Question

Differentiate between all the classes of a lever with an example.

Answer 1

Explanation:

Solution

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Class I

Class II Class III

1. It has the fulcrum between the load and effort. It has the load between the fulcrum and effort.

It has the effort between fulcrum and load.

The effort arm can be shorter, equal to or longer than the load arm. The effort arm is bigger than the load arm. The effort arm is always shorter than the load arm.

The mechanical arm can be shorter, equal to or longer than the load arm. The mechanical advantage is always greater than 1. The mechanical advantage is always less than 1.

The load and effort both are in the same direction. The load and effort are in the opposite directions. The load and effort are in opposite directions.

Answer 2

Class I

1.  It has the fulcrum between the load and effort.
2. The effort arm can be shorter, equal to or longer than the load arm.
3. The mechanical arm can be shorter, equal to or longer than the load arm.
4. The load and effort both are in the same direction.

Class II

1. It has the load between the fulcrum and effort.
2. The effort arm is bigger than the load arm
3. The mechanical advantage is always greater than 1.
4. The load and effort are in the opposite directions

Class III

1. It has the effort between fulcrum and load.
2. The effort arm is always shorter than the load arm.
3. The mechanical advantage is always less than 1.
4. The load and effort are in opposite directions

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