Answers

1. There are three classes of lever. First class, second class, and third class.

2. If the effort arm is longer than the load arm then the mechanical advantage is more than 1.

3. The class of lever where the mechanical advantage is always less than one is the third class of lever.

4. The mechanical advantage of that lever is less than 1.

5. Wheelbarrow

6. Stapler (assuming you apply force on the center of the stapler and not on the end).

7. The tip of the fulcrum.

8. This is because there is a smaller area that is affected by friction on a lever than on an inclined plane.

alex t answers

Answers