The magnitude of force is expressed in the unit of force called:

Options

A. Pascal
B. kelvin
C. Newton
D. magdeburg

Answer

To solve the question regarding the unit of force, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Force**:
- Force is defined as the interaction that changes the motion of an object. The formula for force is given by Newton's second law of motion:
\[ F = m \cdot a \]
where \( F \) is the force, \( m \) is the mass, and \( a \) is the acceleration.

2. **Identifying Units**:
- The SI unit of mass (m) is kilograms (kg).
- The SI unit of acceleration (a) is meters per second squared (m/s²).

3. **Calculating the Unit of Force**:
- By substituting the units of mass and acceleration into the force formula, we get:
\[ F = kg \cdot \left( \frac{m}{s^2} \right) = kg \cdot m/s^2 \]
- Therefore, the unit of force can be expressed as kilograms meters per second squared (kg·m/s²).

4. **Converting to Standard Unit**:
- In physics, the unit of force is commonly referred to as the Newton (N).
- Thus, 1 Newton is equivalent to 1 kg·m/s².

5. **Analyzing the Options**:
- Option 1: Pascal (Pa) - This is a unit of pressure (1 Pa = 1 N/m²).
- Option 2: Kelvin (K) - This is a unit of temperature.
- Option 3: Newton (N) - This is the correct unit of force.
- Option 4: Magdeburg - This is not a recognized unit of force.

6. **Conclusion**:
- Based on the analysis of the options, the correct answer is **Option 3: Newton**.