Question 1

A 20-ton truck collides with a 1500-lb car.Which of the following statements must be true?

Accepted Answer

A) During the collision,the force on the truck is greater then the force on the car. 
B) During the collision,the force on the truck is equal to the force on the car. 
C) During the collision,the force on the truck is smaller than the force on the car. 
D) The truck did not slow down during the collision,but the car did. 
E) The car did not slow down during the collision,but the truck did. 
A) During the collision,the force on the truck is greater then the force on the car. 
B) During the collision,the force on the truck is equal to the force on the car. 
C) During the collision,the force on the truck is smaller than the force on the car. 
D) The truck did not slow down during the collision,but the car did. 
E) The car did not slow down during the collision,but the truck did.

Question 2

The acceleration due to gravity is lower on the Moon than on Earth.Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface,compared to Earth?

Accepted Answer

A) Mass is less,weight is the same. 
B) Mass is the same,weight is less. 
C) Both mass and weight are less. 
D) Both mass and weight are the same. 
A) Mass is less,weight is the same. 
B) Mass is the same,weight is less. 
C) Both mass and weight are less. 
D) Both mass and weight are the same.

Question 3

A 1200-kg car is pulling a 500-kg trailer along level ground.Friction of the road on the trailer is negligible.The car accelerates with an acceleration of 1.3 m/s2.What is the force exerted by the car on the trailer?

Accepted Answer

A) 550 N 
B) 600 N 
C) 650 N 
D) 700 N 
E) 750 N 
A) 550 N 
B) 600 N 
C) 650 N 
D) 700 N 
E) 750 N

Question 4

In order to get an object moving,you must push harder on it than it pushes back on you.

Accepted Answer

A) True 
 B)False

Question 5

You are standing in a moving bus,facing forward,when you suddenly slide forward as the bus comes to an immediate stop.What force caused you to slide forward?

Accepted Answer

A) gravity 
B) the normal force due to your contact with the floor of the bus 
C) the force due to friction between you and the floor of the bus 
D) There is not a force causing you to slide forward. 
A) gravity 
B) the normal force due to your contact with the floor of the bus 
C) the force due to friction between you and the floor of the bus 
D) There is not a force causing you to slide forward.

Question 6

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces acting on this crate must point

Accepted Answer

A) down the ramp. 
B) up the ramp. 
C) perpendicular to the ramp. 
D) vertically downward. 
E) None of the above choices is correct. 
A) down the ramp. 
B) up the ramp. 
C) perpendicular to the ramp. 
D) vertically downward. 
E) None of the above choices is correct.

Question 7

A 75-N box rests on a perfectly smooth horizontal surface.The minimum force need to start the box moving is

Accepted Answer

A) 75 N. 
B) 7.5 N. 
C) 750 N. 
D) any horizontal force greater than zero. 
A) 75 N. 
B) 7.5 N. 
C) 750 N. 
D) any horizontal force greater than zero.

Question 8

A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s.What is the magnitude of the force exerted by the rope on the bucket?

Accepted Answer

A) 0.00 N 
B) 2.0 N 
C) 5.0 N 
D) 10 N 
E) 49 N 
A) 0.00 N 
B) 2.0 N 
C) 5.0 N 
D) 10 N 
E) 49 N

Question 9

If the rockets of a spaceship in outer space (far from all gravity)suddenly lose power and go off,the spaceship will gradually slow to a stop.

Accepted Answer

A) True 
 B)False

Question 10

A truck is using a hook to tow a car whose mass is one quarter that of the truck.If the force exerted by the truck on the car is 6000 N,then the force exerted by the car on the truck is

Accepted Answer

A) 1500 N. 
B) 24000 N. 
C) 6000 N. 
D) 12000 N. 
E) We need to know if the car is accelerating to answer this question. 
A) 1500 N. 
B) 24000 N. 
C) 6000 N. 
D) 12000 N. 
E) We need to know if the car is accelerating to answer this question.

Question 11

A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate.If this person is standing on a bathroom scale inside the elevator,what would the scale read?

Accepted Answer

A) more than 700 N 
B) less than 700 N 
C) 700 N 
D) It could be more or less than 700 N,depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2. 
A) more than 700 N 
B) less than 700 N 
C) 700 N 
D) It could be more or less than 700 N,depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2.

Question 12

A bucket is being lowered by a very light rope with a constant downward velocity.The tension in the rope must be

Accepted Answer

A) equal to the weight of the bucket. 
B) greater than the weight of the bucket. 
C) less than the weight of the bucket. 
A) equal to the weight of the bucket. 
B) greater than the weight of the bucket. 
C) less than the weight of the bucket.

Question 13

An astronaut weighs 99 N on the Moon,where the acceleration of gravity is 1.62 m/s2.How much does she weigh on Earth?

Accepted Answer

A) 16 N 
B) 61 N 
C) 99 N 
D) 600 N 
E) 440 N 
A) 16 N 
B) 61 N 
C) 99 N 
D) 600 N 
E) 440 N

Question 14

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train.From this observation,you can conclude that this train is

Accepted Answer

A) speeding up. 
B) slowing down. 
C) changing direction. 
D) speeding up and changing direction. 
E) slowing down and changing direction. 
A) speeding up. 
B) slowing down. 
C) changing direction. 
D) speeding up and changing direction. 
E) slowing down and changing direction.

Exam 5: Newtons Laws of Motion

A 20-ton truck collides with a 1500-lb car.Which of the following statements must be true?

The acceleration due to gravity is lower on the Moon than on Earth.Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface,compared to Earth?

A 1200-kg car is pulling a 500-kg trailer along level ground.Friction of the road on the trailer is negligible.The car accelerates with an acceleration of 1.3 m/s2.What is the force exerted by the car on the trailer?

In order to get an object moving,you must push harder on it than it pushes back on you.

You are standing in a moving bus,facing forward,when you suddenly slide forward as the bus comes to an immediate stop.What force caused you to slide forward?

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces acting on this crate must point

A 75-N box rests on a perfectly smooth horizontal surface.The minimum force need to start the box moving is

A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s.What is the magnitude of the force exerted by the rope on the bucket?

If the rockets of a spaceship in outer space (far from all gravity)suddenly lose power and go off,the spaceship will gradually slow to a stop.

A truck is using a hook to tow a car whose mass is one quarter that of the truck.If the force exerted by the truck on the car is 6000 N,then the force exerted by the car on the truck is

A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate.If this person is standing on a bathroom scale inside the elevator,what would the scale read?

A bucket is being lowered by a very light rope with a constant downward velocity.The tension in the rope must be

An astronaut weighs 99 N on the Moon,where the acceleration of gravity is 1.62 m/s2.How much does she weigh on Earth?

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train.From this observation,you can conclude that this train is

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

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A 1200-kg car is pulling a 500-kg trailer along level ground.Friction of the road on the trailer is negligible.The car accelerates with an acceleration of 1.3 m/s².What is the force exerted by the car on the trailer?

An astronaut weighs 99 N on the Moon,where the acceleration of gravity is 1.62 m/s².How much does she weigh on Earth?