Physics 011

MC#4

Chapter 4: Motion and Force: Dynamics
MC

1.	A non-zero net force acting on a body will have which effect? The correct answer: The velocity of the body will change. See Section 4-2
2.	Body A has a mass that is twice as great as that of body B. If a force acting on body A is half the value of a force acting on body B, which statement is true? The correct answer: The acceleration of A will be one fourth that of B. See Section 4-4
3.	What is the magnitude of the net force required to impart an acceleration of magnitude 10 m/s^2 to a body with a mass of 2.0 kg? The correct answer: 20 N See Section 4-4
4.	Newton's second law can be stated as which of the following? The correct answer: Force and the acceleration it produces are directly proportional.
5.	If two forces act concurrently on a body, the resultant force will be greatest when the angle between them is: The correct answer: 0^o See Sections 4-4, 4-7
6.	A force acting on a box can have one of the four orientations, A, B, C or D indicated below. In which orientation will the force have the smallest vertical component? Your answer: A The correct answer: C See Section 4-7
7.	As the magnitude of the vector sum of the forces acting on a body increases, the magnitude of the acceleration of the body must The correct answer: increase. See Sections 4-4, 4-7
8.	For a body experiencing zero acceleration, which statement is most true? The correct answer: The body may be at rest. See Sections 2-4, 4-4
9.	The magnitude of the acceleration of a body is 2.5 m/s^2 when it is acted on by a net force of the magnitude of which is 5.0 N. The mass of the body is: The correct answer: 2.0 kg
10.	Which graph best represents the relation between the force of gravity and the mass of a free-falling body? The correct answer: See Section 4-4
11.	The magnitude of the acceleration of an object of mass mo subjected to a single constant force of magnitude Fo is ao. If the magnitude of the force was decreased slightly, the magnitude of the acceleration of the object would be ____ ao. The correct answer: less than See Section 4-4
12.	The magnitude of the acceleration of an object of mass mo subjected to a single constant force of magnitude Fo is ao. If this same force was exerted on a second object with mass m2 > mo, the magnitude of the acceleration of this second object would be ____ ao. The correct answer: less than See Section 4-4
13.	The magnitude of the acceleration of an object of mass mo subjected to a single constant force of magnitude Fo is ao. If the magnitude of the force was increased slightly, the mass of the object would ____. The correct answer: remain constant See Sections 4-3, 4-4
14.	An object of mass mo is simultaneously subjected to two forces: F1 = 6 N i and F2 = -3 N i. The magnitude of the acceleration of the object is ao. If the magnitude of F1 was increased slightly, the magnitude of the acceleration of the object would ___. The correct answer: increase
15.	An object of mass mo is simultaneously subjected to two forces: F1 = 6 N i and F2 = -3 N i. The magnitude of the acceleration of the object is ao. In order to double the magnitude of the acceleration of the object, F1 would have to be ____. The correct answer: increased by 3N See Section 4-4
16.	An object of mass mo is simultaneously subjected to two forces: F1 = 6 N i and F2 = -3 N i. The magnitude of the acceleration of the object is ao. If the magnitude of both forces was doubled, the magnitude of the acceleration of the object would be ao x ____. The correct answer: 2 See Section 4-4
17.	If the mass of a moving body is doubled, the inertia of the body will be The correct answer: twice as great as its original value. See Section 4-3
18.	After a rocket is launched, its engines are shut off. The rocket continues to move in a straight line at constant speed. This is an example of The correct answer: inertia. See Section 4-2
19.	What is the magnitude of the weight of a 2.0 kg body on or near the surface of the earth? The correct answer: 19.6 N See Section 4-6
20.	On a large asteroid, the weight of, or the force of gravity on, a 10 kg body is 20 N. What is the magnitude of the acceleration due to gravity on the asteroid? The correct answer: 2.0 m/s^2 See Section 4-6
21.	A box rests on a level table. Which of the following is an action-reaction pair of forces? The correct answer: The weight of the box and the upward force on the earth.
22.	A 1000 pound safe falls off the back of a flatbed truck as the truck travels with constant speed down the interstate. As the safe falls toward the ground, ... ...the magnitude of the gravitational force exerted on the safe by the earth is ____ 1000 pounds. The correct answer: equal to See Section 4-5
23.	A 1000 pound safe falls off the back of a flatbed truck as the truck travels with constant speed down the interstate. As the safe falls toward the ground, ... ...the magnitude of the gravitational force exerted on the earth by the safe is ____ 1000 pounds. The correct answer: equal to See Section 4-5
24.	A 1000 pound safe falls off the back of a flatbed truck as the truck travels with constant speed down the interstate. As the safe falls toward the ground, ... ...the magnitude of the acceleration of the earth toward the safe is ____. The correct answer: less than 9.8 m/s^2 but greater than 0 See Sections 4-4, 4-5