Levers Simple Machines

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.

Front

What is the fulcrum in a lever?

Back

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

Front

What is mechanical advantage?

Back

Mechanical advantage is the ratio of the output force produced by a machine to the input force applied to it.

Front

What are the three classes of levers?

Back

The three classes of levers are: 1st class, 2nd class, and 3rd class, classified based on the position of the fulcrum, load, and effort.

Front

What is an example of a first-class lever?

Back

A seesaw is an example of a first-class lever.

Front

What is an example of a second-class lever?

Back

A wheelbarrow is an example of a second-class lever.

Front

What is an example of a third-class lever?

Back

A pair of tweezers is an example of a third-class lever.

Front

How do levers make work easier?

Back

Levers allow a smaller input force to lift a larger load by increasing the distance over which the force is applied.

Front

What is effort force?

Back

Effort force is the force that a person or machine applies to a lever to move a load.

Front

What is load in the context of levers?

Back

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