Question 1

A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is

Accepted Answer

A)  zero. 
B)  up the hill and equal to the weight of the car. 
C)  down the hill and equal to the weight of the car. 
D)  up the hill and greater than the weight of the car. 
E)  down the hill and greater than the weight of the car. 
A)  zero. 
B)  up the hill and equal to the weight of the car. 
C)  down the hill and equal to the weight of the car. 
D)  up the hill and greater than the weight of the car. 
E)  down the hill and greater than the weight of the car.

Question 2

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B?

Accepted Answer

A: 16 M/S²

Question 3

A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in the figure. A, B, and C are the tensions in the connecting cords. The SMALLEST of the three tensions, A, B, and C, is closest to

Accepted Answer

A)  80.0 N. 
B)  196 N. 
C)  276 N. 
D)  483 N. 
E)  621 N. 
A)  80.0 N. 
B)  196 N. 
C)  276 N. 
D)  483 N. 
E)  621 N.

Question 4

A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision

Accepted Answer

A)  the force on the truck due to the collision is slightly greater than the force on the car. 
B)  the force of on the truck due to the collision is exactly equal to the force on the car. 
C)  the force on the car due to the collision is much greater than the force on the truck. 
D)  the car and the truck have the same magnitude acceleration. 
A)  the force on the truck due to the collision is slightly greater than the force on the car. 
B)  the force of on the truck due to the collision is exactly equal to the force on the car. 
C)  the force on the car due to the collision is much greater than the force on the truck. 
D)  the car and the truck have the same magnitude acceleration.

Question 5

A block is on a frictionless horizontal table, on earth. This block accelerates at 3.6 m/s2 when a 90 N horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/ s2. A horizontal force of 45 N is applied to the block when it is on the moon. What acceleration does this force impart to the block?

Accepted Answer

A)  1.8 m/s2 
B)  1.6 m/s2 
C)  2.0 m/s2 
D)  2.2 m/s2 
E)  2.3 m/s2 
A)  1.8 m/s2 
B)  1.6 m/s2 
C)  2.0 m/s2 
D)  2.2 m/s2 
E)  2.3 m/s2

Question 6

A locomotive is pulling 19 freight cars, each of which is loaded with the same amount of weight. The mass of each freight car (with its load) is 37,000 kg. If the train is accelerating at 0.22 m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car, and friction is negligible.)

Accepted Answer

Question 7

A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/s2 when a 90 N horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2. What is the weight of the block on the moon?

Accepted Answer

A)  77 N 
B)  67 N 
C)  58 N 
D)  48 N 
E)  39 N 
A)  77 N 
B)  67 N 
C)  58 N 
D)  48 N 
E)  39 N

Question 8

A 50.0-N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.75 m/s and that it stops in 2.25 s with uniform acceleration. What magnitude force does friction exert on this box?

Accepted Answer

A)  3.97 N 
B)  8.93 N 
C)  38.9 N 
D)  50.0 N 
E)  490 N 
A)  3.97 N 
B)  8.93 N 
C)  38.9 N 
D)  50.0 N 
E)  490 N

Question 9

A 1000-kg car is driving toward the north along a straight horizontal road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest uniformly in a distance of 200 m. What are the magnitude and direction of the net force applied to the car to bring it to rest?

Accepted Answer

A)  1.00 N north 
B)  10.0 × 103 N south 
C)  1.00 × 103 N south 
D)  1.00 N south 
E)  100 N south 
A)  1.00 N north 
B)  10.0 × 103 N south 
C)  1.00 × 103 N south 
D)  1.00 N south 
E)  100 N south

Question 10

A box of mass m is pulled with a constant acceleration a along a horizontal frictionless floor by a wire that makes an angle of 15° above the horizontal. If T is the tension in this wire, then

Accepted Answer

A) T = ma. B) T > ma. C) T < ma. A) T = ma. B) T > ma. C) T < ma.

Question 11

An object is moving forward with a constant velocity. Which statement about this object MUST be true?

Accepted Answer

A)  The net force on the object is zero. 
B)  The net force on the object is in the forward direction. 
C)  No forces are acting on the object. 
D)  The acceleration of the object is in the forward direction. 
A)  The net force on the object is zero. 
B)  The net force on the object is in the forward direction. 
C)  No forces are acting on the object. 
D)  The acceleration of the object is in the forward direction.

Question 12

You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that

Accepted Answer

A)  the velocity of the bus is forward. 
B)  the velocity of the bus is backward. 
C)  You cannot conclude anything about the direction of the velocity of the bus. 
A)  the velocity of the bus is forward. 
B)  the velocity of the bus is backward. 
C)  You cannot conclude anything about the direction of the velocity of the bus.

Question 13

You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is

Accepted Answer

A)  exactly 1500 N only if the box does not move. 
B)  exactly 1500 N whether or not the box moves. 
C)  greater than 1500 N if the box moves. 
D)  less than 1500 N if the box moves. 
E)  greater than 1500 N if the bat bounces back. 
A)  exactly 1500 N only if the box does not move. 
B)  exactly 1500 N whether or not the box moves. 
C)  greater than 1500 N if the box moves. 
D)  less than 1500 N if the box moves. 
E)  greater than 1500 N if the bat bounces back.

