2.  Gravity is a force. It pulls things down.
That way we don’t float up in the air.
Gravity also pulls things together.

3. Work is the ability to
push or pull. For instants
if I want to move this
bucket, I would have to
push or pull it so I’m
doing work.

4. Friction is a
complicated
thing. If you
have a
basketball and
it started to roll
it would have
to stop at
some point.
That what
Friction is. If
there was no
friction that
basketball
wouldn't stop
rolling.

5.  Simple machines make it easy to work.
For instants I need to put a nail into the
wall. Instead of pounding the nail into
the wall with my hand I can use a
hammer. You can find all sorts of simple
machines, I can’t even name them all.