Simple Machines

2. There are __ basic simple machines.
3. An inclined plane helps us as it lets us ___ the object up instead of lifting it.
5. A lever is made of _ parts.
7. In a first-class lever the ___ is in the middle.
8. A screw is better then a ordinary ____ because the spiral threads grip wood or walls tightly and doesn't come of easily.
9. A screw is a modified __________.
10. Two inclined planes joined together back to back form a _____.

1. Two or more simple machines when put together form a ____ machine.
2. Anything with a ___ edge is actually a wedge.
4. Which class-lever is a wheelbarrow?
6. A ___ is a simple machine that uses grooved wheels and a rope to raise, lower or move a load.