Question 1

The diagrams below show the application of an external force F on a block of mass m resting on a horizontal surface.  In which diagrams)  does the block experience the largest normal force?

Accepted Answer

A)   Both 1)  and 3) 
B)   Only 1) 
C)   Only 2) 
D)   Only 3) 
E)   Only 4) F) A) and B)
G) B) and E)

Question 2

A body of weight w rests on the surface of Earth. What force does the body exert on Earth? Ignore Earth's rotation.)

Accepted Answer

A)   w
B)   greater than w
C)   less than w
D)   9.81w
E)   zeroF) B) and C)
G) A) and E)

Question 3

1 and m2 m1 2)  are connected to the rope over the pulley. The masses are free to drop. The magnitude of the tension Ttop is ____ the sum of the tensions T1 and T2. A)  less than B)  equal to C)  greater than D)  not related to E)  dependent on Ttop" class="answers-bank-image d-inline" rel="preload" > A frictionless pulley of negligible mass is hung from the ceiling using a rope, also of negligible mass. Two masses, m1 and m2 m1 2)  are connected to the rope over the pulley. The masses are free to drop. The magnitude of the tension Ttop is ____ the sum of the tensions T1 and T2.

Accepted Answer

A)   less than
B)   equal to
C)   greater than
D)   not related to
E)   dependent on TtopF) B) and D)
G) A) and E)

Question 4

An unknown force A and MB. Their accelerations   and   are measured. From these data we can determine A)  the magnitude of   only. B)  MA and MB only. C)  the magnitudes of   , MA, and MB only. D)  the ratio of MA to MB only. E)  MA, MB, and the weights of MA and MB." class="answers-bank-image d-inline" rel="preload" > is applied to two unknown masses MA and MB. Their accelerations A and MB. Their accelerations   and   are measured. From these data we can determine A)  the magnitude of   only. B)  MA and MB only. C)  the magnitudes of   , MA, and MB only. D)  the ratio of MA to MB only. E)  MA, MB, and the weights of MA and MB." class="answers-bank-image d-inline" rel="preload" > and A and MB. Their accelerations   and   are measured. From these data we can determine A)  the magnitude of   only. B)  MA and MB only. C)  the magnitudes of   , MA, and MB only. D)  the ratio of MA to MB only. E)  MA, MB, and the weights of MA and MB." class="answers-bank-image d-inline" rel="preload" > are measured. From these data we can determine

Accepted Answer

A)   the magnitude of A and MB. Their accelerations   and   are measured. From these data we can determine 
A)   the magnitude of   only. 
B)   MA and MB only. 
C)   the magnitudes of   , MA, and MB only. 
D)   the ratio of MA to MB only. 
E)   MA, MB, and the weights of MA and MB." class="answers-bank-image d-inline" rel="preload" > only.
B)   MA and MB only.
C)   the magnitudes of A and MB. Their accelerations   and   are measured. From these data we can determine 
A)   the magnitude of   only. 
B)   MA and MB only. 
C)   the magnitudes of   , MA, and MB only. 
D)   the ratio of MA to MB only. 
E)   MA, MB, and the weights of MA and MB." class="answers-bank-image d-inline" rel="preload" > , MA, and MB only.
D)   the ratio of MA to MB only.
E)   MA, MB, and the weights of MA and MB.F) A) and D)
G) A) and B)

Question 5

A force accelerates a body of mass M. A second body requires twice as much force to produce the same acceleration. What is the mass of the second body?

Accepted Answer

A)   M
B)   2M
C)   M/2
D)   4M
E)   M/4F) A) and E)
G) All of the above

Question 6

A body moves with constant speed in a straight line. Which of the following statements must be true?

