Question 1

An airplane is flying in horizontal flight at a constant velocity.The weight of the airplane is 40,000 N.The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wing.The engine produces a forward thrust force of 2,000 N.Which of the following statements is true?
A) the net force on the airplane is zero
B) the net force on the airplane is forward
C) the net force on the airplane is upward
D) the net force on the airplane is downward
E) the net force on the airplane is backward

Accepted Answer

Since the airplane is in horizontal flight at a constant velocity, the net force on the airplane is zero. This means that the lift force produced by the wings (which is perpendicular to the wings) is equal and opposite to the weight of the airplane, and the drag force (which is parallel to the wings) is equal and opposite to the thrust force produced by the engine. Therefore, the net force on the airplane is zero.

Question 2

In the figure an airport luggage carrying train with a tractor T is pulling three luggage carts,M₁,M₂,and M₃,with constant velocity of 4.5 m/s.If T = 300.0 kg,M₁ = 200.0 kg,M₂ = 100.0 kg,and M₃ = 100.0 kg,and the coefficient of kinetic friction for each is 0.4000,what is the force in the connection between the tractor T and cart M₁? A) 2941 N B) 2744 N C) 1568 N D) 1862 N E) 2439 N

Accepted Answer

C

Question 3

If an object of mass 20 kg on earth is sent to the moon it will have a mass of
A) 10 kg.
B) 20 kg.
C) 0.0 kg.
D) 4.0 kg.

Accepted Answer

Mass is a fundamental property of matter and remains constant regardless of the location or gravitational field. Therefore, the object of mass 20 kg on earth will still have a mass of 20 kg on the moon.

Question 4

A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests.The chair weighs 100 N.Each armrest exerts an upward force of 25.0 N on his arms,and the seat exerts an upward force of 500 N.What force does the floor exert on his feet?
A) 75 N upward
B) 500 N upward
C) 525 N upward
D) 50 N upward
E) 0 N

Accepted Answer

The answer of A man who weighs 600 N is...

Question 5

A car is driving on a level highway.It is acted upon by the following forces: a downward gravitational force of 12 kN,an upward contact force due to the road of 12 kN,another contact force due to the road of 7 kN directed West,and a drag force due to air resistance of 5 kN directed East.What is the net force acting on the car?
A) 7 kN East
B) 24 kN up
C) 2 kN West
D) 5 kN East
E) 2 kN East

Accepted Answer

To find the net force, we need to add up all the forces acting on the car.

Downward gravitational force = -12 kN (negative because it is acting downwards)
Upward contact force = +12 kN
Contact force due to the road directed West = -7 kN (negative because it is directed opposite to the positive direction)
Drag force due to air resistance directed East = +5 kN

Net force = (-12 kN) + (12 kN) + (-7 kN) + (5 kN) = -2 kN West

So, the net force acting on the car is 2 kN West, which is option C.

Question 6

A freight train consists of an engine and several identical cars on a level track.Which of the following statements is true?
A) if the train is moving at constant speed,the engine must be pulling with a force greater than the train's weight
B) if the train is moving at constant speed,the engine's pull on the first car must exceed that car's backward pull on the engine
C) if the train is coasting,its inertia makes it slow down and eventually stop
D) if the train is moving at constant speed the engine's pull must be equal to the friction

Accepted Answer

If the train is moving at constant speed, the net force must be zero, meaning the engine's pull must be equal to the frictional forces opposing the motion.

Question 7

The force that causes an object to fall to earth is
A) gravitational force.
B) electromagnetic force.
C) weak interaction.
D) strong nuclear force.

Accepted Answer

The gravitational force is the force that attracts any two masses towards each other. It is responsible for the phenomenon of weight and the cause of objects falling to the Earth. The other options - electromagnetic force, weak interaction, and strong nuclear force - do not directly cause objects to fall to the Earth.

Question 8

An airplane is flying in horizontal flight at a constant velocity.The weight of the airplane is 40,000 N.The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wing.The engine produces a forward thrust force of 2,000 N.Which of the following statements is true?
A) the lift force on the airplane is zero
B) the drag force on the airplane is zero
C) the lift force on the airplane is 42,000 N upward
D) the drag force on the airplane is 38,000 N downward
E) the drag force on the airplane is 2,000 N backward

Accepted Answer

The drag force must equal the thrust force for the airplane to maintain constant velocity, so the drag force is 2,000 N backward.

Question 9

When a person stands on a scale,which of the following is not a force exerted on the scale?
A) a contact force due to the floor
B) a contact force due to the person's feet
C) the weight of the person
D) the weight of the scale

Accepted Answer

The answer of When a person stands on a scale,which...

Question 10

The force that holds charged atoms together is
A) gravitational force.
B) electromagnetic force.
C) weak interaction.
D) strong nuclear forces.

Accepted Answer

The force that holds charged atoms together is the electromagnetic force. This force is responsible for the attraction between positively charged nuclei and negatively charged electrons in an atom. The other forces listed - gravitational force, weak interaction, and strong nuclear forces - are not relevant to the bonding of atoms.

Question 11

The force that holds the nucleus together is
A) gravitational force.
B) electromagnetic force.
C) weak interaction.
D) strong nuclear force.

Accepted Answer

The force that holds the nucleus together is the strong nuclear force. This force overcomes the electromagnetic force, which would otherwise cause the positively charged protons within the nucleus to repel each other. Gravitational force is too weak to play a significant role in holding the nucleus together, and weak interaction only affects the decay of particles within the nucleus, rather than holding the nucleus together.

