Lesson 2 Objective

At the end of this section, you should be able to:

• list different simple machines used at home;
• write the purpose of the listed simple machines.
• categorize simple machines at home and workplace according to their type.

Brainstorming Question

What type of simple machines do you use in your home?

key terms and concepts

• Simple (compound) machines are said to be force multipliers when they enable us to lift big load by applying small effort. Load is greater than effort.
• Simple (compound) machines are said to be distance multipliers when they enable people to lift a load through a large distance by moving the effort through a small distance.

Simple Machines at home

Simple machines are commonly found in everyday household items, making tasks easier. Examples include:

• Levers: Scissors (first-class lever), nutcrackers (second-class lever), and tweezers (third-class lever).
• Inclined Planes: Ramps used for moving heavy objects like furniture.
• Wedges: Kitchen knives and axes for cutting.
• Screws: Jar lids and screws used in furniture assembly.
• Wheel & Axle: Rolling pins and doorknobs for easier rotation and movement.
• Pulleys: Blinds and curtains that can be raised or lowered.

Simple Machines at Work Place

In workplaces, simple machines are used to enhance efficiency and reduce physical effort. Examples include:

• Levers: Crowbars and hand trucks for lifting and moving heavy objects.
• Inclined Planes: Ramps for loading docks and moving equipment.
• Wedges: Chisels and wedges used in construction and manufacturing.
• Screws: Bolts and screws for assembly in construction or manufacturing processes.
• Wheel & Axle: Wheels on carts and trolleys for transporting goods.
• Pulleys: Hoists and cranes used to lift heavy materials in construction or warehouses.