# HW Ch3.doc - HW 3 Due date Midnight Please e-mail to...

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HW 3 Due date 5/10/19 Midnight Please e-mail to [email protected] Farah Dorrielan RUID: 177004407 1) A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor. A) True B) False 2) In order to get an object moving, you must push harder on it than it pushes back on you. A) True B) False 3) A girl attaches a rock to a string, which she then swings counter-clockwise in a horizontal circle. The string breaks at point P in the figure, which shows a bird's-eye view (as seen from above). Which path (A-E) will the rock follow? A) Path A B) Path B C) Path C D) Path D E) Path E 4) If you pound a feather with a hammer, which one feels a greater force? A) always the featherB) always the hammerC) The size of the force is always exactly the same on both of them.D) If the feather moves, then it felt the greater force. Otherwise the force was the same on both. 5) You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal. A) True B) False 6) In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you. A) True B) False When a question has too much restriction , then its most likely not true 7) You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is A) speeding up. B) slowing down. C) changing direction. D) speeding up and changing direction. E) slowing down and changing direction.

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HW 3 Due date 5/10/19 Midnight Please e-mail to [email protected] 8) While flying horizontally in an airplane, you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane. Using this observation, you can conclude that the airplane is 9) An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be A) greater than the weight of the elevator.
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