Question 1

A horse exerts a force F on a cart, causing the cart to move with increasing speed. What force does the cart exert on the horse?

Accepted Answer

A)   zero
B)   F
C)   greater than F
D)   less than F
E)   The force cannot be determined unless the acceleration is given.

Question 2

A mass 2m is attached by a string to another mass m as illustrated. A force of  newtons acts on mass m to accelerate the system. The force  in the string, which acts on mass 2m, is

Accepted Answer

A)   2/3) N.
B)   N.
C)   2N.
D)   3N.
E)   3/2) N.

Question 3

The SI unit of force is the

Accepted Answer

A)   newton.
B)   gram.
C)   pound.
D)   kilogram.
E)   None of these is correct.

Question 4

A net force is exerted on an object toward the north. The object

Accepted Answer

A)   is moving toward the north.
B)   is moving toward the east.
C)   is moving toward the west.
D)   is moving toward the south.
E)   may be moving in any direction.

Question 5

The acceleration due to gravity on the Moon is only about 1/6 of that on Earth. An astronaut whose weight on Earth is 600 N travels to the lunar surface. His mass as measured on the Moon is

Accepted Answer

A)   600 kg.
B)   100 kg.
C)   61.2 kg.
D)   10.0 kg.
E)   360 kg.

Question 6

An astronaut lands on an Earthlike planet and drops a small lead ball with a mass of 76.5 g from the top of her spaceship. The point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground. The astronaut's mass on Earth is 68.5 kg. Her mass on the planet is

Accepted Answer

A)   68.5 kg.
B)   395 kg.
C)   670 kg,
D)   99.0 kg.
E)   40.2 kg.

Question 7

Which of the following free-body diagrams represents the block sliding down a frictionless inclined plane?

Accepted Answer

A)   1) 
B)   2) 
C)   3) 
D)   4) 
E)   5)

Question 8

A horse-drawn coach is decelerating at 3.0 m/s2 while moving in a straight line horizontally. A 350-g mass is hanging on a string 1.6 m long from the ceiling of the coach. The angle that the string makes with the vertical is

Accepted Answer

A)   9.3o toward the front of the coach.
B)   17o toward the front of the coach.
C)   9.3o toward the back of the coach.
D)   2.5o toward the front of the coach.
E)   0o, or straight down.

Question 9

The diagrams below show the application of a net force F on a block of mass m.  Which diagrams)  produces the largest acceleration on the block in the horizontal direction?

Accepted Answer

A)   1)  and 3) 
B)   2) 
C)   3) 
D)   2)  and 4) 
E)   The acceleration is the same for all four.

Question 10

A boy holds a bird in his hand. The reaction force to the weight of the bird is the force of the

Accepted Answer

A)   Earth on the bird.
B)   bird on the Earth.
C)   hand on the bird.
D)   bird on the hand.
E)   Earth on the hand.

Question 11

1 = 2m2 = 3m3, with m1 on the left and m3 on the right. If the pulling force is equal to 90 N, then the tension in the cord between m1 and m2 is A)  49 N. B)  15 N. C)  100 N. D)  44 N. E)  85 N." class="answers-bank-image d-inline" rel="preload" > Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m1 = 2m2 = 3m3, with m1 on the left and m3 on the right. If the pulling force is equal to 90 N, then the tension in the cord between m1 and m2 is

Accepted Answer

A)   49 N.
B)   15 N.
C)   100 N.
D)   44 N.
E)   85 N.

Question 12

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

Accepted Answer

A)   2)  
A)     . 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .
B)   2)  
A)     . 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .
C)   2)  
A)     . 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .
D)   2)  
A)     . 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .
E)   2)  
A)     . 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .

