Question 1

A 1.5-kg mass has an acceleration of (4.0 2. Only two forces act on the mass. If one of the forces is (2.0   − 1.4   )  N, what is the magnitude of the other force? A)  4.1 N B)  6.1 N C)  5.1 N D)  7.1 N E)  2.4 N" class="answers-bank-image d-inline" rel="preload" > − 3.0 2. Only two forces act on the mass. If one of the forces is (2.0   − 1.4   )  N, what is the magnitude of the other force? A)  4.1 N B)  6.1 N C)  5.1 N D)  7.1 N E)  2.4 N" class="answers-bank-image d-inline" rel="preload" > )  m/s2. Only two forces act on the mass. If one of the forces is (2.0 2. Only two forces act on the mass. If one of the forces is (2.0   − 1.4   )  N, what is the magnitude of the other force? A)  4.1 N B)  6.1 N C)  5.1 N D)  7.1 N E)  2.4 N" class="answers-bank-image d-inline" rel="preload" > − 1.4 2. Only two forces act on the mass. If one of the forces is (2.0   − 1.4   )  N, what is the magnitude of the other force? A)  4.1 N B)  6.1 N C)  5.1 N D)  7.1 N E)  2.4 N" class="answers-bank-image d-inline" rel="preload" > )  N, what is the magnitude of the other force?

Accepted Answer

A)   4.1 N
B)   6.1 N
C)   5.1 N
D)   7.1 N
E)   2.4 NF) C) and D)
G) B) and D)

Question 2

If M = 6.0 kg, what is the tension in string 1?

Accepted Answer

A)   39 N
B)   34 N
C)   29 N
D)   44 N
E)   51 NF) A) and E)
G) C) and D)

Question 3

If F = 8.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless.

Accepted Answer

A)   4.1 N
B)   3.5 N
C)   3.8 N
D)   3.1 N
E)   4.8 NF) C) and D)
G) None of the above

Question 4

A constant force is applied to a body that is already moving. The force is directed at an angle of 60 degrees to the direction of the body's velocity. What is most likely to happen is that

Accepted Answer

A)   the body will stop moving.
B)   the body will move in the direction of the force.
C)   the body's velocity will increase in magnitude but not change direction.
D)   the body will gradually change direction more and more toward that of the force while speeding up.
E)   the body will first stop moving and then move in the direction of the force.F) All of the above
G) A) and B)

Question 5

The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and θ = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?

Accepted Answer

A)   0.44
B)   0.33
C)   0.38
D)   0.28
E)   0.17F) A) and D)
G) A) and E)

Question 6

A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?

Accepted Answer

A)   1.8 m/s2 up the incline
B)   2.3 m/s2 up the incline
C)   6.6 m/s2 down the incline
D)   1.8 m/s2 down the incline
E)   2.3 m/s2 down the inclineF) B) and D)
G) C) and D)

Question 7

A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline. When P is 31 N, it is observed that the block moves up the incline with a constant speed. What value of P would be required to lower the block down the incline at a constant speed?

Accepted Answer

A)   27 N
B)   15 N
C)   13 N
D)   17 N
E)   19 NF) B) and E)
G) A) and B)

Question 8

A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N)  is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block? 2. What is the magnitude of the force of friction acting on the block?   A)  2.0 N B)  1.4 N C)  1.6 N D)  2.8 N E)  3.4 N" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2.0 N
B)   1.4 N
C)   1.6 N
D)   2.8 N
E)   3.4 NF) C) and D)
G) B) and C)

Question 9

A 2.0-kg object has a velocity of 4.0  m/s at t = 0. A constant resultant force of (2.0  + 4.0  )  N then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of the 3.0-s interval?

