Kinetic energy and Potential energy - What is it? How is Kinetic energy associated with the motion of any given object? For example, the motion of a roller-coaster thrills it’s rider as they twist around corners, fly down hills and even wind up topsy-turvy as they pass through endless loops of track. You may have noticed that roller coaster cars are pulled up the first hill by a chain and motor, but once they reach the top, the cars roll through the remainder of the ride without any help from outside forces. It’s easy to imagine that gravity pulls the cars down the hill, but how do they get up the next hill or through the loops? The answer is in the energy of the cars as they roll through the ride.
Kinetic energy is nothing but the energy associated with the motion of an object. Work is energy transferred to an object or from an object as the result of the action of an external force. Positive work transfers energy to the object, and negative work transfers energy from the object. Work is the scalar product of the force vector and the displacement vector.
The change in kinetic energy due to applied forces is equal to the work done by the forces. Power is the rate at which work is done. The power provided by a force acting on an object is the scalar product of the velocity vector for that object and the force vector.
Learn about all these in this video module.
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