Question 1

A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s. What magnitude force does a 68.0 kg passenger experience during the acceleration?

Accepted Answer

A)  394 N
B)  82.0 N
C)  342 N
D)  311 NE) A) and B)
F) None of the above

Question 2

A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?

Accepted Answer

A)  4.91 m/s2
B)  9.81 m/s2
C)  46.9 m/s2
D)  0.206 m/s2
E)  0.422 m/s2F) B) and C)
G) A) and D)

Question 3

A satellite is in orbit around the earth. Which one feels the greater force?

Accepted Answer

A)  the satellite because the earth is so much more massive
B)  the earth because the satellite has so little mass
C)  Earth and the satellite feel exactly the same force.
D)  It depends on the distance of the satellite from Earth.E) A) and B)
F) A) and D)

Question 4

A girl attaches a rock to a string, which she then swings counter-clockwise in a horizontal circle. The string breaks at point P in the figure, which shows a bird's-eye view (as seen from above) . Which path (A-E) will the rock follow?

Accepted Answer

A)  Path A
B)  Path B
C)  Path C
D)  Path D
E)  Path EF) A) and E)
G) A) and B)

Question 5

A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then acts on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters. What is the magnitude of the force F?

Accepted Answer

The answer of A box of mass 72 kg is...

Question 6

The figure shows an acceleration-versus-force graph for three objects pulled by wires. If the mass of object 2 is 36 kg, what are the masses of objects 1 and 3?

Accepted Answer

A)  12 kg and 90 kg
B)  72 kg and 18 kg
C)  90 kg and 12 kg
D)  12 kg and 72 kgE) A) and B)
F) B) and C)

Question 7

A catcher stops a 0.15-kg ball traveling at 40 m/s in a distance of 20 cm. What is the magnitude of the average force that the ball exerts against his glove?

Accepted Answer

The answer of A catcher stops a 0.15-kg ball traveling...

Question 8

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point

Accepted Answer

A)  down the ramp.
B)  up the ramp.
C)  perpendicular to the ramp.
D)  vertically downward.
E)  None of the above choices is correct.F) B) and E)
G) A) and B)

Question 9

In a certain particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.67 × 10-27 kg. What is the force on the proton?

Accepted Answer

Question 10

An object has a mass of 60 kg on Earth. What are the mass and weight of this object on the surface of the Moon where the acceleration due to gravity is only 1/6 of what it is on Earth?

Accepted Answer

mass = 60 ...

Question 11

An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be

Accepted Answer

A)  greater than the weight of the elevator.
B)  less than than the weight of the elevator.
C)  equal to the weight of the elevator.D) A) and B)
E) All of the above

Question 12

In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you.

Accepted Answer

A) True 
 B)False

Question 13

An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth?

Accepted Answer

A)  16 N
B)  61 N
C)  99 N
D)  600 N
E)  440 NF) B) and D)
G) A) and E)

Question 14

The figure shows an acceleration-versus-force graph for a 125-g object. What should be the value of the first tick-mark on the vertical scale, as indicated by the arrow in the figure?

Accepted Answer

A)  4
B)  8
C)  0.00400
D)  0.00800E) All of the above
F) C) and D)

Question 15

A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator, what would the scale read?

Accepted Answer

A)  more than 700 N
B)  less than 700 N
C)  700 N
D)  It could be more or less than 700 N, depending on whether the elevator is going up or down.E) A) and D)
F) C) and D)

Question 16

Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings) , initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start moving away from Bill. Just after Bill stops pushing,

Accepted Answer

A)  Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill.
B)  Susan is moving away from Bill, and Bill is stationary.
C)  Susan and Bill are moving away from each other, with equal speeds.
D)  Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill.E) C) and D)
F) A) and B)

Question 17

On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

Accepted Answer

A)  2.5 m/s2
B)  2.0 m/s2
C)  1.5 m/s2
D)  1.0 m/s2E) B) and D)
F) C) and D)

Question 18

An object of mass m rests on a flat table. The earth pulls on this object with a force of magnitude mg. What is the reaction force to this pull?

Accepted Answer

A)  The table pushing up on the object with force mg.
B)  The object pushing down on the table with force mg.
C)  The table pushing down on the floor with force mg.
D)  The object pulling upward on the Earth with force mg.
E)  The table pulling upward on the Earth with force mg.F) A) and E)
G) A) and B)

Question 19

What magnitude net force is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in 10.0 s?

Accepted Answer

A)  444 N
B)  1620 N
C)  3240 N
D)  4360 N
E)  11800 NF) D) and E)
G) None of the above

Question 20

You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal.

Accepted Answer

A) True 
 B)False

Exam 4: Forces and Newtons Laws of Motion

An object has a mass of 60 kg on Earth. What are the mass and weight of this object on the surface of the Moon where the acceleration due to gravity is only 1/6 of what it is on Earth?

Correct Answerverifiedmass = 60 ...View AnswerShow Answer

You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal.

Correct AnswerverifiedShow Answer

A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator, what would the scale read?

Correct AnswerverifiedShow Answer

A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s. What magnitude force does a 68.0 kg passenger experience during the acceleration?

Correct AnswerverifiedShow Answer

The figure shows an acceleration-versus-force graph for a 125-g object. What should be the value of the first tick-mark on the vertical scale, as indicated by the arrow in the figure?

Correct AnswerverifiedShow Answer

A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?

Correct AnswerverifiedShow Answer

A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then acts on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters. What is the magnitude of the force F?

Correct AnswerverifiedShow Answer

An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth?

Correct AnswerverifiedShow Answer

In a certain particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.67 × 10-27 kg. What is the force on the proton?

Correct AnswerverifiedShow Answer

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point

Correct AnswerverifiedShow Answer

The figure shows an acceleration-versus-force graph for three objects pulled by wires. If the mass of object 2 is 36 kg, what are the masses of objects 1 and 3?

Correct AnswerverifiedShow Answer

A catcher stops a 0.15-kg ball traveling at 40 m/s in a distance of 20 cm. What is the magnitude of the average force that the ball exerts against his glove?

Correct AnswerverifiedShow Answer

An object of mass m rests on a flat table. The earth pulls on this object with a force of magnitude mg. What is the reaction force to this pull?

Correct AnswerverifiedShow Answer

A girl attaches a rock to a string, which she then swings counter-clockwise in a horizontal circle. The string breaks at point P in the figure, which shows a bird's-eye view (as seen from above) . Which path (A-E) will the rock follow?

Correct AnswerverifiedShow Answer

An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be

Correct AnswerverifiedShow Answer

In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you.

Correct AnswerverifiedShow Answer

What magnitude net force is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in 10.0 s?

Correct AnswerverifiedShow Answer

A satellite is in orbit around the earth. Which one feels the greater force?

Correct AnswerverifiedShow Answer

Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings) , initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start moving away from Bill. Just after Bill stops pushing,

Correct AnswerverifiedShow Answer

On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

Correct AnswerverifiedShow Answer

Correct Answer
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mass = 60 ...
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An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s². How much does she weigh on Earth?

Correct Answer
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In a certain particle accelerator, a proton reaches an acceleration of 9.0 × 10¹³ m/s². The mass of a proton is 1.67 × 10^-27 kg. What is the force on the proton?

Correct Answer
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On its own, a tow truck has a maximum acceleration of 3.0 m/s². What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

Correct Answer
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