Accepted Answer

A)   No force acts on the body.
B)   A single constant force acts on the body in the direction of motion.
C)   A single constant force acts on the body in the direction opposite to the motion.
D)   A net force of zero acts on the body.
E)   A constant net force acts on the body in the direction of motion.F) C) and D)
G) A) and B)

Question 7

Three blocks are connected by massless cords and hung by a third massless cord to a beam. Mass m1 = 2 m2 = 3 m3. Mass m1 is the lowest block and m3 is the highest. The tension in the cord between the two highest blocks is

Accepted Answer

A)   3m1 * g/2.
B)   m1 * g/2.
C)   m1 * g/6.
D)   2m1 *g/3.
E)   6m1 * g/11.F) C) and E)
G) C) and D)

Question 8

A particle with a mass of 200 g is acted on by a net force of 4.5 N. The acceleration of the particle is

Accepted Answer

A)   90 cm/s2.
B)   2.3 cm/s2. 
C)   0.90 km/s2.
D)   23 m/s2.
E)   9.0 m/s2.F) A) and B)
G) A) and C)

Question 9

A horse harnessed to a wagon refuses to pull, citing Newton's third law, which states that for every force there is an equal but opposite reaction force. The horse, incorrect in its reasoning, can pull the wagon because

Accepted Answer

A)   after it gives a jerk and the wagon is moving, its pulling force will be greater than the reaction to this force.
B)   the law applies only to static cases.
C)   the wagon cannot possibly pull back with a force equal in magnitude to the pulling force.
D)   the action and reaction forces are acting on different bodies.
E)   after friction is overcome, the reaction force is less than the pulling force.F) B) and D)
G) A) and E)

Question 10

An inertial reference frame is one in which

Accepted Answer

A)   Newton's first law describes the behavior of matter.
B)   the law of inertia is not applicable.
C)   there is a great deal of matter.
D)   the object of interest is traveling in a circular path.
E)   forces do not necessarily exist in pairs.F) D) and E)
G) B) and E)

Question 11

Which of the following free-body diagrams represents the car going downhill without acceleration?

Accepted Answer

A)   1) 
B)   2) 
C)   3) 
D)   4) 
E)   5) F) A) and C)
G) D) and E)

Question 12

Which of the following statements is true?

Accepted Answer

A)   The mass of a body is a quantitative measure of its inertia.
B)   Mass is a vector quantity.
C)   The mass of a body is directly proportional to the acceleration it is experiencing.
D)   The unit of mass in the U.S. customary system is the newton.
E)   The mass of a body is inversely proportional to the resultant force acting on it.F) C) and D)
G) B) and E)

Question 13

What is the weight of a 50-kg boy on the Moon, where the acceleration due to gravity is 1.6 m/s2?

Accepted Answer

A)   80 N
B)   100 N
C)   490 N
D)   50 N
E)   80 lbsF) A) and B)
G) B) and E)

Question 14

A mass of 25 kg is acted on by two forces, one of which is 15 N due east while the second one is 10 N due north. The acceleration of the mass is

Accepted Answer

A)   0.72 m/ s2, 56.3o north of east.
B)   0.20 m/ s2, due east.
C)   0.72 m/ s2, 33.7 o north of east.
D)   1.0 m/ s2, 33.7 o north of east.
E)   0.20 m/ s2, 56.3 o north of east.F) D) and E)
G) B) and E)

Question 15

Your heart pumps 80 g of blood with each beat. The blood starts from rest and reaches a speed of 0.60 m/s in the aorta. If each beat takes 0.16 s, the average force exerted on the blood is

Accepted Answer

A)   3.0 * 102 N.
B)   0.22 N.
C)   0.16 N.
D)   0.30 N.
E)   0.98 N.F) A) and C)
G) None of the above

Question 16

Which of the following is not a unit of mass?

Accepted Answer

A)   pound
B)   kilogram
C)   gram
D)   slug
E)   milligramF) B) and D)
G) A) and B)

Question 17

Newton's law of inertia does not describe the behavior of objects that are

Accepted Answer

A)   in inertial frames of reference.
B)   moving with constant velocity relative to a given frame of reference.
C)   at rest relative to a given frame of reference.
D)   moving in accelerated frames of reference.
E)   moving in a straight line at constant speed relative to a given reference frame.F) A) and C)
G) B) and E)

Question 18

We all know it makes sense to bend one's knees when dropping from a height.Suppose a very silly 70-kg person were instead to drop down from a height of 1.4 m onto the ground and stop stiffly within a distance of only 0.60 cm. Calculate how many times his own weight is the average force his body feels.

