Northern Virginia Community College
PHY 201, Spring 2018
Name: Ch. 4, 5
&6
Answer the following multiple-choice questions (0.5 point each)
1) You push on box G that is next to box H, causing both boxes to slide along the floor, as shown
in the figure. The reaction force to your push is
A) the push of box G on box H.
B) the push of box H on box G.
C) the push of box G against you.
D) the upward force of the floor n box G.
E) the acceleration of box G.
Answer: C
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2) The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can
apply a horizontal force either toward the right on m1 or toward the left on m2. The magnitude
of the force that the boxes exert on each other is
A) zero newtons in either case.
B) larger if is applied toward the right.
C) larger if is applied toward the left.
D) the same in either case.
Answer: C
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3) A 10-kg dog is runnng with a speed of 5.0 m/s. What is the minimum work required to stop
the dog in 2.40 s?
A) 50 J
B) 75 J
C) 100 J
D) 125 J
1
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, Answer: D
4) Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire
makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions
must be true about the tension T in the wire?
A) T sin θ = W
B) T cos θ = W
C) T tan θ = W
D) T = W
E) T = ma
Answer: A
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5) Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal
100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of
2.0 m/s to the right, and both weigh the same.
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on
the upper block, A?
A)
B)
C)
D)
E)
Answer: E
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2
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PHY 201, Spring 2018
Name: Ch. 4, 5
&6
Answer the following multiple-choice questions (0.5 point each)
1) You push on box G that is next to box H, causing both boxes to slide along the floor, as shown
in the figure. The reaction force to your push is
A) the push of box G on box H.
B) the push of box H on box G.
C) the push of box G against you.
D) the upward force of the floor n box G.
E) the acceleration of box G.
Answer: C
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
2) The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can
apply a horizontal force either toward the right on m1 or toward the left on m2. The magnitude
of the force that the boxes exert on each other is
A) zero newtons in either case.
B) larger if is applied toward the right.
C) larger if is applied toward the left.
D) the same in either case.
Answer: C
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
3) A 10-kg dog is runnng with a speed of 5.0 m/s. What is the minimum work required to stop
the dog in 2.40 s?
A) 50 J
B) 75 J
C) 100 J
D) 125 J
1
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https://www.coursehero.com/file/82865598/Practice-PHY-201-Exam-2-docx/
, Answer: D
4) Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire
makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions
must be true about the tension T in the wire?
A) T sin θ = W
B) T cos θ = W
C) T tan θ = W
D) T = W
E) T = ma
Answer: A
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5) Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal
100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of
2.0 m/s to the right, and both weigh the same.
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on
the upper block, A?
A)
B)
C)
D)
E)
Answer: E
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
2
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