To determine whether any of the listed examples represent collisions, we need to think about the physical interactions that involve the contact or impact between two objects.
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A giraffe chewing a leaf involves the giraffe's mouth (teeth) coming into contact with the leaf, which can be considered a form of collision, as there is a direct interaction between the giraffe and the leaf.
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A dog scratching on the door involves the dog's claws interacting with the surface of the door, which again can be viewed as a collision since there is contact and force applied by the dog on the door.
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A log burning does not involve a collision in the typical sense. While there may be chemical reactions occurring, there isn't a direct contact or impact between two solid objects.
Now let's analyze the responses:
- A giraffe chewing a leaf. (Collision)
- A dog scratching on the door. (Collision)
- A log burning. (Not a collision)
Given that the first two examples (giraffe chewing a leaf and dog scratching on the door) involve collisions, while the log burning does not, we conclude that there are two examples of collisions.
Therefore, the answer is that there are two examples of collisions.
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