4. Work
• Work is the ability to push or pull, so whenever
you push or pull you are doing work.
5. Simple Machines
• Simple machines make work easier. There are
many simple machines around you. The names
of the simple machines are wedge, pulley,
screw, inclined plane, lever, and a wheel and
axle.
6. Friction
• An example of friction would be if something
round fell say off of a table it would roll but
after a little while it would stop because of
friction.
