Which of the following is not an example of muscular force ?

Options

A. a porter carrying a load on a wheel- barrow
B. an apple falling from a tree
C. a child riding a bicycle
D. a person drawing water from a well

Answer

To determine which of the given options is not an example of muscular force, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Understand Muscular Force**: Muscular force is the force exerted by muscles when they contract. It is used to move objects or apply force through physical effort.

2. **Analyze Option A**:
- **Porter carrying a load on a wheelbarrow**: The porter uses his muscles to push the wheelbarrow forward. This involves exerting force through his muscles.
- **Conclusion**: This is an example of muscular force.

3. **Analyze Option B**:
- **An apple falling from a tree**: The apple falls due to gravitational force acting on it, not because of any muscular effort.
- **Conclusion**: This is NOT an example of muscular force.

4. **Analyze Option C**:
- **A child riding a bicycle**: The child uses their leg muscles to push the pedals, which propels the bicycle forward.
- **Conclusion**: This is an example of muscular force.

5. **Analyze Option D**:
- **A person drawing water from a well**: The person pulls on a rope or a bucket using their muscles to lift the water.
- **Conclusion**: This is also an example of muscular force.

6. **Final Conclusion**:
- The only option that does not represent muscular force is **Option B** (an apple falling from a tree).

### Final Answer:
**The correct option is B: An apple falling from a tree.**

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