Work Energy Problems With Friction

The problem involves a change in height and speed and has a spring so we apply the generalized work energy theorem wnc δe.

Work energy problems with friction.

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. Work and work energy theorem. 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. When it reaches point b see figure at a height h b 1 2m its speed is v b 10 m s.

Determine the work done by friction upon the pitcher. 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 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. There is no friction or air resistance so wnc 0.

Both the engine and friction do work on the car. 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. 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. The whole time friction is acting against the distance.

Determine the total work done upon the pitcher. This physics video tutorial explains how to solve conservation of energy problems with friction inclined planes and springs. A 2 kg object is being pushed by a horizontal force f along a horizontal frictionless air table. Determine the work done by pete on the pitcher during the 48 cm push.

The sum of that work must be equal to the change in the car s kinetic energy. So when the force is going in the opposite direction as the distance your work is negative. The spring is compressed initially so it loses spring. The first problem asks you to c.

Determine the value of the work of the friction force between points a and b.