Physics Review Question

Unit: Mechanics
Year: 1996 Question#: 15
Question: An inflated balloon released from rest moves horizontally with velocity v. The velocity of the balloon is most likely caused by
(1 ) action-reaction
(2 ) centripetal force
(3 ) gravitational attraction
(4 ) rolling friction

What is this question really asking?

Explanation by: Eric D (partly)

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Answer 1
action reaction


Newton's third law says forces always act in pairs on different objects. When the balloon is released we have the force of the balloon on the air which accelerates the air and the force of the air on the balloon accelerating the balloon. return to top

Answer 2
centripetal force

Centripetal force is the force which keeps an object moving in a circular path. return to top

Answer 3
gravitational attraction


gravitational attraction is the force of attraction that exists between masses return to top

Answer 4
rolling friction


rolling friction is the force opposing the motion of one body that is rolling over another body. return to top

What's this question really asking?

What topic is related to the force causing the balloon to move? return to top

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