Chapter 4 Quizzes

# Chapter 4 Quizzes - 2004 Quizzes 1 A packing crate slides...

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2004 Quizzes 1. A packing crate slides down an inclined ramp at constant velocity. We can conclude that A.* a frictional force acts on it. B. a net downward force acts on it. C. it may be accelerating. D. the weight of the crate is quite small. E. Not covered in the assigned reading. 2. In the absence of an external force, a moving object will A. stop immediately. B. slow down and eventually stop. C. go faster and faster. D.* move with constant speed. E. Not covered in the assigned reading. 3. 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? A. Mass is less, weight is same. B.* Weight is less, mass is same. C. Both mass and weight are less. D. Mass and weight are the same. E. Not covered in the assigned reading. 4. Action-reaction forces A. sometimes act on the same object. B. always act on the same object. C. may be at right angles. D.* always act on different objects. E. Not covered in the assigned reading. 5. An egg is dropped out of the window of a tall building. When it hits the ground, a force F will act on the egg that will cause it to crack. Which of the following is FALSE? A.* The force F is equal to the weight of the egg. B. The faster the egg is moving when it strikes the ground, the larger force F will be. C. The quicker the egg comes to a stop after striking the ground, the larger force F will be. D. Force F acts upward on the egg. E. Not covered in the assigned reading. 6. For a car to maintain a constant acceleration, the car's engine must A. maintain a constant power output. B. develop ever-decreasing power output. C.* develop ever-increasing power output. D. maintain a constant torque. E.* Not covered in the assigned reading. 7. A free-body diagram of a ball in free fall in the presence of air resistance would show A. a downward arrow to represent the force of air resistance. B. only a downward arrow to represent the force of gravity. C.* a downward arrow to represent the force of gravity and an upward arrow to represent the force of air resistance. D. an upward arrow to represent the force of gravity and a downward arrow to represent the force of air resistance. E. Not covered in the assigned reading. 8. A hammer drives a nail into a piece of wood. Identify an action-reaction pair, and compare the forces exerted by each object. A. The nail exerts a force on the hammer; the hammer exerts a force on the wood. B. The hammer exerts a force on the nail; the wood exerts a force on the nail. C.* The hammer exerts a force on the nail; the nail exerts a force on the hammer. D. The hammer exerts a force on the nail; the hammer exerts a force on the wood. E.

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## This note was uploaded on 08/29/2010 for the course PHYS 38234 taught by Professor Ramesh during the Spring '09 term at Berkeley.

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Chapter 4 Quizzes - 2004 Quizzes 1 A packing crate slides...

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