ga/bbcswebdav/pid-23547s7-dt-content-rid-3213425 2/courses/Spring 2017 PHYS191 2

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ga/bbcswebdav/pid-23547s7-dt-content-rid-3213425 2/courses/Spring 2017 PHYS191 20188/Exam% Part A Please choose the correct anneer Qeestieelaa P9 You swing a but and hit a heavy box with force of 1500N. The force the box exerts enthe bet A) exactly 1500 N only if the box does not move. B) exactly 1500N whether or not the box moves. Ogreater than 1500 N if the box D) less than 1500 Nifthe box moves. comes to 2 a pt You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus an immediate stop. The force acting on you that causes you to fall forward is A) The force of gravity. B) The normal force due to your contact with the floor ofthe bus. The force due to static friction between you and the floor of the bus. D) The force due to kinetic friction between you and the floor of the bus. E No forces were acting on you to cause you to fall. Questies gaa po A 60.0 person rides in an elevator while standing on a scale. The scale reads 400 N. 0kg acceleration of the elevator is closest to: A) 3.13 m/s2 downward. B) 6.67 m/s2 downward. D) 980 m/s downward. E)6.67 m/s upward. ouestiou (I which one ofthe following free-body diagrams the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward wah unchanging velocity? Fr is the force of the floor on the person and F is force of gravity on the person the

Explanation / Answer

here,

the force on the heavy box by bat , F = 1500 N

using the Newton's third law

the force the box exerts on the bat is exactly 1500 N whether or not the box moves

so the correct option is B)

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