Newton’s 3rd law of motion states that whenever one object exerts a force on a second object

The second object exerts an equal and opposite force on the first object.

Uh, not entirely sure about the phrasing of the question, but I think it means "What is newton's third law of motion". Newton's third law of motion is that every action has an equal and opposite reaction.

shows up as a (purple)/ (flashing) red or blue dot getting bigger and brighter.

explanation: