
2
m = 4 kg, υ = 5 m/s, R = 10 m. Centripetal force (N)?
10
3
m = 2 kg, ω = 3 rad/s, R = 1 m. F = mω²R (N)?
18
4
Why should you hold a handrail when a bus turns?
By inertia your body tends to go straight while a centripetal force toward the turn is needed.
5
Is the centripetal force a new kind of force?
No, it is the resultant of existing forces (tension, friction, gravity) directed to the centre.