Question 1

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 2

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 3

A block is on a frictionless horizontal table,on earth.This block accelerates at   when a   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/   .A horizontal force of   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/   
B)  1.6 m/   
C)  2.0 m/   
D)  2.2 m/   
E)  2.3 m/   
A)  1.8 m/   
B)  1.6 m/   
C)  2.0 m/   
D)  2.2 m/   
E)  2.3 m/

Question 4

If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a   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 5

A ball is tossed vertically upward.When it reaches its highest point (before falling back downward)

Accepted Answer

A)  the velocity is zero, the acceleration is directed downward, and the force of gravity acting on the ball is directed downward. 
B)  the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is zero. 
C)  the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is directed downward. 
D)  the velocity and acceleration reverse direction, but the force of gravity on the ball remains downward. 
E)  the velocity, acceleration, and the force of gravity on the ball all reverse direction. 
A)  the velocity is zero, the acceleration is directed downward, and the force of gravity acting on the ball is directed downward. 
B)  the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is zero. 
C)  the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is directed downward. 
D)  the velocity and acceleration reverse direction, but the force of gravity on the ball remains downward. 
E)  the velocity, acceleration, and the force of gravity on the ball all reverse direction.

Question 6

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 7

A series of weights connected by very light cords are given an upward acceleration of   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 8

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 9

The figure shows a graph of the acceleration of an object as a function of the net force acting on it.The mass of this object,in grams,is closest to

Accepted Answer

A)  130. 
B)  11. 
C)  89. 
D)  8000. 
A)  130. 
B)  11. 
C)  89. 
D)  8000.

Question 10

A fish weighing 16 N is weighed using two spring scales,each of negligible weight,as shown in the figure.What will be the readings of the scales?

Accepted Answer

A)  The bottom scale will read 16 N, and the top scale will read zero. 
B)  Each scale will read 16 N. 
C)  The top scale will read 16 N, and the bottom scale will read zero. 
D)  The scales will have different readings, but the sum of the two readings will be 16 N. 
E)  Each scale will read 8 N. 
A)  The bottom scale will read 16 N, and the top scale will read zero. 
B)  Each scale will read 16 N. 
C)  The top scale will read 16 N, and the bottom scale will read zero. 
D)  The scales will have different readings, but the sum of the two readings will be 16 N. 
E)  Each scale will read 8 N.

Question 11

The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands.The mass of object 2 is   .What are the masses of objects 1 and 3?

Accepted Answer

A)  14 kg and 90 kg 
B)  72 kg and 18 kg 
C)  90 kg and 18 kg 
D)  14 kg and 72 kg 
A)  14 kg and 90 kg 
B)  72 kg and 18 kg 
C)  90 kg and 18 kg 
D)  14 kg and 72 kg

Question 12

Consider what happens when you jump up in the air.Which of the following is the most accurate statement?

Accepted Answer

A)  It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight. 
B)  You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth. 
C)  Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air. 
D)  When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. 
E)  When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because   . 
A)  It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight. 
B)  You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth. 
C)  Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air. 
D)  When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. 
E)  When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because   .

Question 13

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   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

The answer of A locomotive is pulling 19 freight cars,each...

Question 14

The International Space Station has a mass of 1.8 × 105 kg.A   astronaut inside the station pushes off one wall of the station so she accelerates at   .What is the magnitude of the acceleration of the space station as the astronaut is pushing off the wall? Give your answer relative to an observer who is space walking and therefore does not accelerate with the space station due to the push.

Accepted Answer

A)  5.8 × 10-4 m/s2 
B)  1.50 m/s2 
C)  4.7 × 10-4 m/s2 
D)  zero 
E)  3.9 × 10-3 m/s2 
A)  5.8 × 10-4 m/s2 
B)  1.50 m/s2 
C)  4.7 × 10-4 m/s2 
D)  zero 
E)  3.9 × 10-3 m/s2

Question 15

In order to lift a bucket of concrete,you must pull up harder on the bucket than it pulls down on you.

Accepted Answer

A) True 
 B)False

Question 16

15)Bumpers on cars are not of much use in a collision.To see why,calculate the average force a bumper would have to exert if it brought a 1200-kg car (a so-called compact model)to a rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph).(Bumpers are built with springs that compress to provide a stopping force without,hopefully,denting the metal.)

Accepted Answer

A)  1.8 × 104 N 
B)  1.6 × 104 N 
C)  5.4 × 104 N 
D)  6.5 × 105 N 
E)  3.2 × 104 N 
A)  1.8 × 104 N 
B)  1.6 × 104 N 
C)  5.4 × 104 N 
D)  6.5 × 105 N 
E)  3.2 × 104 N

Question 17

A block lies on a horizontal frictionless surface.A horizontal force of 100 N is applied to the block giving rise to an acceleration of   .
(a)Determine the mass of the block.
(b)Calculate the distance the block will travel if the force is applied for 10 s.
(c)Calculate the speed of the block after the force has been applied for 10 s.

Accepted Answer

(a)33 kg (

Question 18

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 19

In a ballistics test,a 1.50-g bullet is fired through a 28.0-kg block traveling horizontally toward the bullet.In this test,the bullet takes 11.4 ms to pass through the block as it reverses the block's velocity from 1.75 m/s to the right to 1.20 m/s to the left with constant acceleration.Find the magnitude of the force that the bullet exerts on the block during this ballistics test.

Accepted Answer

The answer of In a ballistics test,a 1.50-g bullet is...

Question 20

A construction worker pulls a box of tools on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal.The mass of the box and the tools is 40.0 kg.
(a)Draw a free-body diagram for the box.
(b)Calculate the acceleration of the box.
(c)How hard does the floor push up on the box?

Accepted Answer

(a)The box is acted on by the force of g

Exam 4: Newtons Laws of Motion

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?

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

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

A ball is tossed vertically upward.When it reaches its highest point (before falling back downward)

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

A series of weights connected by very light cords are given an upward acceleration of 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

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?

The figure shows a graph of the acceleration of an object as a function of the net force acting on it.The mass of this object,in grams,is closest to

A fish weighing 16 N is weighed using two spring scales,each of negligible weight,as shown in the figure.What will be the readings of the scales?

The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands.The mass of object 2 is .What are the masses of objects 1 and 3?

Consider what happens when you jump up in the air.Which of the following is the most accurate statement?

In order to lift a bucket of concrete,you must pull up harder on the bucket than it pulls down on you.

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

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

Dynamics of Rotational Motion

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

Nuclear Physics

Particle Physics and Cosmology

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