# Kinetic Energy A moving object has energy because of its motion. This energy is called kinetic energy.

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Kinetic Energy A moving object has energy because of its motion. This energy is called kinetic energy.

Answer Me!!!  What must be done for potential energy to get changed into kinetic energy?

Work and Energy

Kinetic Energy  The net work done in accelerating an object from rest to some speed is equal to the kinetic energy (KE) of the object.

Practice Problem 1  What is the kinetic energy of a 980 kg race car traveling at 90 m/s?

Practice Problem 2  A 60 kg runner has 1920 J of kinetic energy. At what speed is he running?

Practice Problem 3  If the speed of a car is doubled, what will happen to the kinetic energy of the car?

Practice Problem 4  A cart of mass m traveling at speed v has kinetic energy KE. If the mass of the cart is doubled and its speed is halved, the kinetic energy of the cart will be _______.

Practice Problem 5  Draw the graph that represents the relationship between Kinetic Energy (KE) and velocity of an object (v). KE v

Answer Me!!!  A 2 kg cart is at rest on a level floor. Determine the kinetic energy of the cart after a force of 10 N is applied to the cart over a distance of 2 meters.

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