P-2 Lever Classes

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, used to lift or move loads.

Front

What are the three classes of levers?

Back

The three classes of levers are: 1st class lever, 2nd class lever, and 3rd class lever.

Front

What is a 1st class lever?

Back

A 1st class lever has the fulcrum located between the load and the effort. Example: Seesaw.

Front

What is a 2nd class lever?

Back

A 2nd class lever has the load located between the fulcrum and the effort. Example: Wheelbarrow.

Front

What is a 3rd class lever?

Back

A 3rd class lever has the effort located between the fulcrum and the load. Example: Tweezers.

Front

Identify a real-life example of a 2nd class lever.

Back

A wheelbarrow is a common example of a 2nd class lever.

Front

In a 1st class lever, where is the fulcrum located?

Back

The fulcrum is located between the load and the effort.

Front

What is the function of a fulcrum in a lever?

Back

The fulcrum acts as the pivot point around which the lever rotates.

Front

How does a 2nd class lever make work easier?

Back

A 2nd class lever allows a smaller effort to lift a larger load by increasing the distance over which the effort is applied.

Front

What is the mechanical advantage of a lever?

Back

The mechanical advantage is the ratio of the load force to the effort force, indicating how much a lever amplifies the input force.