Levers

Front

What is a lever?

Back

A lever is a simple machine that consists of a rigid bar that pivots around a fixed point called the fulcrum. It is used to lift or move loads with less effort.

Front

What are the three classes of levers?

Back

The three classes of levers are: 1) First-class lever (fulcrum in the middle), 2) Second-class lever (load in the middle), 3) Third-class lever (effort in the middle).

Front

What is the formula for calculating the Ideal Mechanical Advantage (IMA) of a lever?

Back

IMA = Length of effort arm / Length of load arm.

Front

What is the IMA of a first-class lever?

Back

The IMA of a first-class lever can vary depending on the position of the fulcrum, effort, and load.

Front

What is the IMA of a second-class lever?

Back

The IMA of a second-class lever is always greater than 1, as the effort arm is longer than the load arm.

Front

What is the IMA of a third-class lever?

Back

The IMA of a third-class lever is always less than 1, as the load arm is longer than the effort arm.

Front

Give an example of a first-class lever.

Back

A seesaw is an example of a first-class lever, where the fulcrum is in the center.

Front

Give an example of a second-class lever.

Back

A wheelbarrow is an example of a second-class lever, where the load is between the effort and the fulcrum.

Front

Give an example of a third-class lever.

Back

A pair of tweezers is an example of a third-class lever, where the effort is applied between the load and the fulcrum.

Front

What is the relationship between IMA and mechanical advantage?

Back

IMA represents the ideal mechanical advantage, which is the maximum possible advantage without considering friction or other losses.