ch4-6 - Chapter 4, The Laws of Motion CHAPTER 4 Conceptual...

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c. mg sin------- θ c. 300 N------- b. 50 N---------- d. Choose this answer if all the statements are true.------------- c. It is more than W. ----------- a. It is less than W. Chapter 4, The Laws of Motion C HAPTER 4 Conceptual Problems 1. A crate of weight W is being pushed across a horizontal surface by a force directed at an angle of 20 ° below the horizontal. What is the magnitude of the normal force on the crate? b. It equals W. d. None of the above since the coefficient of kinetic friction is not given. 2. The net force on an object is in the positive x-direction. Consider the following statements. (i) The object can be moving in the negative x-direction. (ii) The object can be speeding up. (iii) The object can be slowing down. (iv) The object can be moving in the positive y-direction. Which of the statements are true? a. (i) and (ii) b. (ii) and (iii) c. (iii) and (iv) 3. An object weighs 100 N. If the gravitational constant G were half of what it is currently, what would the weight of the object be? a. 100 N c. 25 N d. 200 N 4. Five boxes, each having weight 100 N, are stacked up. The bottom box is the fifth from the top. What is the magnitude of the normal force upward exerted by the fourth box from the top on the third box from the top? a. 100 N b. 200 N d. 400 N 5. A box of mass m is placed on an incline with angle of inclination θ . The box does not slide. The magnitude of the frictional force in this case is: a. μ s mg sin θ . b. mg cos θ . . d. not given. 4.1 Forces 41
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Chapter 4, The Laws of Motion 4.2 Newton’s First Law 4.3 Newton’s Second Law 4.4 Newton’s Third Law 1. Which of the following is an example of the type of force that acts at a distance? a. gravitational b. magnetic c. electrical 2. If we know an object is moving at constant velocity, we may assume: a. the net force acting on the object is zero. b. there are no forces acting on the object. c. the object is accelerating. d. the object is losing mass. 3. Which of the following expresses a principle, which was initially stated by Galileo and was later incorporated into Newton’s laws of motion? a. An object’s acceleration is inversely proportional to its mass. b. For every action there is an equal but opposite reaction. c. The natural condition for a moving object is to remain in motion. d. The natural condition for a moving object is to come to rest. 4. What condition must apply to a system’s state of motion for it to be regarded as an inertial frame of reference? a. in decreasing velocity b. in constant velocity c. in constant acceleration d. in increasing acceleration 5. A 7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration? a. 35 m/s 2 b. 7.0 m/s 2 c. 5.0 m/s 2 d. 0.71 m/s 2 42 d. all of the above-----
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Chapter 4, The Laws of Motion 6. An astronaut applies a force of 500 N to an asteroid, and it accelerates at 7.00 m/s 2 . What is the asteroid’s mass? a. 71 kg
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ch4-6 - Chapter 4, The Laws of Motion CHAPTER 4 Conceptual...

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