Question 13

Three forces, o to the north of east, and   = 4.0 N acting 30o to the north of west.The direction of the net acceleration A)  cannot be determined because the acceleration is zero. B)  is 60o north of east. C)  is 70 o north of east. D)  is 51 o north of east. E)  is 44 o north of east." class="answers-bank-image d-inline" rel="preload" > , o to the north of east, and   = 4.0 N acting 30o to the north of west.The direction of the net acceleration A)  cannot be determined because the acceleration is zero. B)  is 60o north of east. C)  is 70 o north of east. D)  is 51 o north of east. E)  is 44 o north of east." class="answers-bank-image d-inline" rel="preload" > , and o to the north of east, and   = 4.0 N acting 30o to the north of west.The direction of the net acceleration A)  cannot be determined because the acceleration is zero. B)  is 60o north of east. C)  is 70 o north of east. D)  is 51 o north of east. E)  is 44 o north of east." class="answers-bank-image d-inline" rel="preload" > , act on a mass of 4.2 kg. The forces are o to the north of east, and   = 4.0 N acting 30o to the north of west.The direction of the net acceleration A)  cannot be determined because the acceleration is zero. B)  is 60o north of east. C)  is 70 o north of east. D)  is 51 o north of east. E)  is 44 o north of east." class="answers-bank-image d-inline" rel="preload" > = 2.0 N acting to the east, o to the north of east, and   = 4.0 N acting 30o to the north of west.The direction of the net acceleration A)  cannot be determined because the acceleration is zero. B)  is 60o north of east. C)  is 70 o north of east. D)  is 51 o north of east. E)  is 44 o north of east." class="answers-bank-image d-inline" rel="preload" > = 5.0 N acting 45o to the north of east, and o to the north of east, and   = 4.0 N acting 30o to the north of west.The direction of the net acceleration A)  cannot be determined because the acceleration is zero. B)  is 60o north of east. C)  is 70 o north of east. D)  is 51 o north of east. E)  is 44 o north of east." class="answers-bank-image d-inline" rel="preload" > = 4.0 N acting 30o to the north of west.The direction of the net acceleration

Accepted Answer

A)   cannot be determined because the acceleration is zero.
B)   is 60o north of east.
C)   is 70 o north of east.
D)   is 51 o north of east.
E)   is 44 o north of east.

Question 14

You are riding an elevator that is in motion. Using a spring balance calibrated in newtons, you notice that a 10.0 kg hanging mass reads 120 N on the scale. What is the acceleration of the elevator?

Accepted Answer

A)   9.8 m/s2 downward
B)   4.9 m/s2 upward
C)   2.2 m/s2 downward
D)   2.2 m/s2 upward
E)   1.1 m/s2 downward

Question 15

A ball of mass 2.0 kg is acted on by two forces,  , and  . The direction of the acceleration vector  )  w.r.t to the +x-axis is

Accepted Answer

A)    .
B)    .
C)    .
D)    .
E)    .

Question 16

A force accelerates a body of mass M. The same force applied to a second body produces three times the acceleration. What is the mass of the second body?

Accepted Answer

A)   M
B)   3M
C)   M/3
D)   9M
E)   M/9

Question 17

A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest. The tension in the rope needed to give the object an upward speed of 3.50 m/s in 0.700 s is

Accepted Answer

A)   592 N.
B)   390 N.
C)   200 N.
D)   980 N.
E)   720 N.

Question 18

A large 15,000-kg)  stationary military helicopter lifts a 6000-kg truck straight up out of a danger zone with an acceleration of 4 m/s2. Calculate the tension in the lifting cable.

Accepted Answer

A)   3.5 *104 N
B)   8.3 *104 N
C)   2.1 * 102 N
D)   5.9 * 104 N
E)   2.4 * 104 N

Question 19

A boy holds a bird in his hand. The reaction force to the normal force exerted on the bird by the boy's hand is the force of

Accepted Answer

A)   the Earth on the bird.
B)   the bird on the Earth.
C)   the hand on the bird.
D)   the bird on the hand.
E)   the Earth on the hand.

Question 20

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 smallest normal force?

Accepted Answer

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

Exam 4: Forces and Motion I: Newtons Laws

The acceleration due to gravity on the Moon is only about 1/6 of that on Earth. An astronaut whose weight on Earth is 600 N travels to the lunar surface. His mass as measured on the Moon is

Correct AnswerverifiedShow Answer

The SI unit of force is the

Correct AnswerverifiedShow Answer

The diagrams below show the application of a net force F on a block of mass m. Which diagrams) produces the largest acceleration on the block in the horizontal direction?

