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Atomic structure & behavior: A few questions

Explain, phenomena in terms of atomic structure and behavior.

1 When you lightly bump into a car, why does it dent and not create a hole?
2 How does glue or tape stick to things?
3 What happens when a puddle evaporates?
4 What happens when you get a cut or scrape?
5 Why doesn't your hand go through a door when you knock?

Solution Preview

1 When you lightly bump into a car, why does it dent and not create a hole?
When one car bumps into the other, the kinetic energy of the moving car is transferred from one body of the car to the other.
Fenders are specifically designed to absorb this kinetic energy by spreading the force of the impact. It also bends upon impact and this "give" is what helps protect the car to a certain extent and thus prevents creation of hole in the car due to spreading of force.

2 How does glue or tape stick to things?
Wood, paper and many other materials have tiny cracks and holes in them that are so small you can not see them without a magnifying glass or microscope. When you glue/ tape these materials together, the glue seeps into their tiny openings and then hardens so that the materials get stuck together. Sometimes the molecules in an adhesive and the molecules in the thing being glued/ taped get tangled together and are hard to get apart, or they may have a chemical reaction and get stuck together.

A good adhesive has excellent properties of adhesion (the ability to stick to the surfaces to which it's applied) and cohesion (the ability to ...

Solution Summary

This solution details a review of atomic structure & behavior under a variety of scenarios such as what happens when you lightly bump into a car, how does glue or tape stick to things, what happens when a puddle evaporates, what happens when you get a cut or scrape and why doesn't your hand go through a door when you knock. These questions would be answered on the basis of atomic structure and behavior.

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