An inclined plane is a part of which other simple machine?

Options

A. lever
B. screw
C. pulley
D. wheel-and-axle

Explanation

To solve the question "An inclined plane is a part of which other simple machine?" we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of an Inclined Plane**:
- An inclined plane is a flat surface that is tilted at an angle to the horizontal. It is used to help lift heavy objects by allowing them to be raised gradually rather than lifting them straight up.

2. **Identify the Options Provided**:
- The options given are:
- Lever
- Screw
- Pulley
- Wheel and axle

3. **Analyze Each Option**:
- **Lever**: A lever is a rigid bar that pivots around a fixed point called the fulcrum. It does not directly incorporate an inclined plane.
- **Screw**: A screw is essentially an inclined plane that is wrapped around a cylinder. It uses the principle of an inclined plane to convert rotational motion into linear motion.
- **Pulley**: A pulley consists of a wheel on an axle or shaft that is designed to support movement and change the direction of force. It does not include an inclined plane.
- **Wheel and Axle**: This is a simple machine consisting of a wheel attached to a smaller axle, which allows for easier movement. It does not involve an inclined plane.

4. **Determine the Correct Answer**:
- Since the screw is defined as an inclined plane wrapped around a cylinder, it is clear that the inclined plane is a part of the screw. Therefore, the correct answer is **screw**.

### Final Answer:
An inclined plane is a part of the **screw**.

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