Simple Machines

Front

What is a lever?

Back

A simple machine that consists of a rigid bar that pivots around a fixed point called the fulcrum.

Front

What are the three classes of levers?

Back

1. First Class: Fulcrum in the middle (e.g., seesaw). 2. Second Class: Load in the middle (e.g., wheelbarrow). 3. Third Class: Effort in the middle (e.g., tweezers).

Front

What is a fulcrum?

Back

The pivot point around which a lever rotates.

Front

What is the difference between a fixed pulley and a moveable pulley?

Back

A fixed pulley does not move with the load, while a moveable pulley moves with the load.

Front

What is an example of a first-class lever?

Back

A seesaw or a pair of scissors.

Front

What is an example of a second-class lever?

Back

A wheelbarrow or a nutcracker.

Front

What is an example of a third-class lever?

Back

Tweezers or a fishing rod.

Front

What is a wheel?

Back

A circular object that rotates around an axle, allowing for easier movement of loads.

Front

What are rollers?

Back

Cylindrical shapes placed under an object to allow it to roll across a surface.

Front

What is the mechanical advantage of using a pulley system?

Back

It allows a smaller effort to lift a larger load by distributing the weight.