Question
Tue February 26, 2008 By:

when we apply brakes in the car,it retards the motion;although it is an internal force.why?

Expert Reply
Thu February 28, 2008

When we apply brakes in the car, it retards the motion;although it is an internal force.why?

For the system of car + brakes + road on which it is moving, the application of brakes constitute extrenal forces hence the car retards.  

Home Work Help