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# A lead block is suspended from your hand by a string

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5) A lead block is suspended from your hand by a string. The reaction to the force of gravity on the block is the force exerted by the: A) string on the block B) block on the string C) string on the hand D) hand on the string E) block on the earth 6) The inertia of a body tends to cause the body to: 7) A physics textbook is suspended on a spring scale in an elevator. Of the following, the scale shows the highest reading when the elevator:

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8) A bug splatters on the windshield of a moving car. Compared to the magnitude of the force acting on the car, the magnitude of the force acting on the bug is 9) A constant net force acts on an object. Describe the motion of the object. (a) constant acceleration (b) constant speed (c) constant velocity (d)increasing acceleration. 10) A box slides down an inclined plane making an angle of 30 0 with the horizontal. The block moves at constant speed. The coefficient of kinetic friction between the block and the incline is 11) You are standing in a moving bus, facing forward, and you suddenly fall backward. You can imply from this that the bus's 12) The acceleration due to gravity is lower on the moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the moon's surface, compared to Earth? 13) A net force F acts on a mass m and produces an acceleration a. What acceleration results if a net force F/2 acts on the same mass m?
a. a b. 4a c. 2a d. a/2 14) Which of the following quantities is NOT a vector? 15) A 2 kg box is being pulled on a horizontal surface by a force that makes 40 0 with horizontal. If the coefficient of kinetic friction is 0.2 what is magnitude of the force if the acceleration of the box is 3 m/s 2 . Use g=10m/s 2 here. a.10N b.11N c. 6N d.13N Section 3:

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