Types of Radioactive Decay — Unit test

Question 9 • 2001310 Earth Science Sem 1 - Reeves

Which best describes friction?

Answer

a downward pull when objects fall through the air

a constant force that acts on objects that rub together

a downward pull on objects that roll on bumpy surfaces

a constant force that pulls two objects toward each other

Explanation

Friction is a force that opposes motion when two surfaces rub against each other. Choice B best describes this contact force. The downward pull through air in A is gravity, while D describes gravitational attraction between objects.

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