#### 7. Kinetic Energy and Work Kinetic Energy

causing the ball to speed up. • energy transferred from an object is negative work, gravity performs negative work on a ball tossed up by transferring energy from the ball, causing the ball to slow down. • both kinetic energy and work are scalars. • unit: J Work Energy Theorem: The work done is equal to the change in the kinetic energy: ∆K = K f − K i = W In the above .