## anonymous 4 years ago 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.

1. anonymous

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

2. anonymous

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

3. anonymous

do W=Fd

4. anonymous

what about having the kinetic energy?

5. anonymous

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

6. anonymous

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