200
________ help to control an aeroplane during flight.
A _____ is a simple machine that can increase the size of a force, or increase the distance the force moves.
A pendulum is a weight suspended from a _____ so that it can swing freely.
When you push down on one side you are applying an ______ and the object on the other end, the load , moves up.
Most levers work by changing a small force into a larger one. The leaver acts as a force __________.
The ______ muscle pulls on the radius bone and moves it a little way.
The ______ bone acts as a lever.
___________ energy can be carried on without wasting things or harming the natural world.