Give two examples of the motion of big objects where the object can be treated as a particle and where it cannot be?

Explanation

To answer the question, we need to identify two examples of big objects where they can be treated as particles and two examples where they cannot.

### Step-by-Step Solution:

1. **Understanding Particle Motion**:
- In physics, an object can be treated as a particle when its size is negligible compared to the distances it travels. This simplification allows us to apply the laws of motion without considering the object's shape or size.

2. **Examples of Big Objects Treated as Particles**:
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