Correct AnswerverifiedShow Answer

Which of the following free-body diagrams represents the block sliding down a frictionless inclined plane?

Correct AnswerverifiedShow Answer

A large 15,000-kg) stationary military helicopter lifts a 6000-kg truck straight up out of a danger zone with an acceleration of 4 m/s2. Calculate the tension in the lifting cable.

Correct AnswerverifiedShow Answer

A ball of mass 2.0 kg is acted on by two forces, , and . The direction of the acceleration vector ) w.r.t to the +x-axis is

Correct AnswerverifiedShow Answer

A net force is exerted on an object toward the north. The object

Correct AnswerverifiedShow Answer

A horse-drawn coach is decelerating at 3.0 m/s2 while moving in a straight line horizontally. A 350-g mass is hanging on a string 1.6 m long from the ceiling of the coach. The angle that the string makes with the vertical is

Correct AnswerverifiedShow Answer

Three forces, , , and , act on a mass of 4.2 kg. The forces are = 2.0 N acting to the east, = 5.0 N acting 45o to the north of east, and = 4.0 N acting 30o to the north of west.The direction of the net acceleration

Correct AnswerverifiedShow Answer

A ball of mass 2.0 kg is acted on by two forces , and . The acceleration vector, , of the mass is in m/s2)

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A mass 2m is attached by a string to another mass m as illustrated. A force of newtons acts on mass m to accelerate the system. The force in the string, which acts on mass 2m, is

Correct AnswerverifiedShow Answer

A boy holds a bird in his hand. The reaction force to the normal force exerted on the bird by the boy's hand is the force of

Correct AnswerverifiedShow Answer

An astronaut lands on an Earthlike planet and drops a small lead ball with a mass of 76.5 g from the top of her spaceship. The point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground. The astronaut's mass on Earth is 68.5 kg. Her mass on the planet is

Correct AnswerverifiedShow Answer

A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest. The tension in the rope needed to give the object an upward speed of 3.50 m/s in 0.700 s is

Correct AnswerverifiedShow Answer

You are riding an elevator that is in motion. Using a spring balance calibrated in newtons, you notice that a 10.0 kg hanging mass reads 120 N on the scale. What is the acceleration of the elevator?

Correct AnswerverifiedShow Answer

A horse exerts a force F on a cart, causing the cart to move with increasing speed. What force does the cart exert on the horse?

Correct AnswerverifiedShow Answer

A boy holds a bird in his hand. The reaction force to the weight of the bird is the force of the

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 smallest normal force?

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A force accelerates a body of mass M. The same force applied to a second body produces three times the acceleration. What is the mass of the second body?

Correct AnswerverifiedShow Answer

Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m1 = 2m2 = 3m3, with m1 on the left and m3 on the right. If the pulling force is equal to 90 N, then the tension in the cord between m1 and m2 is

Correct AnswerverifiedShow Answer

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A large 15,000-kg) stationary military helicopter lifts a 6000-kg truck straight up out of a danger zone with an acceleration of 4 m/s². Calculate the tension in the lifting cable.

Correct Answer
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A horse-drawn coach is decelerating at 3.0 m/s² while moving in a straight line horizontally. A 350-g mass is hanging on a string 1.6 m long from the ceiling of the coach. The angle that the string makes with the vertical is

Correct Answer
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Three forces, , , and , act on a mass of 4.2 kg. The forces are = 2.0 N acting to the east, = 5.0 N acting 45^o to the north of east, and = 4.0 N acting 30^o to the north of west.The direction of the net acceleration

Correct Answer
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A ball of mass 2.0 kg is acted on by two forces , and . The acceleration vector, , of the mass is in m/s²)

Correct Answer
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Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m₁ = 2m₂ = 3m₃, with m₁ on the left and m₃ on the right. If the pulling force is equal to 90 N, then the tension in the cord between m₁ and m₂ is

Correct Answer
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