Question 14

An 1100-kg car traveling at 27.0 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?

Accepted Answer

A)  690 N 
B)  550 N 
C)  410 N 
D)  340 N 
A)  690 N 
B)  550 N 
C)  410 N 
D)  340 N

Question 15

Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?

Accepted Answer

A)  1.1 m/s2 
B)  1.3 m/s2 
C)  1.5 m/s2 
D)  1.7 m/s2 
A)  1.1 m/s2 
B)  1.3 m/s2 
C)  1.5 m/s2 
D)  1.7 m/s2

Question 16

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 17

A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in the figure. A, B, and C are the tensions in the connecting cords. The pull P is closest to

Accepted Answer

A)  690 N. 
B)  490 N. 
C)  290 N. 
D)  200 N. 
E)  50 N. 
A)  690 N. 
B)  490 N. 
C)  290 N. 
D)  200 N. 
E)  50 N.

Question 18

If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a 5.0 N force, then its acceleration must be

Accepted Answer

A)  3.0 m/s2. 
B)  2.2 m/s2. 
C)  1.0 m/s2. 
D)  We cannot tell from the information given. 
A)  3.0 m/s2. 
B)  2.2 m/s2. 
C)  1.0 m/s2. 
D)  We cannot tell from the information given.

Question 19

On its own, a certain tow-truck has a maximum acceleration of 3.0 m/s2. What would be the maximum acceleration when this truck was towing a bus of twice its own mass?

Accepted Answer

A)  2.5 m/s2 
B)  2.0 m/s2 
C)  1.5 m/s2 
D)  1.0 m/s2 
A)  2.5 m/s2 
B)  2.0 m/s2 
C)  1.5 m/s2 
D)  1.0 m/s2

Question 20

A dog is standing in the bed of a pickup truck. The bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog

Accepted Answer

A)  does not move left or right, but the back of the truck moves towards the dog. 
B)  moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck. 
C)  moves to the right at the same rate as the truck, so it doesn't slide. 
D)  moves to the left, as the truck moves to the right, causing the dog to slide towards the back of the truck. 
A)  does not move left or right, but the back of the truck moves towards the dog. 
B)  moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck. 
C)  moves to the right at the same rate as the truck, so it doesn't slide. 
D)  moves to the left, as the truck moves to the right, causing the dog to slide towards the back of the truck.

Exam 4: Newtons Laws of Motion

A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B?

A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in the figure. A, B, and C are the tensions in the connecting cords. The SMALLEST of the three tensions, A, B, and C, is closest to

A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision

A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/s2 when a 90 N horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2. What is the weight of the block on the moon?

A 50.0-N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.75 m/s and that it stops in 2.25 s with uniform acceleration. What magnitude force does friction exert on this box?

A 1000-kg car is driving toward the north along a straight horizontal road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest uniformly in a distance of 200 m. What are the magnitude and direction of the net force applied to the car to bring it to rest?

A box of mass m is pulled with a constant acceleration a along a horizontal frictionless floor by a wire that makes an angle of 15° above the horizontal. If T is the tension in this wire, then

An object is moving forward with a constant velocity. Which statement about this object MUST be true?

You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that

You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is

An 1100-kg car traveling at 27.0 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?

Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?

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

A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in the figure. A, B, and C are the tensions in the connecting cords. The pull P is closest to

If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a 5.0 N force, then its acceleration must be

On its own, a certain tow-truck has a maximum acceleration of 3.0 m/s2. What would be the maximum acceleration when this truck was towing a bus of twice its own mass?

Units, Physical Quantities, and Vectors

Motion Along a Straight Line

Motion in Two or Three Dimensions

Applying Newtons Laws

Work and Kinetic Energy

Potential Energy and Energy Conservation

Momentum, Impulse, and Collisions

Rotation of Rigid Bodies

Equilibrium and Elasticity

Fluid Mechanics

Gravitation

Periodic Motion

Mechanical Waves

Sound and Hearing

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

The Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current, Resistance, and Electromotive Force

Direct-Current Circuits

Magnetic Field and Magnetic Forces

Sources of Magnetic Field

Electromagnetic Induction

Inductance

Alternating Current

Electromagnetic Waves

The Nature and Propagation of Light

Geometric Optics

Interference

Diffraction

Relativity

Photons: Light Waves Behaving As Particles

Particles Behaving As Waves

Quantum Mechanics

Atomic Structure

Molecules and Condensed Matter

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Filters

A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s² by a pull P, as shown in the figure. A, B, and C are the tensions in the connecting cords. The SMALLEST of the three tensions, A, B, and C, is closest to

A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/s² when a 90 N horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2. What is the weight of the block on the moon?

A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s² by a pull P, as shown in the figure. A, B, and C are the tensions in the connecting cords. The pull P is closest to

On its own, a certain tow-truck has a maximum acceleration of 3.0 m/s². What would be the maximum acceleration when this truck was towing a bus of twice its own mass?