In the context of physics, a collision generally refers to an event where two or more bodies exert forces on each other for a relatively short period of time. Therefore, we can evaluate each example listed:
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A giraffe chewing a leaf: This involves the giraffe's mouth and teeth acting on the leaf, creating a localized interaction, but it is not typically classified as a collision.
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A dog scratching on the door: This involves the dog interacting with the door. If we consider the scratching as a forceful contact between the dog's claws and the door, it could be classified as a collision.
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A log burning: This is a chemical reaction (combustion) happening over time and does not involve physical contact with another object in the sense of a collision.
Based on this analysis, we can conclude:
- A dog scratching on the door is an example of a collision.
Thus, the answer to how many of the scenarios are examples of collisions is one.