Answer:

1. A. Simple Machine. It reduces the efforts needed when working.

2. A. Lever. It is a curved rigid bar that is free to turn about a fixed point.

3. A. Effort. The distance from the fulcrum to the load is called the Effort.

4. C. A crowbar is an example of class 1 lever in which the fulcrum is between the effort and the load.

5. B, Effort. It is the force that is applied to a one part of a bar.