Work Energy Problems With Friction

The work energy theorem states that the change in kinetic energy of an object is equal to the work done on that object but this equation is only valid for frictionless processes.

Work energy problems with friction.

So another way of thinking of this problem is energy initial is equal to or you could say the energy initial plus the negative work of friction right. The whole time friction is acting against the distance. The sum of that work must be equal to the change in the car s kinetic energy. The spring is compressed initially so it loses spring.

Determine the value of the work of the friction force between points a and b. A mass m 5 kg starts its motion at point a see figure at a height h a 2 m with a speed v a 20 m s. Both the engine and friction do work on the car. There is no friction or air resistance so wnc 0.

How much work is required to move it at constant speed a 3m along the floor against a friction force of 4n b 3m along a frictionless air table c 3m vertically. This physics video tutorial explains how to solve conservation of energy problems with friction inclined planes and springs. When it reaches point b see figure at a height h b 1 2m its speed is v b 10 m s. A 2kg crate rests on the floor.

Determine the work done by pete on the pitcher during the 48 cm push. Conservation of energy in which the sum of the initial kinetic and potential energies is equal to the sum of the final kinetic and potential energy is technically. Determine the work done by friction upon the pitcher. Determine the kinetic energy of the pitcher when pete is done pushing it.

The first problem asks you to c. A 2 kg object is being pushed by a horizontal force f along a horizontal frictionless air table. The work energy theorem states that the net amount of work done on an object is equal to the object s final kinetic energy minus its initial kinetic energy. So when the force is going in the opposite direction as the distance your work is negative.

The coefficient of friction between the pitcher and the counter top is 0 28.