Choose the wrong statement.

Options

A. 1 kg wt=9.8N
B. Momentum is a vector quantity
C. Force is always conserved
D. Momentum is conserved in the absence of an external force

Answer

To solve the question of identifying the wrong statement among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Option 1**:
- The statement is: "Weight is equal to mass into gravitational acceleration."
- This is a correct statement. The formula for weight (W) is given by:
\[ W = m \cdot g \]
where \( m \) is mass and \( g \) is the gravitational acceleration (approximately \( 9.8 \, \text{m/s}^2 \) on Earth).

2. **Analyze Option 2**:
- The statement is: "Momentum is a vector quantity."
- This is also a correct statement. Momentum (p) is defined as:
\[ p = m \cdot v \]
where \( m \) is mass and \( v \) is velocity. Since velocity is a vector, momentum is also a vector quantity.

3. **Analyze Option 3**:
- The statement is: "Force is always conserved."
- This statement is incorrect. Forces are not conserved; rather, momentum is conserved in the absence of external forces. Therefore, this is the wrong statement.

4. **Analyze Option 4**:
- The statement is: "Momentum is conserved in the absence of an external force."
- This is a correct statement. According to the law of conservation of momentum, if no external forces act on a system, the total momentum of the system remains constant.

### Conclusion:
After analyzing all options, the wrong statement is **Option 3: "Force is always conserved."**

### Final Answer:
**Option 3 is the wrong statement.**

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