Question 1

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 2

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 3

A lead block is suspended from your hand by a string.The reaction to the force of gravity on the block is the force exerted by the:

Accepted Answer

A) string on the block 
B) block on the string 
C) string on the hand 
D) hand on the string 
E) block on the Earth 
A) string on the block 
B) block on the string 
C) string on the hand 
D) hand on the string 
E) block on the Earth

Question 4

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 5

Equal forces   act on isolated bodies A and B.The mass of B is three times that of A.The magnitude of the acceleration of A is:

Accepted Answer

A) three times that of B 
B) 1/3 that of B 
C) the same as B 
D) nine times that of B 
E) 1/9 that of B 
A) three times that of B 
B) 1/3 that of B 
C) the same as B 
D) nine times that of B 
E) 1/9 that of B

Question 6

A 90-kg man stands in an elevator that has a downward acceleration of 1.4 m/s2.The force exerted by him on the floor is about:

Accepted Answer

A) 0 N 
B) 90 N 
C) 760 N 
D) 880 N 
E) 1010 N 
A) 0 N 
B) 90 N 
C) 760 N 
D) 880 N 
E) 1010 N

Question 7

You are driving your car along the road and hit a patch that is so icy that there is effectively no friction between your tires and the road.Which statement is most accurate?

Accepted Answer

A) If you hit the brakes, you will eventually stop. 
B) If you twist the steering wheel, you can turn into the skid. 
C) Nothing you do will have any effect; without any friction, you will continue to move in a straight line at a constant speed, as there is no net external force on you. 
D) If you hit the accelerator, you will get out of the icy patch faster. 
E) Your car will start to spin. 
A) If you hit the brakes, you will eventually stop. 
B) If you twist the steering wheel, you can turn into the skid. 
C) Nothing you do will have any effect; without any friction, you will continue to move in a straight line at a constant speed, as there is no net external force on you. 
D) If you hit the accelerator, you will get out of the icy patch faster. 
E) Your car will start to spin.

Question 8

In general, any surface exerts two forces on objects that are in contact with it.One force is parallel to the surface and the other is perpendicular to the surface.What are these forces called?

Accepted Answer

A) The parallel force is surface tension and the perpendicular force is friction. 
B) The parallel force is the normal force and the perpendicular force is friction. 
C) The parallel force is friction and the perpendicular force is surface tension. 
D) The parallel force is friction and the perpendicular force is the normal force. 
E) The parallel force is static friction and the perpendicular force is kinetic friction. 
A) The parallel force is surface tension and the perpendicular force is friction. 
B) The parallel force is the normal force and the perpendicular force is friction. 
C) The parallel force is friction and the perpendicular force is surface tension. 
D) The parallel force is friction and the perpendicular force is the normal force. 
E) The parallel force is static friction and the perpendicular force is kinetic friction.

Question 9

A car drives in a straight line on a level road with a constant acceleration of 3 m/s2.A ball is suspended by a string from the ceiling of the car; the ball does not swing, being at rest with respect to the car.What angle does the string make with the vertical?

Accepted Answer

A) 17 $\degree$ 
B) 35 $\degree$ 
C) 52 $\degree$ 
D) 73 $\degree$ 
E) Cannot be found without knowing the length of the string 
A) 17 $\degree$ 
B) 35 $\degree$ 
C) 52 $\degree$ 
D) 73 $\degree$ 
E) Cannot be found without knowing the length of the string

Question 10

A block slides down a frictionless plane that makes an angle of 30°with the horizontal.The acceleration of the block is:

Accepted Answer

A) 9.80 m/s2 
B) 5.66 m/s2 
C) 8.49 m/s2 
D) 0 m/s2 
E) 4.90 m/s2 
A) 9.80 m/s2 
B) 5.66 m/s2 
C) 8.49 m/s2 
D) 0 m/s2 
E) 4.90 m/s2

Question 11

A car travels east at constant velocity.The net force on the car is:

Accepted Answer

A) east 
B) west 
C) up 
D) down 
E) zero 
A) east 
B) west 
C) up 
D) down 
E) zero

Question 12

In SI units a force is numerically equal to the ______, when the force is applied to it.

