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

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Unformatted text preview: 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. 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. Distributed by: Tyrone G Carter 2. 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. 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. 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 w ill 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. 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. 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. 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. Not covered in the assigned reading. As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. At the moment the player begins to jump, the force of the floor on the shoes is A.* greater than the player’s weight. B. equal in magnitude and opposite in direction to the player's weight. C. less than the player’s weight. D. zero. E. Not covered in the assigned reading. The magnitude of the force of gravity acting on an object is 4. 5. 6. 7. 8. 9. 10. Distributed by: Tyrone G Carter TGC 2006 Quizzes 1. A. B. C.* D. E. frictional force. inertia. weight. mass. Not covered in the assigned reading. Distributed by: Tyrone G Carter 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 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 air resistance. D. an upward arrow to represent the force of gravity and a downward arrow to represent the air resistance. E. Not covered in the assigned reading. A child's toy is suspended from the ceiling by means of a string. The earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"? A. The string pulling upward on the toy with an 8-N force. B. The ceiling pulling upward on the string with an 8-N force. C. The string pulling downward on the ceiling with an 8-N force. D. The toy pulling upward on the earth with an 8-N force. E. None of these is true. Two identical objects are attached by a massless cord passing over a massless, frictionless pulley. The objects are initially held in place at rest at different heights. When the masses are released the A. lower object will go down. B. higher object will go down. C. objects will not move. D. motion depends on the masses of the objects. E. Not covered in the assigned reading. 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. A net A. B. C. D. E. force does NOT cause objects at rest to remain stationary. objects to start moving. objects to stop moving. objects to change direction. A net force causes all of these things to occur. We can conclude 2. 3. 4. 5. 6. A packing crate slides down an inclined ramp at constant velocity. 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. None of these is true. Distributed by: Tyrone G Carter TGC Distributed by: Tyrone G Carter 7. Two identical masses are attached by a string that passes over a pulley. One mass hangs from the pulley; the other rests on a table and is pulled to the right by the string. (This is much like the apparatus you used during the lab.) The table and the pulley are frictionless. The masses move with acceleration a. The acceleration due to gravity is g. Which of the following is true? A. a<g B. a=g C. a>g D. a=0 E. none of these. 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. An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his moment of inertia about the axis of rotation? A. It doubles. B. It increases slightly. C. It decreases slightly. D. It changes, but it is impossible to tell which way. E. Not covered in the assigned reading. An arrow is shot straight up. At the top of its path, the net force acting on it is A. greater than its weight. B. less than its weight but not zero. C. equal to zero. D. equal to its weight. E. Not covered in the assigned reading. 8. 9. 10. 2007 Quizzes Physics Honors Chapter 4 Quiz 1. Two identical masses are attached by a string that passes over a pulley. One mass hangs from the pulley; the other rests on a table and is pulled to the right by the string. The table and the pulley are frictionless. The masses move with acceleration a. The acceleration due to gravity is g. Which of the following is true? A. a<g B. a=g C. a>g D. a=0 E. none of these. When the rocket engines on a spaceship are suddenly turned off, while traveling in empty space, the starship will A. stop immediately. B. slowly slow down, and then stop. C. go faster and faster. D. move with constant speed. E. Not covered in the assigned reading. If you exert a force F on an object, the force which the object exerts on you will 2. 3. Distributed by: Tyrone G Carter TGC Distributed by: Tyrone G Carter A. B. C. D. E. 4. depend on whether or not the object is moving. depend on whether or not you are moving. depend on the masses of you and the object. be F in all cases. Not covered in the assigned reading. A block of mass M slides down a frictionless plane inclined at an angle θ with the horizontal. The normal force exerted by the plane on the block is A. Mg B. Mg sin θ C. Mg cos θ D. zero E. Mg tan θ Two cardboard boxes full of books are in contact with each other on a frictionless table. Box H has twice the mass of box G. You push box G into box H. If you push on box G with a horizontal force F, then box H will experience a net force of A. 2/3 F B. F C. 3/2 F D. 2F E. 3F An object of mass m is thrown straight up. it is A. greater than mg. B. exactly mg. C. less than mg, but greater than zero. D. zero. E. Not covered in the assigned reading. At its highest point, the net force on 5. 6. 7. An object of mass m is hanging by a string from the roof of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string? A. Less than mg. B. Exactly mg. C. Greater than mg. D. Zero. E. Not covered in the assigned reading. A 3 kg object falls toward the ground. Take the weight of the object to be the action force. What is the reaction force? A. There is none, because the object is not touching the Earth. B. The force of impact when the object hits the ground. C. The air resistance puching up on the object. D. The object gravitationally pulling upward on the Earth. E. None of these. As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. At the moment the player begins to jump, the force of the floor on the shoes is A. greater than the player’s weight. B. equal and opposite to the player's weight. C. less than the player’s weight. D. zero. E. None of these. An object is at rest on a horizontal surface. The area of contact between the object and the surface is A. The coefficient of friction for the object and surface is µ. The object is being pushed sideways by applied force F, but does not move. Weight force W and normal force N also act on the object. Which of the following does NOT influence the magnitude of the frictional force acting on the object? 8. 9. 10. Distributed by: Tyrone G Carter TGC Distributed by: Tyrone G Carter A. B. C. D. contact area, A applied force, F normal force, N friction coefficient, m 2008 Quizzes Physics Honors Chapter 4 Quiz 1. An arrow is shot straight up. At the top of its path, the net force acting on it is A. greater than its weight. B. less than its weight but not zero. C. equal to zero. D. equal to its weight. E. None of these is definitely true. A car is being pushed forward by a 1000 N force because of its engine. Friction and air resistance push backward on the car with a force of 900 N. What is the car doing? A. Moving at constant speed. B. Getting faster and faster. C. Getting slower and slower. D. Nothing; it is not moving. E. Changing direction. The magnitude of the force of gravity acting on an object is A. frictional force. B. inertia. C. weight. D. mass. E. None of these. Two toy cars (16 kg and 2 kg) are released simultaneously on an inclined plane that makes an angle of 30º with the horizontal. The gravitational acceleration is g. The 16-kg car's acceleration is _____________ the 2-kg car's acceleration. A. 8 times larger than B. 16 times larger than C. twice as large as D. exactly the same as E. 8 times smaller than 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. None of the statements above are false. In a baseball game, your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is A. somewhat less than 1500 N. B. somewhat greater than 1500 N. C. exactly equal to 1500 N. D. essentially zero. 2. 3. 4. 5. 6. Distributed by: Tyrone G Carter TGC Distributed by: Tyrone G Carter E. 7. Not covered in the assigned reading. 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. A packing crate slides down an inclined ramp at constant velocity. 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. the mass of the crate is quite small. We can conclude 8. 9. A child's toy is suspended from the ceiling by means of a string. The earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"? A. The string pulling upward on the toy with an 8-N force. B. The ceiling pulling upward on the string with an 8-N force. C. The string pulling downward on the ceiling with an 8-N force. D. The toy pulling upward on the earth with an 8-N force. E. None of these is true. Action-reaction forces A. sometimes act on the same object. B. always act on the same object. C. may be at right angles to each other. D. always act on different objects. E. None of these are true. 10. Distributed by: Tyrone G Carter TGC ...
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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 University of California, Berkeley.

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