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02.-C04-The-Laws-of-Motion-Concepts-Phy-2053-Fall-08

# 02.-C04-The-Laws-of-Motion-Concepts-Phy-2053-Fall-08 - The...

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The Laws of Motion

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In the absence of an external force, a moving object will A. move with constant velocity. B. stop immediately. C. slow down and eventually come to a stop. D. go faster and faster. Concept Questions 1
A rocket moves through empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is A. equal to its weight. B. equal to its mass. C. dependent on how fast it is moving. D. zero. Concept Questions 2

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You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forward? A. gravity B. normal force due to your contact with the floor of the bus C. force due to friction between you and the floor of the bus D. There is not a force leading to your fall. Concept Questions 3
The acceleration of an object is inversely proportional to A. the net force acting on it. B. its position. C. its velocity. D. its mass. Concept Questions 4

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A net force F acts on a mass m and produces an acceleration a . What acceleration results if a net force 2F acts on mass 4m ? A. 2a B. 8a C. 4a D. Concept Questions 5 2 a
Two cars collide head-on. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of A. Newton's first law.

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