Simple Machines / Classes of Levers

Front

What is a simple machine?

Back

A simple machine is a device that changes the direction or magnitude of a force, making work easier. Examples include levers, pulleys, and inclined planes.

Front

What are the six types of simple machines?

Back

The six types of simple machines are lever, pulley, inclined plane, wedge, screw, and wheel and axle.

Front

What is a lever?

Back

A lever is a rigid bar that rotates 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 (fulcrum between effort and load), 2nd class (load between fulcrum and effort), and 3rd class (effort between fulcrum and load).

Front

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

Back

IMA = distance from fulcrum to effort / distance from fulcrum to load.

Front

What is the IMA of a first class lever?

Back

The IMA of a first class lever can be less than, equal to, or greater than 1, depending on the distances from the fulcrum.

Front

Which class of lever is most efficient for lifting heavy loads with less effort?

Back

The 2nd class lever is most efficient for lifting heavy loads with less effort.

Front

What is the role of the fulcrum in a lever?

Back

The fulcrum is the pivot point around which the lever rotates, allowing the lever to lift or move loads.

Front

How does increasing the distance from the fulcrum to the effort affect the IMA?

Back

Increasing the distance from the fulcrum to the effort increases the IMA, making it easier to lift a load.

Front

What is an example of a 1st class lever?

Back

An example of a 1st class lever is a seesaw or a crowbar.