If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?
A horizontal force of 200 N is applied to a 55-kg cart across a 10-m level surface.If the cart accelerates at 2.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart?
A satellite is held in orbit by a 2 000-N gravitational force.Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:
I use a rope 2.00 m long to swing a 10.0-kg weight around my head.The tension in the rope is 20.0 N.In half a revolution how much work is done by the rope on the weight?
A worker pushes a sled with a force of 40 N over a level distance of 6.0 m.If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?
A 7.00-kg bowling ball falls from a 2.00-m shelf.Just before hitting the floor, what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)