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Exam 5: Force and Motion

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Question 21

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A car is being towed at constant velocity on a horizontal road using a horizontal chain.The tension in the chain must be equal to the weight of the car in order to maintain constant velocity.

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Question 22

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A 7.0-kg object is acted on by two forces.One of the forces is 10.0 N acting toward the east.Which of the following forces is the other force if the acceleration of the object is 1.0 m/s² toward the east?

A) 6.0 N east
B) 3.0 N west
C) 12 N east
D) 9.0 N west
E) 7.0 N west

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Question 23

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The graph in the figure shows the net force acting on a 3.0-kg object as a function of time. (a)What is the acceleration of this object at time t = 2.0 s? (b)Draw,to scale,a graph of the acceleration of this object as a function of time over the range t = 0.00 s to t = 7.0 s.

The figure shows two forces,each of magnitude 4.6 N,acting on an object.The angle between these forces is 40°,and they make equal angles above and below the horizontal.What third force will cause the object to be in equilibrium (acceleration equals zero) ?

A ball is tossed vertically upward.When it reaches its highest point (before falling back downward)

The figure shows a graph of the acceleration of an object as a function of the net force acting on it.The mass of this object,in grams,is closest to

Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle.Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero?

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it.What is the acceleration at points A and B?

A woman is straining to lift a large crate,without success because it is too heavy.We denote the forces on the crate as follows: P is the upward force the woman exerts on the crate,C is the vertical contact force exerted on the crate by the floor,and W is the weight of the crate.How are the magnitudes of these forces related while the woman is trying unsuccessfully to lift the crate?

The figure shows two forces acting at right angles on an object.They have magnitudes = 6.3 N and = 2.1 N.What third force will cause the object to be in equilibrium (acceleration equals zero) ?