# 13 a person on a skateboard accelerates at a rate of

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13. A person on a skateboard accelerates at a rate of 1.5 m/s 2 . This rate means that she is moving 1.5 meters ttttttttttttt . 14. The symbol Δv represents . 15. A birdfeeder hanging from the branch of a tree does not move up or down because there is a tension force pulling the feeder that the force of gravity pulling the feeder down. 16. Rearrange the speed equation to isolate time on the left side of the equation. 17. Distinguish between balances forces and unbalanced forces. 18. If a car travels down the highway at a constant speed, are the forces acting on the car balances or unbalanced? Explain. 19. Is the friction between car tires and pavement greater when the car is at rest or in motion? Explain. constant direction speed reference point velocity slope

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static 5.1 meters sliding position velocity per second per second final v – initial v Balanced forces have an equal net force, unbalanced have one greater net force than other force acting on object. It is greater when the car is at rest because when it is at rest, it has static friction, which is stronger than the kinetic friction of when the car is in motion.
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• Spring '13
• McFerriz
• Force, 1.5 meters, car tires, 5.1 meters, 82 km/h

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