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Physics, 4e (Walker/Gatch) Chapter 5 Newton's Laws of Motion 5.1 Conceptual Questions 1) State Newton's first law of motion. Answer: An object at rest remains at rest as long as no net force acts on it. An object moving with constant velocity continues to move with the same speed and in the same direction as long as no net force acts on it. OR If the net force on an object is zero, its velocity is constant. Diff: 1 Var: 1 Page Ref: Sec. 5-2 2) State Newton's second law of motion. Answer: If an object is acted on by a net force, it will experience an acceleration that is equal to the net force divided by the mass. Because the net force is a vector, the acceleration is also a vector. In fact, the direction of an object's acceleration is the same as the direction of the net force acting on it. Diff: 1 Var: 1 Page Ref: Sec. 5-3 3) Why does it hurt more to fall from a certain height to the ground than it does to fall from the same height into a swimming pool? Answer: You go much further into the water before coming to a stop, thus your acceleration is much smaller, and the force exerted by the water is much smaller than that exerted by the ground. Diff: 1 Var: 1 Page Ref: Sec. 5-3 4) An astronaut in a space capsule is experiencing "weightlessness." Does the astronaut have to exert any effort to throw a bowling ball, since the bowling ball is also weightless? Answer: Yes. The ball will undergo an acceleration, and the force required to give it this acceleration is equal to the mass of the ball times the acceleration. Diff: 1 Var: 1 Page Ref: Sec. 5-3 5) State Newton's third law of motion. Answer: For every force that acts on an object, there is a reaction force acting on a different 1 Copyright (c) 2010 Pearson Education, Inc.