Accepted Answer

A) velocity of the standard kilogram 
B) speed of the standard kilogram 
C) velocity of any object 
D) acceleration of the standard kilogram 
E) acceleration of any object 
A) velocity of the standard kilogram 
B) speed of the standard kilogram 
C) velocity of any object 
D) acceleration of the standard kilogram 
E) acceleration of any object

Question 13

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 14

A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s2 by means of a rope.The force of the block on the Earth is:

Accepted Answer

A) 14 N, up 
B) 14 N, down 
C) 35 N, up 
D) 35 N, down 
E) 49 N, up 
A) 14 N, up 
B) 14 N, down 
C) 35 N, up 
D) 35 N, down 
E) 49 N, up

Question 15

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 16

A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline.If the incline is 25°above the horizontal the magnitude of the normal force of the incline on the crate is:

Accepted Answer

A) 4.1 N 
B) 4.6 N 
C) 8.9 N 
D) 11 N 
E) 23 N 
A) 4.1 N 
B) 4.6 N 
C) 8.9 N 
D) 11 N 
E) 23 N

Question 17

A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline.If the incline is 25°above the horizontal the magnitude of the applied force is:

Accepted Answer

A) 4.1 N 
B) 4.6 N 
C) 8.9 N 
D) 11 N 
E) 23 N 
A) 4.1 N 
B) 4.6 N 
C) 8.9 N 
D) 11 N 
E) 23 N

Question 18

A 90-kg man stands in an elevator that is moving up at a constant speed of 5.0 m/s.The force exerted by him on the floor is about:

Accepted Answer

A) 0 N 
B) 90 N 
C) 880 N 
D) 450 N 
E) 49 N 
A) 0 N 
B) 90 N 
C) 880 N 
D) 450 N 
E) 49 N

Question 19

The standard 1-kg mass is attached to a compressed spring and the spring is released.If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a magnitude of:

Accepted Answer

A) 2.8 N 
B) 5.6 N 
C) 11.2 N 
D) 0 N 
E) an undetermined amount 
A) 2.8 N 
B) 5.6 N 
C) 11.2 N 
D) 0 N 
E) an undetermined amount

Question 20

A ball with a weight of 1.5 N is thrown at an angle of 30° 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° 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° below horizontal 
B) 0 N 
C) 9.8 N, up 
D) 9.8 N, down 
E) 1.5 N, down

Exam 5: Force and Motion

The unit of force called the newton is:

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:

A lead block is suspended from your hand by a string.The reaction to the force of gravity on the block is the force exerted by the:

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:

Equal forces act on isolated bodies A and B.The mass of B is three times that of A.The magnitude of the acceleration of A is:

A 90-kg man stands in an elevator that has a downward acceleration of 1.4 m/s2.The force exerted by him on the floor is about:

You are driving your car along the road and hit a patch that is so icy that there is effectively no friction between your tires and the road.Which statement is most accurate?

In general, any surface exerts two forces on objects that are in contact with it.One force is parallel to the surface and the other is perpendicular to the surface.What are these forces called?

A car drives in a straight line on a level road with a constant acceleration of 3 m/s2.A ball is suspended by a string from the ceiling of the car; the ball does not swing, being at rest with respect to the car.What angle does the string make with the vertical?

A block slides down a frictionless plane that makes an angle of 30°with the horizontal.The acceleration of the block is:

A car travels east at constant velocity.The net force on the car is:

In SI units a force is numerically equal to the ______, when the force is applied to it.

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 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s2 by means of a rope.The force of the block on the Earth is:

A newton is the force:

A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline.If the incline is 25°above the horizontal the magnitude of the normal force of the incline on the crate is:

A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline.If the incline is 25°above the horizontal the magnitude of the applied force is:

A 90-kg man stands in an elevator that is moving up at a constant speed of 5.0 m/s.The force exerted by him on the floor is about:

The standard 1-kg mass is attached to a compressed spring and the spring is released.If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a magnitude of:

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

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A 90-kg man stands in an elevator that has a downward acceleration of 1.4 m/s².The force exerted by him on the floor is about:

A car drives in a straight line on a level road with a constant acceleration of 3 m/s².A ball is suspended by a string from the ceiling of the car; the ball does not swing, being at rest with respect to the car.What angle does the string make with the vertical?

A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s² by means of a rope.The force of the block on the Earth is:

The standard 1-kg mass is attached to a compressed spring and the spring is released.If the mass initially has an acceleration of 5.6 m/s², the force of the spring has a magnitude of: