Forces of action and reaction never cancel each other as they are

Options

A. always equal
B. always opposite
C. acting on same body
D. acting on different bodies

Answer

To understand why the forces of action and reaction never cancel each other, we can break down the explanation into a step-by-step solution.

### Step-by-Step Solution:

1. **Understanding Action and Reaction Forces**:
- According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. This means that if object A exerts a force on object B, then object B exerts a force of equal magnitude and opposite direction on object A.

2. **Identifying the Forces**:
- Consider a man standing on the ground. The man exerts a downward force on the ground due to his weight (action force). Simultaneously, the ground exerts an upward force on the man (reaction force).

3. **Different Bodies**:
- The key point is that the action and reaction forces act on two different bodies. The downward force (action) is on the ground, while the upward force (reaction) is on the man. Since they act on different objects, they do not cancel each other out.

4. **Example of Friction**:
- When the man tries to walk, he pushes backward against the ground (action). The ground pushes him forward (reaction). The friction between his feet and the ground allows him to move. Here again, the action and reaction forces are acting on different bodies (the man and the ground).

5. **Conclusion**:
- Since action and reaction forces act on different bodies, they cannot cancel each other. This is why the man can walk, as the frictional force between his feet and the ground allows for movement.

### Final Answer:
Forces of action and reaction never cancel each other as they act on different bodies.