Classify machines and their power sources in this educational worksheet.

Let's solve the worksheet step by step.

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Worksheet 1

#### 1. Classify the different types of machines into Simple Machines and Complex Machines

Definitions:
- Simple Machines: Basic mechanical devices that change the direction or magnitude of a force. There are six classical simple machines: lever, wheel and axle, pulley, inclined plane, wedge, and screw.
- Complex Machines: Machines made up of two or more simple machines working together.

Now let’s analyze each item:

| Item | Type | Reason |
|------|------|--------|
| Hammer | Simple Machine | A hammer is a type of lever (specifically a class 1 lever). It uses a pivot point (fulcrum) to apply force. |
| Vacuum cleaner | Complex Machine | Uses electric motor, fan, hose, and filters — multiple parts working together. |
| Wheel | Simple Machine | The wheel and axle is one of the six basic simple machines. |
| Television | Complex Machine | Contains electronic circuits, screen, power supply — not a single simple machine. |
| See-saw | Simple Machine | A classic example of a lever (class 1 lever), with a fulcrum in the middle. |
| Computer | Complex Machine | Made of many components like CPU, monitor, keyboard, etc., all powered by electricity. |
| Car | Complex Machine | Combines engine (burning fuel), wheels, gears, brakes, etc. — a system of many simple machines. |
| Screw | Simple Machine | A screw is an inclined plane wrapped around a cylinder — one of the six simple machines. |

✔ Classification:

| Simple Machines | Complex Machines |
|---------------------|----------------------|
| Hammer | Vacuum cleaner |
| Wheel | Television |
| See-saw | Computer |
| Screw | Car |

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#### 2. Classify them into their power source

Now we classify based on how they are powered:

- Human energy: Powered directly by human muscles (e.g., pushing, pulling).
- Electricity: Runs on electrical power (plugged in or battery).
- Burning fuel: Powered by combustion of fuel (like gasoline, diesel, etc.).

Let’s go through each:

| Item | Power Source | Reason |
|------|--------------|--------|
| Hammer | Human energy | Requires manual force to use. |
| Vacuum cleaner | Electricity | Plugs into an outlet or runs on battery. |
| Wheel | Human energy | Typically used manually (e.g., rolling by hand). |
| Television | Electricity | Needs electrical power to function. |
| See-saw | Human energy | People push themselves up and down. |
| Computer | Electricity | Requires electricity to run. |
| Car | Burning fuel | Most cars burn gasoline/diesel; some electric, but assuming conventional here. |
| Screw | Human energy | Driven by a screwdriver using hand force. |

✔ Classification by Power Source:

| Human energy | Electricity | Burning fuel |
|------------------|------------------|------------------|
| Hammer | Vacuum cleaner | Car |
| Wheel | Television | |
| See-saw | Computer | |
| Screw | | |

> Note: If the car were electric, it would go under "Electricity," but since it's not specified, we assume it's a traditional internal combustion engine.

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✔ Final Answer:

#### 1. Classification of Machines

| Simple Machines | Complex Machines |
|---------------------|----------------------|
| Hammer | Vacuum cleaner |
| Wheel | Television |
| See-saw | Computer |
| Screw | Car |

#### 2. Classification by Power Source

| Human energy | Electricity | Burning fuel |
|------------------|------------------|------------------|
| Hammer | Vacuum cleaner | Car |
| Wheel | Television | |
| See-saw | Computer | |
| Screw | | |

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This completes the worksheet! Let me know if you'd like this formatted as a printable answer sheet.