Which of the following is not an effect of force ?

Options

A. a force can change the speed of a moving object
B. a force can change the direction of a moving objective
C. a force can change the composition of a moving object.
D. a force can change the shape and size of an object.

Answer

To determine which of the following is not an effect of force, we will analyze each option provided.

1. **Identify the options**:
- Option A: A force can change the speed of a moving object.
- Option B: A force can change the direction of a moving object.
- Option C: A force can change the composition of a moving object.
- Option D: A force can change the shape and size of an object.

2. **Analyze each option**:
- **Option A**: A force can change the speed of a moving object.
- This is true. When a force is applied to an object, it can accelerate or decelerate it, thus changing its speed.

- **Option B**: A force can change the direction of a moving object.
- This is also true. Forces can cause an object to change its direction of motion, such as when a car turns a corner.

- **Option C**: A force can change the composition of a moving object.
- This statement is not true. While force can change the shape and size of an object, it does not change the composition of the object. For example, stretching a rubber band changes its shape but does not change what it is made of.

- **Option D**: A force can change the shape and size of an object.
- This is true. Applying a force can deform an object, changing its shape and size, such as when you squeeze a sponge.

3. **Conclusion**:
- Among the options, Option C is the only one that does not represent an effect of force. Therefore, the correct answer is that a force cannot change the composition of a moving object.

**Final Answer**: Option C: A force can change the composition of a moving object is not an effect of force.

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