When analyzed, most complicated machines are found to consist of a combination of various simple machines. Which machine below is NOT a simple machine?

Options

A. lever
B. electric motor
C. inclined plane
D. pulley.

Explanation

To solve the question of which machine is NOT a simple machine, we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Types of Machines**:
- There are two types of machines: simple machines and complex machines.
- Simple machines are basic mechanical devices that apply force and are based on fundamental principles.

2. **List the Simple Machines**:
- The six types of simple machines are:
- Lever
- Pulley
- Inclined Plane
- Screw
- Wedge
- Axle

3. **Analyze the Given Options**:
- **Option A: Lever** - This is a simple machine.
- **Option B: Electric Motor** - This is a complex machine as it consists of various components including electrical connections, windings, etc.
- **Option C: Inclined Plane** - This is a simple machine.
- **Option D: Pulley** - This is also a simple machine.

4. **Conclusion**:
- Among the options provided, the electric motor is the only one that does not qualify as a simple machine. It is a complex machine made up of various simple machines.

### Final Answer:
**Electric Motor** is NOT a simple machine.

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