Accepted Answer

A)   15
B)   24
C)   2.3 * 103
D)   6.1 *102
E)   2.3 *102F) B) and E)
G) B) and D)

Question 19

A 100-kg man on ice skates pushes a 25-kg boy, also on skates, with a force of 250 N. As a result,

Accepted Answer

A)   both the man and the boy will have an acceleration of magnitude 2 m/s2.
B)   only the boy will have an acceleration of magnitude 2 m/s2.
C)   only the man will have an acceleration of magnitude 10 m/s2.
D)   the man will have an acceleration of magnitude 2.5 m/s2.
E)   the heavier man will be stationary.F) A) and E)
G) A) and D)

Question 20

A ball of mass 2.0 kg is acted on by two forces, 2. B)  3.9 m/s2. C)  4.6 m/s2. D)  5.1 m/s2. E)  5.8 m/s2." class="answers-bank-image d-inline" rel="preload" > and 2. B)  3.9 m/s2. C)  4.6 m/s2. D)  5.1 m/s2. E)  5.8 m/s2." class="answers-bank-image d-inline" rel="preload" > . The magnitude of the acceleration is

Accepted Answer

A)   2.5 m/s2.
B)   3.9 m/s2.
C)   4.6 m/s2.
D)   5.1 m/s2.
E)   5.8 m/s2.F) All of the above
G) B) and C)

Exam 4: Forces and Motion I: Newtons Laws

An unknown force is applied to two unknown masses M_A and M_B. Their accelerations and are measured. From these data we can determine

Correct Answer
verified

A body of weight w rests on the surface of Earth. What force does the body exert on Earth? Ignore Earth's rotation.)

Correct Answer
verified

A frictionless pulley of negligible mass is hung from the ceiling using a rope, also of negligible mass. Two masses, m₁ and m₂ m₁ < m₂) are connected to the rope over the pulley. The masses are free to drop. The magnitude of the tension T_top is ____ the sum of the tensions T₁ and T₂.

Correct Answer
verified

Three blocks are connected by massless cords and hung by a third massless cord to a beam. Mass m₁ = 2 m₂ = 3 m₃. Mass m₁ is the lowest block and m₃ is the highest. The tension in the cord between the two highest blocks is

Correct Answer
verified

A body moves with constant speed in a straight line. Which of the following statements must be true?

Correct Answer
verified

A 100-kg man on ice skates pushes a 25-kg boy, also on skates, with a force of 250 N. As a result,

Correct Answer
verified

A particle with a mass of 200 g is acted on by a net force of 4.5 N. The acceleration of the particle is

Correct Answer
verified

Which of the following is not a unit of mass?

Correct Answer
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Newton's law of inertia does not describe the behavior of objects that are

Correct Answer
verified

Your heart pumps 80 g of blood with each beat. The blood starts from rest and reaches a speed of 0.60 m/s in the aorta. If each beat takes 0.16 s, the average force exerted on the blood is

Correct Answer
verified

The diagrams below show the application of an external force F on a block of mass m resting on a horizontal surface. In which diagrams) does the block experience the largest normal force?

Correct Answer
verified

A horse harnessed to a wagon refuses to pull, citing Newton's third law, which states that for every force there is an equal but opposite reaction force. The horse, incorrect in its reasoning, can pull the wagon because

Correct Answer
verified

A force accelerates a body of mass M. A second body requires twice as much force to produce the same acceleration. What is the mass of the second body?

Correct Answer
verified

Which of the following statements is true?

Correct Answer
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Correct Answer
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An inertial reference frame is one in which

Correct Answer
verified

A ball of mass 2.0 kg is acted on by two forces, and . The magnitude of the acceleration is

Correct Answer
verified

A mass of 25 kg is acted on by two forces, one of which is 15 N due east while the second one is 10 N due north. The acceleration of the mass is

Correct Answer
verified

Which of the following free-body diagrams represents the car going downhill without acceleration?

