Question 1

If P = 6.0 N,what is the magnitude of the force exerted on block 1 by block 2?

Accepted Answer

A) 6.4 N 
B) 5.6 N 
C) 4.8 N 
D) 7.2 N 
E) 8.4 N 
A) 6.4 N 
B) 5.6 N 
C) 4.8 N 
D) 7.2 N 
E) 8.4 N C

Question 2

A 1.0-kg block is pushed up a rough 22° inclined plane by a force of 7.0 N acting parallel to the incline.The acceleration of the block is 1.4 m/s2 up the incline.Determine the magnitude of the force of friction acting on the block.

Accepted Answer

A) 1.9 N 
B) 2.2 N 
C) 1.3 N 
D) 1.6 N 
E) 3.3 N 
A) 1.9 N 
B) 2.2 N 
C) 1.3 N 
D) 1.6 N 
E) 3.3 N A

Question 3

A 1.5-kg object has a velocity of 5  
M/s at t = 0.It is accelerated at a constant rate for five seconds after which it has a velocity of (6  
+ 12  
)m/s.What is the direction of the resultant force acting on the object during this time interval?

Accepted Answer

A) 65° 
B) 56° 
C) 61° 
D) 49° 
E) 27° 
A) 65° 
B) 56° 
C) 61° 
D) 49° 
E) 27° D

Question 4

A box is dropped onto a conveyor belt moving at 2 m/s.If the coefficient of friction between the box and the belt is 0.3,how long before the box moves without slipping?

Accepted Answer

The answer of A box is dropped onto a conveyor...

Question 5

You hold a tennis racket in your hand.On top of the racket you have balanced a ball.Which statement is true?

Accepted Answer

A) The force of your hand on the racket and the force of the ball on the racket are equal and opposite. 
B) The force of the racket on your hand and the force of the ball on the racket are equal and opposite. 
C) The force of your hand on the racket and the force of the racket on the ball are equal and opposite. 
D) The force of the racket on your hand and the force of the racket on the ball are equal and opposite. 
E) The force of your hand on the racket and the force of the racket on your hand are equal and opposite. 
A) The force of your hand on the racket and the force of the ball on the racket are equal and opposite. 
B) The force of the racket on your hand and the force of the ball on the racket are equal and opposite. 
C) The force of your hand on the racket and the force of the racket on the ball are equal and opposite. 
D) The force of the racket on your hand and the force of the racket on the ball are equal and opposite. 
E) The force of your hand on the racket and the force of the racket on your hand are equal and opposite.

Question 6

The system shown is released from rest and moves 50 cm in 1.0 s.What is the value of M? All surfaces are frictionless.

Accepted Answer

A) 0.42 kg 
B) 0.34 kg 
C) 0.50 kg 
D) 0.59 kg 
E) 0.68 kg 
A) 0.42 kg 
B) 0.34 kg 
C) 0.50 kg 
D) 0.59 kg 
E) 0.68 kg

Question 7

Two bodies,A and B,collide as shown in Figures I and II below.  
Which statement is true?

Accepted Answer

A) They exert equal and opposite forces on each other in I but not in II. 
B) They exert equal and opposite force on each other in II but not in I. 
C) They exert equal and opposite force on each other in both I and II. 
D) The forces are equal and opposite to each other in I,but only the components of the forces parallel to the velocities are equal in II. 
E) The forces are equal and opposite in I,but only the components of the forces perpendicular to the velocities are equal in II 
A) They exert equal and opposite forces on each other in I but not in II. 
B) They exert equal and opposite force on each other in II but not in I. 
C) They exert equal and opposite force on each other in both I and II. 
D) The forces are equal and opposite to each other in I,but only the components of the forces parallel to the velocities are equal in II. 
E) The forces are equal and opposite in I,but only the components of the forces perpendicular to the velocities are equal in II

Question 8

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) 0.17 
A) 0.44 
B) 0.33 
C) 0.38 
D) 0.28 
E) 0.17

Question 9

A 1.8-kg block is released from rest at the top of a rough 30° inclined plane.As the block slides down the incline,its acceleration is 3.0 m/s2 down the incline.Determine the magnitude of the force of friction acting on the block.

Accepted Answer

A) 4.2 N 
B) 3.0 N 
C) 3.4 N 
D) 3.8 N 
E) 2.3 N 
A) 4.2 N 
B) 3.0 N 
C) 3.4 N 
D) 3.8 N 
E) 2.3 N

Question 10

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2.What is the magnitude of the force the object exerts on the floor of the elevator?

Accepted Answer

A) 59 N 
B) 10 N 
C) 89 N 
D) 68 N 
E) 78 N 
A) 59 N 
B) 10 N 
C) 89 N 
D) 68 N 
E) 78 N

Question 11

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?

