Classes of 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: 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 effort and the load. Examples include a seesaw and scissors.

Front

What is a 2nd class lever?

Back

A 2nd class lever has the load located between the fulcrum and the effort. An example is a wheelbarrow.

Front

What is a 3rd class lever?

Back

A 3rd class lever has the effort located between the fulcrum and the load. An example is a fishing rod.

Front

What is the fulcrum in a lever system?

Back

The fulcrum is the fixed point around which the lever pivots.

Front

What is the effort in a lever system?

Back

The effort is the force applied to the lever to move the load.

Front

What is the load in a lever system?

Back

The load is the weight or resistance that is being moved or lifted by the lever.

Front

How does a seesaw function as a 1st class lever?

Back

In a seesaw, the fulcrum is in the middle, allowing one side to go up when the other side goes down, demonstrating the balance of forces.

Front

What is an example of a 2nd class lever?

Back

A wheelbarrow is an example of a 2nd class lever, where the load is between the effort and the fulcrum.