A pulling force of 150n is exerted on a car to move it horizontally by 5m. A friction force opposes the motion of the car.

Question

anonymous · Answer

A- calculate the work done by the pulling force
B- calculate the work done by the friction force if the car gains 500J of KE
c- calculate friction force

anonymous · Answer

d- does the work done by the friction force get larger or smaller if the distance the car is moved by it increased

anonymous · Answer

do W=Fd

anonymous · Answer

what about having the kinetic energy?

anonymous · Answer

$$W = F \cdot d = \Delta KE + \Delta PE$$

anonymous · Answer

a) use W=force times diplacement
b) use work kinetic energy theorem i.e work done by all forces = change in kinetic energy.
c) once u get work done by friction force, use the same eqn W=Fd