Identify the type of force that is different from the other three

Options

A. Frictional force
B. Magnetic force
C. Gravitational force
D. Electrostatic force

Answer

To identify the type of force that is different from the other three, we will analyze the characteristics of each force mentioned: frictional force, magnetic force, gravitational force, and electrostatic force.

### Step-by-Step Solution:

1. **Understanding Frictional Force**:
- Frictional force acts when two surfaces are in contact. It opposes the motion of an object.
- **Key Point**: Friction requires contact between surfaces.

2. **Understanding Magnetic Force**:
- Magnetic force can act at a distance and does not require physical contact between objects.
- **Key Point**: Magnetic force can exert influence without contact.

3. **Understanding Gravitational Force**:
- Gravitational force also acts at a distance and does not require contact. It pulls objects towards each other based on their masses.
- **Key Point**: Gravitational force operates over a distance.

4. **Understanding Electrostatic Force**:
- Electrostatic force, like magnetic and gravitational forces, can act at a distance. It occurs between charged objects without the need for contact.
- **Key Point**: Electrostatic force can exert influence without contact.

5. **Comparison of Forces**:
- Now that we have analyzed all four forces, we can summarize:
- **Frictional Force**: Requires contact.
- **Magnetic Force**: Does not require contact.
- **Gravitational Force**: Does not require contact.
- **Electrostatic Force**: Does not require contact.

6. **Conclusion**:
- The force that is different from the other three is the **Frictional Force**, as it is the only force that requires contact between surfaces to act.