Question 1

Acceleration is always in the direction:

Accepted Answer

A)  of the displacement 
B)  of the initial velocity 
C)  of the final velocity 
D)  of the net force 
E)  opposite to the frictional force 
A)  of the displacement 
B)  of the initial velocity 
C)  of the final velocity 
D)  of the net force 
E)  opposite to the frictional force

Question 2

A sled is on an icy (frictionless) slope that is 30$\degree$ above the horizontal. When a 40-N force, parallel to the incline and directed up the incline, is applied to the sled, the acceleration of the sled is 2.0 m/s2, down the incline. The mass of the sled is:

Accepted Answer

A)  4.1 kg 
B)  6.2 kg 
C)  8.1 kg 
D)  10 kg 
E)  14 kg 
A)  4.1 kg 
B)  6.2 kg 
C)  8.1 kg 
D)  10 kg 
E)  14 kg

Question 3

The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is:

Accepted Answer

A)  0 N 
B)  2 N, leftward 
C)  2 N, rightward 
D)  slightly more than 2 N, leftward 
E)  slightly less than 2 N, leftward 
A)  0 N 
B)  2 N, leftward 
C)  2 N, rightward 
D)  slightly more than 2 N, leftward 
E)  slightly less than 2 N, leftward

Question 4

A motionless 400-N steel ball is suspended by a light rope from the ceiling. The tension in the rope is:

Accepted Answer

A)  400 N 
B)  800 N 
C)  0 N 
D)  200 N 
E)  560 N 
A)  400 N 
B)  800 N 
C)  0 N 
D)  200 N 
E)  560 N

Question 5

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30$\degree$ above the horizontal. The mass of the crate is:

Accepted Answer

A)  3.3 kg 
B)  3.8 kg 
C)  5.7 kg 
D)  6.5 kg 
E)  160 kg 
A)  3.3 kg 
B)  3.8 kg 
C)  5.7 kg 
D)  6.5 kg 
E)  160 kg

Question 6

An object moving at constant velocity in an inertial frame must:

Accepted Answer

A)  have a net force on it 
B)  eventually stop due to gravity 
C)  not have any force of gravity acting on it 
D)  have zero net force acting on it 
E)  have no frictional force acting on it 
A)  have a net force on it 
B)  eventually stop due to gravity 
C)  not have any force of gravity acting on it 
D)  have zero net force acting on it 
E)  have no frictional force acting on it

Question 7

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

Accepted Answer

A)  anything falling in vacuum has constant velocity 
B)  all objects reach the same terminal velocity 
C)  the acceleration of the larger object is three times greater than that of the smaller object 
D)  the force of gravity is the same for both objects 
E)  none of the above 
A)  anything falling in vacuum has constant velocity 
B)  all objects reach the same terminal velocity 
C)  the acceleration of the larger object is three times greater than that of the smaller object 
D)  the force of gravity is the same for both objects 
E)  none of the above

Question 8

A massless rope passes over a massless pulley suspended from the ceiling. A 4-kg block is attached to one end and a 5-kg block is attached to the other end. The acceleration of the 5-kg block is:

Accepted Answer

A)  g/4 
B)  5g/9 
C)  4g/9 
D)  g/5 
E)  g/9 
A)  g/4 
B)  5g/9 
C)  4g/9 
D)  g/5 
E)  g/9

Question 9

A 1-N pendulum bob is held at an angle $\theta$from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob is:

Accepted Answer

A)  2/N 
B)  2 N 
C)  N 
D)  1 N 
E)  none of these 
A)  2/N 
B)  2 N 
C)  N 
D)  1 N 
E)  none of these

Question 10

A newton is the force:

Accepted Answer

A)  of gravity on a 1 kg body 
B)  of gravity on a 1 g body 
C)  that gives a l g body an acceleration of 1 cm/s2 
D)  that gives a 1 kg body an acceleration of 1 m/s2 
E)  that gives a 1 kg body an acceleration of 9.8 m/s2 
A)  of gravity on a 1 kg body 
B)  of gravity on a 1 g body 
C)  that gives a l g body an acceleration of 1 cm/s2 
D)  that gives a 1 kg body an acceleration of 1 m/s2 
E)  that gives a 1 kg body an acceleration of 9.8 m/s2

Question 11

Three books (X, Y, and Z) rest on a table. The weight of each book is indicated. The net force acting on book Y is:

Accepted Answer

A)  4 N down 
B)  5 N up 
C)  9 N down 
D)  0 N 
E)  none of these 
A)  4 N down 
B)  5 N up 
C)  9 N down 
D)  0 N 
E)  none of these

Question 12

A ball with a weight of 1.5 N is thrown at an angle of 30$\degree$ above the horizontal with an initial speed of 12 m/s. At its highest point, the net force on the ball is:

Accepted Answer

A)  9.8 N, 30$\degree$ below horizontal 
B)  0 N 
C)  9.8 N, up 
D)  9.8 N, down 
E)  1.5 N, down 
A)  9.8 N, 30$\degree$ below horizontal 
B)  0 N 
C)  9.8 N, up 
D)  9.8 N, down 
E)  1.5 N, down

Question 13

The unit of force called the newton is:

Accepted Answer

A)  the force needed to accelerate a mass of 1 kg at a rate of 9.8 m/s2 
B)  the force needed to accelerate a mass of 1 kg at a rate of 1 m/s2 
C)  defined by means of Newton's third law 
D)  1 kg of mass 
E)  1 kg of force 
A)  the force needed to accelerate a mass of 1 kg at a rate of 9.8 m/s2 
B)  the force needed to accelerate a mass of 1 kg at a rate of 1 m/s2 
C)  defined by means of Newton's third law 
D)  1 kg of mass 
E)  1 kg of force

