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Work, Energy and Power
Question
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Is it possible that a collision may take place without physical contact between two bodies?

Answer

Yes, the collision may take place even without physical contact.
For example, if two protons are shot towards each other, they exert a force on each other without making any physical contact (because electrostatic force is acting at a distance). Hence, collision is said to take place.

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Some More Questions From Work, Energy and Power Chapter

Define the unit joule.

What are different units of energy?

What is watt?

Define watt.

How many joules are there in one eV?

What is the relation between kWh and Joule?

Does the body at rest possess energy?

By eating two apples, a person starts pushing the wall of room. If food value of apple is 100 calories per apple, how much work he will do in pushing the wall in one hour?

A man is rowing upstream and is at rest w.r.t. shore. Is he doing work w.r.t. shore?