# Work Kinetic Energy Theorem

1. Oct 21, 2015

### toesockshoe

$W_{total} = \delta K$

What about lifting a block upward? If you lift a 10kg block vertically and bring it to a rest, you are doing work on it but the velocity in the beg and the end is 0, thus the equation says the work done on it is 0. But isn't there potential energy? Does the equation not look at potential energy?

2. Oct 22, 2015

### ehild

It is the total work - yours and that of gravity - which adds up to zero. The change of the potential energy is the negative of the work done by the force of gravity, You did mgh work, the gravity did -mgh work, they add up zero if the KE(initial)=KE(final).