MACHINES 2 - Complex Machines worksheet - Free Printable

Problem Overview:

The task involves understanding the concepts of machines, simple machines, and complex machines. The worksheet provides a series of questions to test this understanding, along with an image-based question to identify simple machines.

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Solution:

#### 1.1. What is a machine?
A machine is a device that helps make work easier by changing the size or direction of a force. Machines can also increase the speed or distance over which a force is applied.

- Answer: A machine is a device that helps make work easier by changing the size or direction of a force.

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#### 1.2. What is a simple machine?
A simple machine is a basic mechanical device that changes the magnitude or direction of a force. Simple machines are the building blocks of more complex machines. They do not have any moving parts except for one part that moves relative to another.

- Answer: A simple machine is a basic mechanical device that changes the magnitude or direction of a force.

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#### 1.3. Tick the simple machines.
To identify simple machines, we need to recall the six types of simple machines:
1. Lever (e.g., bottle opener)
2. Pulley (not shown in the image)
3. Inclined plane (not shown in the image)
4. Wedge (not shown in the image)
5. Screw (e.g., screwdriver)
6. Wheel and axle (e.g., hammer, bicycle, pliers)

Now, let's analyze each item:

- Hammer: Uses a lever principle (handle and head).
- Washing machine: Not a simple machine; it is a complex machine.
- Screwdriver: Uses a screw mechanism.
- Bicycle: Uses wheels and axles but is too complex to be a simple machine.
- Pliers: Uses a lever principle.
- Electric screwdriver: Not a simple machine; it is powered by electricity.
- Bottle opener: Uses a lever principle.
- Helicopter: Not a simple machine; it is a complex machine.
- Pencil sharpener: Uses a wheel and axle or inclined plane but is too complex to be a simple machine.
- Watch: Not a simple machine; it is a complex machine.

Simple machines identified:
- Hammer
- Screwdriver
- Pliers
- Bottle opener

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#### 1.4. What is a complex machine?
A complex machine is a combination of two or more simple machines working together to perform a task. Complex machines are designed to accomplish more intricate tasks than simple machines alone.

- Answer: A complex machine is a combination of two or more simple machines working together to perform a task.

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Final Answers:

1.1. A machine is a device that helps make work easier by changing the size or direction of a force.
1.2. A simple machine is a basic mechanical device that changes the magnitude or direction of a force.
1.3. Simple machines: Hammer, Screwdriver, Pliers, Bottle opener.
1.4. A complex machine is a combination of two or more simple machines working together to perform a task.

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Boxed Final Answer:

\[
\boxed{
\begin{aligned}
1.1. & \text{ A device that helps make work easier by changing the size or direction of a force.} \\
1.2. & \text{ A basic mechanical device that changes the magnitude or direction of a force.} \\
1.3. & \text{ Hammer, Screwdriver, Pliers, Bottle opener.} \\
1.4. & \text{ A combination of two or more simple machines working together to perform a task.}
\end{aligned}
}
\]