Choose the correct option for each question. There is only one correct response for each question.
When does an applied force cause motion in an object?

Options

A. When it exceeds the gravitational force
B. When it exceeds muscular force
C. When it exceeds rolling friction
D. When it exceeds static friction

Answer

To determine when an applied force causes motion in an object, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Forces**:
- An object at rest experiences forces acting on it, including static friction, which prevents it from moving.

2. **Applied Force**:
- When a force is applied to an object, it may or may not cause the object to move depending on the magnitude of that force relative to the forces acting against it.

3. **Static Friction**:
- Static friction is the force that keeps an object at rest. It must be overcome for the object to start moving.

4. **Threshold of Motion**:
- When the applied force is equal to or less than the static friction, the object remains stationary.
- As the applied force increases, there comes a point where it exceeds the static friction.

5. **Condition for Motion**:
- Once the applied force exceeds the maximum static friction, the object will begin to move. This is the critical point at which motion occurs.

6. **Conclusion**:
- Therefore, the correct answer to the question is that an applied force causes motion in an object when it exceeds the value of static friction.

### Final Answer:
The correct option is: **When the applied force exceeds the value of static friction.**

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