Correct Answer
verified

What is the weight of a 50-kg boy on the Moon, where the acceleration due to gravity is 1.6 m/s²?

Correct Answer
verified

Exam 4: Forces and Motion I: Newtons Laws

An unknown force is applied to two unknown masses MA and MB. Their accelerations and are measured. From these data we can determine

Correct AnswerverifiedShow Answer

A body of weight w rests on the surface of Earth. What force does the body exert on Earth? Ignore Earth's rotation.)

Correct AnswerverifiedShow Answer

A frictionless pulley of negligible mass is hung from the ceiling using a rope, also of negligible mass. Two masses, m1 and m2 m1 < m2) are connected to the rope over the pulley. The masses are free to drop. The magnitude of the tension Ttop is ____ the sum of the tensions T1 and T2.

Correct AnswerverifiedShow Answer

Three blocks are connected by massless cords and hung by a third massless cord to a beam. Mass m1 = 2 m2 = 3 m3. Mass m1 is the lowest block and m3 is the highest. The tension in the cord between the two highest blocks is

Correct AnswerverifiedShow Answer

A body moves with constant speed in a straight line. Which of the following statements must be true?

Correct AnswerverifiedShow Answer

A 100-kg man on ice skates pushes a 25-kg boy, also on skates, with a force of 250 N. As a result,

Correct AnswerverifiedShow Answer

A particle with a mass of 200 g is acted on by a net force of 4.5 N. The acceleration of the particle is

Correct AnswerverifiedShow Answer

Which of the following is not a unit of mass?

Correct AnswerverifiedShow Answer

Newton's law of inertia does not describe the behavior of objects that are

Correct AnswerverifiedShow Answer

Your heart pumps 80 g of blood with each beat. The blood starts from rest and reaches a speed of 0.60 m/s in the aorta. If each beat takes 0.16 s, the average force exerted on the blood is

Correct AnswerverifiedShow Answer

The diagrams below show the application of an external force F on a block of mass m resting on a horizontal surface. In which diagrams) does the block experience the largest normal force?

Correct AnswerverifiedShow Answer

A horse harnessed to a wagon refuses to pull, citing Newton's third law, which states that for every force there is an equal but opposite reaction force. The horse, incorrect in its reasoning, can pull the wagon because

Correct AnswerverifiedShow Answer

A force accelerates a body of mass M. A second body requires twice as much force to produce the same acceleration. What is the mass of the second body?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An inertial reference frame is one in which

Correct AnswerverifiedShow Answer

A ball of mass 2.0 kg is acted on by two forces, and . The magnitude of the acceleration is

Correct AnswerverifiedShow Answer

A mass of 25 kg is acted on by two forces, one of which is 15 N due east while the second one is 10 N due north. The acceleration of the mass is

Correct AnswerverifiedShow Answer

Which of the following free-body diagrams represents the car going downhill without acceleration?

Correct AnswerverifiedShow Answer

What is the weight of a 50-kg boy on the Moon, where the acceleration due to gravity is 1.6 m/s2?

Correct AnswerverifiedShow Answer

An unknown force is applied to two unknown masses M_A and M_B. Their accelerations and are measured. From these data we can determine

Correct Answer
verified

Correct Answer
verified

A frictionless pulley of negligible mass is hung from the ceiling using a rope, also of negligible mass. Two masses, m₁ and m₂ m₁ < m₂) are connected to the rope over the pulley. The masses are free to drop. The magnitude of the tension T_top is ____ the sum of the tensions T₁ and T₂.

Correct Answer
verified

Three blocks are connected by massless cords and hung by a third massless cord to a beam. Mass m₁ = 2 m₂ = 3 m₃. Mass m₁ is the lowest block and m₃ is the highest. The tension in the cord between the two highest blocks is

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

What is the weight of a 50-kg boy on the Moon, where the acceleration due to gravity is 1.6 m/s²?

Correct Answer
verified