Simple Machines

2. A flat surface that is higher at one end. Ramps can help lift heavy objects.
9. A rod at the center of a wheel or pulley. The wheel spins around the axle.
10. Type of simple machine. A lever has a long beam that rests on a point called a pivot.
12. Something that happens suddenly. It is often dangerous.
13. A machine that is made up of smaller machines. It can have several different simple machines.
16. The rubbing of one object against another.
17. A simple machine with angled sides. Wedges can split things apart.
18. Grooves and ridges that go around a screw

1. What something is made of. Metal, glass, and wood are materials.
3. A simple machine. It has a wheel with a rope running over it. Pulleys can help lift heavy objects.
4. The point that a lever moves around.
5. The force that pushes on a lever
6. The object that a lever tries to move.
7. A machine that uses a screw to push a weight down. Presses can be used to crush things.
8. A push or a pull.
11. The ability to do work. We use energy to lift or move things.
14. Something that helps us do work.
15. Slanted.