Accepted Answer

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

Question 12

A constant force F is applied to a body of mass m that initially is headed east at velocity v0 until its velocity becomes −v0.The total time of travel is 2t.The total distance the body travels in that time is

Accepted Answer

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

Question 13

Two blocks are accelerated across a horizontal frictionless surface as shown.Frictional forces keep the two blocks from sliding relative to each other,and the two move with the same acceleration.If F = 1.2 N and M = 1.0 kg,what is the horizontal component (frictional force)of the force of the large block on the small block?

Accepted Answer

A) 0.40 N to the left 
B) 0.80 N to the right 
C) 0.40 N to the right 
D) 0.80 N to the left 
E) 1.20 N to the left 
A) 0.40 N to the left 
B) 0.80 N to the right 
C) 0.40 N to the right 
D) 0.80 N to the left 
E) 1.20 N to the left

Question 14

A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline.What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?

Accepted Answer

A) 14 N 
B) 12 N 
C) 16 N 
D) 18 N 
E) 25 N 
A) 14 N 
B) 12 N 
C) 16 N 
D) 18 N 
E) 25 N

Question 15

The horizontal surface on which the objects slide is frictionless.If F = 6.0 N and M = 1.0 kg,what is the magnitude of the force exerted on the large block by the small block?

Accepted Answer

A) 7.7 N 
B) 9.8 N 
C) 9.1 N 
D) 8.4 N 
E) 6.5 N 
A) 7.7 N 
B) 9.8 N 
C) 9.1 N 
D) 8.4 N 
E) 6.5 N

Question 16

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

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

Question 17

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. 
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.

Question 18

A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2.Determine the tension in the string.

Accepted Answer

A) 11 N 
B) 70 N 
C) 48 N 
D) 59 N 
E) 62 N 
A) 11 N 
B) 70 N 
C) 48 N 
D) 59 N 
E) 62 N

Question 19

A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2.What is the magnitude of the force of the elevator floor on the person?

Accepted Answer

A) 0.11 kN 
B) 0.81 kN 
C) 0.70 kN 
D) 0.59 kN 
E) 0.64 kN 
A) 0.11 kN 
B) 0.81 kN 
C) 0.70 kN 
D) 0.59 kN 
E) 0.64 kN

Question 20

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 N 
A) 35 N 
B) 30 N 
C) 40 N 
D) 45 N 
E) 25 N

Exam 5: The Laws of Motion

If P = 6.0 N,what is the magnitude of the force exerted on block 1 by block 2?

A 1.0-kg block is pushed up a rough 22° inclined plane by a force of 7.0 N acting parallel to the incline.The acceleration of the block is 1.4 m/s2 up the incline.Determine the magnitude of the force of friction acting on the block.

A 1.5-kg object has a velocity of 5 M/s at t = 0.It is accelerated at a constant rate for five seconds after which it has a velocity of (6 + 12 )m/s.What is the direction of the resultant force acting on the object during this time interval?

A box is dropped onto a conveyor belt moving at 2 m/s.If the coefficient of friction between the box and the belt is 0.3,how long before the box moves without slipping?

You hold a tennis racket in your hand.On top of the racket you have balanced a ball.Which statement is true?

The system shown is released from rest and moves 50 cm in 1.0 s.What is the value of M? All surfaces are frictionless.

Two bodies,A and B,collide as shown in Figures I and II below. Which statement is true?

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?

A 1.8-kg block is released from rest at the top of a rough 30° inclined plane.As the block slides down the incline,its acceleration is 3.0 m/s2 down the incline.Determine the magnitude of the force of friction acting on the block.

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2.What is the magnitude of the force the object exerts on the floor of the elevator?

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?

A constant force F is applied to a body of mass m that initially is headed east at velocity v0 until its velocity becomes −v0.The total time of travel is 2t.The total distance the body travels in that time is

A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline.What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?

The horizontal surface on which the objects slide is frictionless.If F = 6.0 N and M = 1.0 kg,what is the magnitude of the force exerted on the large block by the small block?

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

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

A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2.Determine the tension in the string.

A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2.What is the magnitude of the force of the elevator floor on the person?

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

Physics and Measurement

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A 1.0-kg block is pushed up a rough 22° inclined plane by a force of 7.0 N acting parallel to the incline.The acceleration of the block is 1.4 m/s² up the incline.Determine the magnitude of the force of friction acting on the block.

A 1.8-kg block is released from rest at the top of a rough 30° inclined plane.As the block slides down the incline,its acceleration is 3.0 m/s² down the incline.Determine the magnitude of the force of friction acting on the block.

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s².What is the magnitude of the force the object exerts on the floor of the elevator?

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?

A constant force F is applied to a body of mass m that initially is headed east at velocity v₀ until its velocity becomes −v₀.The total time of travel is 2t.The total distance the body travels in that time is

A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s².Determine the tension in the string.

A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s².What is the magnitude of the force of the elevator floor on the person?