Use the correct word to fill the blanks :
(Ramp, Simple machines, Work, Energy, Pulley)
1. ___________ is said to be done when a force is acting on it.
2. The ability to do work is __________.
3. ___________ is a machine made up of wheel and rope.
4. ____________ help us to make work easier.
5. An example for inclined plane is ____________.