Accepted Answer

A)   9.2 m/s
B)   6.3 m/s
C)   8.2 m/s
D)   7.2 m/s
E)   7.7 m/sF) A) and E)
G) A) and B)

Question 10

In the figure, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. If F = 14 N and M = 1.0 kg, what is the magnitude of the acceleration of either block? 2 B)  1.3 m/s2 C)  1.5 m/s2 D)  1.8 m/s2 E)  3.5 m/s2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2.0 m/s2
B)   1.3 m/s2
C)   1.5 m/s2
D)   1.8 m/s2
E)   3.5 m/s2F) A) and E)
G) B) and E)

Question 11

The horizontal surface on which the objects slide is frictionless. If F = 12 N, what is the tension in string 1?

Accepted Answer

A)   35 N
B)   30 N
C)   40 N
D)   45 N
E)   25 NF) All of the above
G) None of the above

Question 12

In the figure, if F = 2.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless.

Accepted Answer

A)   2.6 N
B)   1.1 N
C)   2.1 N
D)   1.6 N
E)   3.7 NF) A) and B)
G) D) and E)

Question 13

In the figure shown, the coefficient of kinetic friction between the block and the incline is 0.40. What is the magnitude of the acceleration of the suspended block as it falls? Disregard any pulley mass or friction in the pulley. 2 B)  3.7 m/s2 C)  4.2 m/s2 D)  3.9 m/s2 E)  5.4 m/s2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   3.4 m/s2
B)   3.7 m/s2
C)   4.2 m/s2
D)   3.9 m/s2
E)   5.4 m/s2F) B) and C)
G) A) and B)

Question 14

A block is pushed up a frictionless 30° incline by an applied force as shown. If F = 25 N and M = 3.0 kg, what is the magnitude of the resulting acceleration of the block? 2 B)  4.6 m/s2 C)  3.5 m/s2 D)  2.9 m/s2 E)  5.1 m/s2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2.3 m/s2
B)   4.6 m/s2
C)   3.5 m/s2
D)   2.9 m/s2
E)   5.1 m/s2F) A) and E)
G) A) and B)

Question 15

A box rests on the (horizontal)  back of a truck. The coefficient of static friction between the box and the surface on which it rests is 0.24. What maximum distance can the truck travel (starting from rest and moving horizontally with constant acceleration)  in 3.0 s without having the box slide?

Accepted Answer

A)   14 m
B)   11 m
C)   19 m
D)   24 m
E)   29 mF) A) and B)
G) D) and E)

Question 16

Three boxes are pushed across a frictionless horizontal surface as shown. When we compare the normal force N2,5 that mass 2m exerts on mass 5m with the normal force N5,10 that mass 5m exerts on mass 10m, we find that 2,5 that mass 2m exerts on mass 5m with the normal force N5,10 that mass 5m exerts on mass 10m, we find that   A)  N2,5 = N5,10 = F. B)  N2,5 = F > N5,10. C)  F > N2,5 = N5,10. D)  F > N2,5 > N5,10. E)  F > N5,10 > N2,5." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   N2,5 = N5,10 = F.
B)   N2,5 = F > N5,10.
C)   F > N2,5 = N5,10.
D)   F > N2,5 > N5,10.
E)   F > N5,10 > N2,5.F) B) and D)
G) A) and B)

Question 17

If F = 40 N and M = 2.0 kg, what is the magnitude of the acceleration of the suspended object? All surfaces are frictionless. 2 B)  2.0 m/s2 C)  1.5 m/s2 D)  2.5 m/s2 E)  5.6 m/s2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1.2 m/s2
B)   2.0 m/s2
C)   1.5 m/s2
D)   2.5 m/s2
E)   5.6 m/s2F) A) and C)
G) B) and E)

Question 18

At an instant when a 4.0-kg object has an acceleration equal to 2, one of the two forces acting on the object is known to be   N. Determine the magnitude of the other force acting on the object. A)  2.0 N B)  13 N C)  18 N D)  1.7 N E)  20 N" class="answers-bank-image d-inline" rel="preload" > m/s2, one of the two forces acting on the object is known to be 2, one of the two forces acting on the object is known to be   N. Determine the magnitude of the other force acting on the object. A)  2.0 N B)  13 N C)  18 N D)  1.7 N E)  20 N" class="answers-bank-image d-inline" rel="preload" > N. Determine the magnitude of the other force acting on the object.

Accepted Answer

A)   2.0 N
B)   13 N
C)   18 N
D)   1.7 N
E)   20 NF) A) and E)
G) A) and D)

Question 19

A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2. What is the tension in the string?

Accepted Answer

A)   49 N
B)   36 N
C)   62 N
D)   13 N
E)   52 NF) A) and C)
G) C) and D)

Question 20

If the tension, T, is 15 N and the magnitude of the acceleration, a, is 3.0 m/s2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless. 2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless.   A)  3.1 kg B)  2.5 kg C)  2.8 kg D)  2.2 kg E)  3.7 kg" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   3.1 kg
B)   2.5 kg
C)   2.8 kg
D)   2.2 kg
E)   3.7 kgF) A) and B)
G) D) and E)

Exam 5: The Laws of Motion

If F = 40 N and M = 2.0 kg, what is the magnitude of the acceleration of the suspended object? All surfaces are frictionless.

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A 2.0-kg object has a velocity of 4.0 m/s at t = 0. A constant resultant force of (2.0 + 4.0 ) N then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of the 3.0-s interval?

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A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline. When P is 31 N, it is observed that the block moves up the incline with a constant speed. What value of P would be required to lower the block down the incline at a constant speed?

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In the figure shown, the coefficient of kinetic friction between the block and the incline is 0.40. What is the magnitude of the acceleration of the suspended block as it falls? Disregard any pulley mass or friction in the pulley.

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The horizontal surface on which the objects slide is frictionless. If F = 12 N, what is the tension in string 1?

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A constant force is applied to a body that is already moving. The force is directed at an angle of 60 degrees to the direction of the body's velocity. What is most likely to happen is that

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A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?

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At an instant when a 4.0-kg object has an acceleration equal to m/s2, one of the two forces acting on the object is known to be N. Determine the magnitude of the other force acting on the object.

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If the tension, T, is 15 N and the magnitude of the acceleration, a, is 3.0 m/s2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless.

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A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2. What is the tension in the string?

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A block is pushed up a frictionless 30° incline by an applied force as shown. If F = 25 N and M = 3.0 kg, what is the magnitude of the resulting acceleration of the block?

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The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and θ = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?

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A box rests on the (horizontal) back of a truck. The coefficient of static friction between the box and the surface on which it rests is 0.24. What maximum distance can the truck travel (starting from rest and moving horizontally with constant acceleration) in 3.0 s without having the box slide?

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Three boxes are pushed across a frictionless horizontal surface as shown. When we compare the normal force N2,5 that mass 2m exerts on mass 5m with the normal force N5,10 that mass 5m exerts on mass 10m, we find that

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A 1.5-kg mass has an acceleration of (4.0 − 3.0 ) m/s2. Only two forces act on the mass. If one of the forces is (2.0 − 1.4 ) N, what is the magnitude of the other force?

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If M = 6.0 kg, what is the tension in string 1?

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If F = 8.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless.

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In the figure, if F = 2.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless.

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In the figure, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. If F = 14 N and M = 1.0 kg, what is the magnitude of the acceleration of either block?

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A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block?

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At an instant when a 4.0-kg object has an acceleration equal to m/s², one of the two forces acting on the object is known to be N. Determine the magnitude of the other force acting on the object.

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If the tension, T, is 15 N and the magnitude of the acceleration, a, is 3.0 m/s², what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless.

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A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s². What is the tension in the string?

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Three boxes are pushed across a frictionless horizontal surface as shown. When we compare the normal force N_2,5 that mass 2m exerts on mass 5m with the normal force N_5,10 that mass 5m exerts on mass 10m, we find that

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A 1.5-kg mass has an acceleration of (4.0 − 3.0 ) m/s². Only two forces act on the mass. If one of the forces is (2.0 − 1.4 ) N, what is the magnitude of the other force?

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A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s². What is the magnitude of the force of friction acting on the block?

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