Question 14

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest. The change in speed of this object will be:

Accepted Answer

A)  0.5 m/s 
B)  2 m/s 
C)  4 m/s 
D)  8 m/s 
E)  32 m/s 
A)  0.5 m/s 
B)  2 m/s 
C)  4 m/s 
D)  8 m/s 
E)  32 m/s

Question 15

A heavy steel ball B is suspended by a cord from a block of wood W. The entire system is dropped through the air. Neglecting air resistance, the tension in the cord is:

Accepted Answer

A)  zero 
B)  the difference in the masses of B and W 
C)  the difference in the weights of B and W 
D)  the weight of B 
E)  none of these 
A)  zero 
B)  the difference in the masses of B and W 
C)  the difference in the weights of B and W 
D)  the weight of B 
E)  none of these

Question 16

When a 40-N force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30$\degree$ above the horizontal, the acceleration of the crate is 2.0 m/s2, up the incline. The mass of the crate is:

Accepted Answer

A)  3.8 kg 
B)  4.1 kg 
C)  5.8 kg 
D)  6.2 kg 
E)  10 kg 
A)  3.8 kg 
B)  4.1 kg 
C)  5.8 kg 
D)  6.2 kg 
E)  10 kg

Question 17

An object placed on an equal-arm balance requires 12 kg to balance it. When placed on a spring scale, the scale reads 12 kg. Everything (balance, scale, set of weights and object) is now transported to the Moon where free-fall acceleration is one-sixth that on Earth. The new readings of the balance and spring scale (respectively) are:

Accepted Answer

A)  12 kg, 12 kg 
B)  2 kg, 2 kg 
C)  12 kg, 2 kg 
D)  2 kg, 12 kg 
E)  12 kg, 72 kg 
A)  12 kg, 12 kg 
B)  2 kg, 2 kg 
C)  12 kg, 2 kg 
D)  2 kg, 12 kg 
E)  12 kg, 72 kg

Question 18

Which of the following quantities is NOT a vector?

Accepted Answer

A)  Mass 
B)  Displacement 
C)  Weight 
D)  Acceleration 
E)  Force 
A)  Mass 
B)  Displacement 
C)  Weight 
D)  Acceleration 
E)  Force

Question 19

Three books (X, Y, and Z) rest on a table. The weight of each book is indicated. The force of book Z on book Y is:

Accepted Answer

A)  0 N 
B)  5 N 
C)  9 N 
D)  14 N 
E)  19 N 
A)  0 N 
B)  5 N 
C)  9 N 
D)  14 N 
E)  19 N

Question 20

A feather and a lead ball are dropped from rest in vacuum on the Moon. The acceleration of the feather is:

Accepted Answer

A)  more than that of the lead ball 
B)  the same as that of the lead ball 
C)  less than that of the lead ball 
D)  9.8 m/s2 
E)  zero since it floats in a vacuum 
A)  more than that of the lead ball 
B)  the same as that of the lead ball 
C)  less than that of the lead ball 
D)  9.8 m/s2 
E)  zero since it floats in a vacuum

Exam 5: Force and Motion I

Acceleration is always in the direction:

A sled is on an icy (frictionless) slope that is 30 °\degree° above the horizontal. When a 40-N force, parallel to the incline and directed up the incline, is applied to the sled, the acceleration of the sled is 2.0 m/s2, down the incline. The mass of the sled is:

The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is:

A motionless 400-N steel ball is suspended by a light rope from the ceiling. The tension in the rope is:

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 °\degree° above the horizontal. The mass of the crate is:

An object moving at constant velocity in an inertial frame must:

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

A massless rope passes over a massless pulley suspended from the ceiling. A 4-kg block is attached to one end and a 5-kg block is attached to the other end. The acceleration of the 5-kg block is:

A 1-N pendulum bob is held at an angle θ\thetaθ from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob is:

A newton is the force:

Three books (X, Y, and Z) rest on a table. The weight of each book is indicated. The net force acting on book Y is:

A ball with a weight of 1.5 N is thrown at an angle of 30 °\degree° above the horizontal with an initial speed of 12 m/s. At its highest point, the net force on the ball is:

The unit of force called the newton is:

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest. The change in speed of this object will be:

A heavy steel ball B is suspended by a cord from a block of wood W. The entire system is dropped through the air. Neglecting air resistance, the tension in the cord is:

When a 40-N force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30 °\degree° above the horizontal, the acceleration of the crate is 2.0 m/s2, up the incline. The mass of the crate is:

Which of the following quantities is NOT a vector?

Three books (X, Y, and Z) rest on a table. The weight of each book is indicated. The force of book Z on book Y is:

A feather and a lead ball are dropped from rest in vacuum on the Moon. The acceleration of the feather is:

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A sled is on an icy (frictionless) slope that is 30 $\degree$ above the horizontal. When a 40-N force, parallel to the incline and directed up the incline, is applied to the sled, the acceleration of the sled is 2.0 m/s², down the incline. The mass of the sled is:

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 $\degree$ above the horizontal. The mass of the crate is:

A ball with a weight of 1.5 N is thrown at an angle of 30 $\degree$ above the horizontal with an initial speed of 12 m/s. At its highest point, the net force on the ball is:

When a 40-N force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30 $\degree$ above the horizontal, the acceleration of the crate is 2.0 m/s², up the incline. The mass of the crate is: