I WONDER - What Is A Lever?

A lever is a simple machine consisting of a rigid bar that pivots around a fulcrum, providing mechanical advantage to lift heavy objects with less effort. Examples include seesaws and crowbars. Levers are categorized into three types based on the positions of the fulcrum, effort, and load. They are prevalent in everyday tools like scissors and pliers, and even in biological systems, such as the human arm, where the elbow acts as a fulcrum.

What is the main function of a lever?

• To reduce friction

• To lift heavier objects with less effort

• To change the direction of force

• To increase the speed of an object

Which of the following is an example of a lever?

• A seesaw

• A screw

• A wheel

• A pulley

How are levers categorized?

• By their size

• By the positions of the fulcrum, effort, and load

• By their color

• By their material

Which tool is an example of a lever?

• A hammer

• A screwdriver

• Scissors

• A wrench

In the human body, what acts as the fulcrum when lifting objects?

• The knee

• The wrist

• The elbow

• The shoulder