Question 12

An airplane is traveling in level flight at a constant velocity.L is the lift,W is the weight,T is the thrust,and D is the drag.Which of the diagrams is the correct free body force diagram for the airplane? 
A) Figure 1
B) Figure 2
C) Figure 3
D) Figure 4
E) Figure 5

Accepted Answer

The answer of An airplane is traveling in level flight...

Question 13

A 20-kg sack of potatoes at the corner store weighs
A) 190 pounds.
B) 150 pounds.
C) 44 pounds.
D) 9.9 pounds.

Accepted Answer

To convert the weight of a 20-kg sack of potatoes to pounds, we multiply by the conversion factor of 2.205 pounds per kilogram:

20 kg x 2.205 lbs/kg = 44.1 lbs

So, the closest answer choice is C, which is 44 pounds.

Question 14

Which of the following is a vector quantity?
A) volume
B) force
C) speed
D) time
E) length

Accepted Answer

A vector quantity is a physical quantity that has both magnitude and direction. Force is a vector quantity because it has both magnitude (measured in Newtons) and direction (measured in terms of the direction of push or pull). Volume, speed, time, and length are all scalar quantities as they only have magnitude and no direction associated with them.

Question 15

A rock of weight 17.5 N is immersed in a beaker of water while suspended from a spring scale with a reading of 9.00 N.The weight of the beaker and water together is 23.5 N.What is the net force of the beaker on the table?
A) 17.5 N
B) 23.5 N
C) 32.0 N
D) 41.0 N

Accepted Answer

The net force of the beaker on the table is equal to the weight of the beaker and water minus the weight of the rock. So, the net force is 23.5 N - 17.5 N = 6.0 N.

Question 16

Three objects experience interactions.Object A has mass,object B has electrical charge,and object C has both mass and electrical charge.Object A and object B have a rope connected between them.Which of the following statements are true?
A) the electrical force on A due to B has the same magnitude as the gravitational force on B due to A
B) the gravitational force on C due to A has the same magnitude as the gravitational force on A due to C
C) the rope force on A due to B has the same magnitude as the electrical force on B due to A
D) the rope force on B due to A has the same magnitude as the gravitational force on A due to C

Accepted Answer

According to Newton's third law, the gravitational force between two objects is always equal in magnitude and opposite in direction. Therefore, the gravitational force on C due to A has the same magnitude as the gravitational force on A due to C. The other statements are not necessarily true as the magnitudes of electrical forces and rope forces depend on the specific properties of the interacting objects.

Question 17

A person weighs 146 pounds.The person's weight is (1 lb = 4.45 N)
A) 445 N.
B) 500 N.
C) 584 N.
D) 650 N.

Accepted Answer

The answer of A person weighs 146 pounds.The person's weight...

Question 18

Three objects experience interactions.Object A has mass,object B has electrical charge,and object C has both mass and electrical charge.Which of the following statements are true?
A) object A and object B experience an electrical interaction
B) object A and object C experience a gravitational interaction
C) object C experiences an electrical interaction with itself
D) object A and object C experience an electrical interaction
E) object A and object B experience a gravitational interaction

Accepted Answer

The answer of Three objects experience interactions.Object A has mass,object...

Question 19

The net force on a moving object suddenly becomes zero.The object then
A) stops abruptly.
B) stops during a short time interval.
C) changes direction.
D) continues at constant velocity.
E) slows down gradually.

Accepted Answer

According to Newton's first law of motion, an object will continue to move at a constant velocity in a straight line unless acted upon by an unbalanced force. When the net force on a moving object becomes zero, there is no unbalanced force acting on the object, therefore it will continue to move at a constant velocity. It will not stop abruptly, stop during a short time interval, change direction, or slow down gradually.

Question 20

A person weighs 155 pounds.What is the person's weight in Newtons?
A) 155 N
B) 689 N
C) 39.3 N
D) 392 N

Accepted Answer

To convert pounds to Newtons, we use the conversion factor: 1lb = 4.448N

So, 155 pounds = 155 x 4.448 N = 689.24 N

Therefore, the person's weight in Newtons is approximately 689 N, which makes choice B the correct answer.

Quiz 2: Force

If an object of mass 20 kg on earth is sent to the moon it will have a mass of

A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests.The chair weighs 100 N.Each armrest exerts an upward force of 25.0 N on his arms,and the seat exerts an upward force of 500 N.What force does the floor exert on his feet?

A freight train consists of an engine and several identical cars on a level track.Which of the following statements is true?

The force that causes an object to fall to earth is

When a person stands on a scale,which of the following is not a force exerted on the scale?

The force that holds charged atoms together is

The force that holds the nucleus together is

An airplane is traveling in level flight at a constant velocity.L is the lift,W is the weight,T is the thrust,and D is the drag.Which of the diagrams is the correct free body force diagram for the airplane?

A 20-kg sack of potatoes at the corner store weighs

Which of the following is a vector quantity?

A rock of weight 17.5 N is immersed in a beaker of water while suspended from a spring scale with a reading of 9.00 N.The weight of the beaker and water together is 23.5 N.What is the net force of the beaker on the table?

Three objects experience interactions.Object A has mass,object B has electrical charge,and object C has both mass and electrical charge.Object A and object B have a rope connected between them.Which of the following statements are true?

A person weighs 146 pounds.The person's weight is (1 lb = 4.45 N)

Three objects experience interactions.Object A has mass,object B has electrical charge,and object C has both mass and electrical charge.Which of the following statements are true?

The net force on a moving object suddenly becomes zero.The object then

A person weighs 155 pounds.What is the person's weight in Newtons?