A car of mass travelling at is brought to rest by a uniform braking force in
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A car of mass 1000kg travelling at 30ms−1 is brought to rest by a uniform braking force in 5.0s. A truck of mass 5000kg undergoes the same change in momentum but is brought to rest uniformly in 20s.
(i) Calculate the magnitude of the average braking force acting on the car.
(ii) Calculate the magnitude of the average braking force acting on the truck.
(iii) Comment on the numerical difference between the two forces in the light of the time taken to stop each vehicle.