Question 1

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 2

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 3

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$\degree$ 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 4

A box is on a scale.In which of these situations will the scale reading NOT equal the weight of the box?

Accepted Answer

A) The scale and box are in an airplane flying at constant speed. 
B) The scale and box are in an elevator rising at constant speed. 
C) The scale and box are in a hot air balloon in level flight. 
D) The scale and box are on a steep slope, held in place by friction. 
E) The scale and box are on Mars. 
A) The scale and box are in an airplane flying at constant speed. 
B) The scale and box are in an elevator rising at constant speed. 
C) The scale and box are in a hot air balloon in level flight. 
D) The scale and box are on a steep slope, held in place by friction. 
E) The scale and box are on Mars.

Question 5

A circus performer of weight W is walking along a "high wire" as shown.The tension in the wire is:

Accepted Answer

A) approximately W 
B) approximately W/2 
C) much less than W 
D) much more than W 
E) depends on whether he stands on one or two feet 
A) approximately W 
B) approximately W/2 
C) much less than W 
D) much more than W 
E) depends on whether he stands on one or two feet

Question 6

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 7

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley.The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

Accepted Answer

A) 1 
B) 1/12 
C) 1/13 
D) 1/25 
E) 13/25 
A) 1 
B) 1/12 
C) 1/13 
D) 1/25 
E) 13/25

Question 8

The term "mass" refers to the same physical concept as:

Accepted Answer

A) weight 
B) inertia 
C) force 
D) acceleration 
E) volume 
A) weight 
B) inertia 
C) force 
D) acceleration 
E) volume

Question 9

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 10

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s2.When the same force is applied to another object its acceleration is one-fifth as much.The mass of the object is:

Accepted Answer

A) 0.2 kg 
B) 0.5 kg 
C) 1.0 kg 
D) 5.0 kg 
E) 10 kg 
A) 0.2 kg 
B) 0.5 kg 
C) 1.0 kg 
D) 5.0 kg 
E) 10 kg

Question 11

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 12

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$\degree$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 13

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 14

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 15

A 1100-kg elevator is rising and its speed is increasing at 3.0 m/s2.The tension in the elevator cable is:

Accepted Answer

A) 7500 N 
B) 1100 N 
C) 3300 N 
D) 11000 N 
E) 14000 N 
A) 7500 N 
B) 1100 N 
C) 3300 N 
D) 11000 N 
E) 14000 N

Question 16

The mass and weight of a body:

Accepted Answer

A) differ by a factor of 9.8 
B) are identical 
C) are the same physical quantities expressed in different units 
D) are both a direct measure of the inertia of the body 
E) have the same ratio as that of any other body placed at that location 
A) differ by a factor of 9.8 
B) are identical 
C) are the same physical quantities expressed in different units 
D) are both a direct measure of the inertia of the body 
E) have the same ratio as that of any other body placed at that location

Question 17

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 18

A book rests on a table, exerting a downward force on the table.The reaction to this force is:

Accepted Answer

A) the force of the Earth on the book 
B) the force of the table on the book 
C) the force of the Earth on the table 
D) the force of the book on the Earth 
E) the inertia of the book 
A) the force of the Earth on the book 
B) the force of the table on the book 
C) the force of the Earth on the table 
D) the force of the book on the Earth 
E) the inertia of the book

Question 19

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 20

A force of 1 N is:

Accepted Answer

A) 1 kg/s 
B) 1kg .m/s 
C) 1kg. m/s2 
D) 1kg . m2/s 
E) 1kg . m2/s2 
A) 1 kg/s 
B) 1kg .m/s 
C) 1kg. m/s2 
D) 1kg . m2/s 
E) 1kg . m2/s2

Exam 5: Force and Motion I

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:

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 °\degree° above the horizontal the magnitude of the applied force is:

A box is on a scale.In which of these situations will the scale reading NOT equal the weight of the box?

A circus performer of weight W is walking along a "high wire" as shown.The tension in the wire is:

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?

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley.The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

The term "mass" refers to the same physical concept as:

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:

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s2.When the same force is applied to another object its acceleration is one-fifth as much.The mass of the object 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:

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 °\degree° above the horizontal the magnitude of the normal force of the incline on 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:

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

A 1100-kg elevator is rising and its speed is increasing at 3.0 m/s2.The tension in the elevator cable is:

The mass and weight of a body:

Which of the following quantities is NOT a vector?

A book rests on a table, exerting a downward force on the table.The reaction to this force is:

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

A force of 1 N is:

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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 $\degree$ above the horizontal the magnitude of the applied force is:

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s².When the same force is applied to another object its acceleration is one-fifth as much.The mass of the object 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:

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 $\degree$ above the horizontal the magnitude of the normal force of the incline on 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:

A 1100-kg elevator is rising and its speed is increasing at 3.0 m/s².The tension in the elevator cable is: