Question 1

An object is moving with constant non-zero velocity.Which of the following statements about it must be true?

Accepted Answer

A) A constant force is being applied to it in the direction of motion. 
B) A constant force is being applied to it in the direction opposite of motion. 
C) A constant force is being applied to it perpendicular to the direction of motion. 
D) The net force on the object is zero. 
E) Its acceleration is in the same direction as it velocity. 
A) A constant force is being applied to it in the direction of motion. 
B) A constant force is being applied to it in the direction opposite of motion. 
C) A constant force is being applied to it perpendicular to the direction of motion. 
D) The net force on the object is zero. 
E) Its acceleration is in the same direction as it velocity. D

Question 2

A horse pulls a cart with force  
.As a result of this force the cart accelerates with constant acceleration.The magnitude of the force that the cart exerts on the horse

Accepted Answer

A) is zero newtons. 
B) equal to the magnitude of   . 
C) less than the magnitude of   . 
D) greater than the magnitude of   . 
E) cannot be determined without knowing the mass of the horse. 
A) is zero newtons. 
B) equal to the magnitude of   . 
C) less than the magnitude of   . 
D) greater than the magnitude of   . 
E) cannot be determined without knowing the mass of the horse. B

Question 3

A girl attaches a rock to a string,which she then swings counter-clockwise in a horizontal circle.The string breaks at point P in the figure,which shows a bird's-eye view (as seen from above).Which path (A-E)will the rock follow?

Accepted Answer

A) Path A 
B) Path B 
C) Path C 
D) Path D 
E) Path E 
A) Path A 
B) Path B 
C) Path C 
D) Path D 
E) Path E B

Question 4

In a collision between a huge SUV and a small hybrid car,the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.

Accepted Answer

A) True 
 B)False

Question 5

A block is on a frictionless table,on earth.The block accelerates at 5.3 m/   When a   Horizontal force is applied to it.The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/   .A horizontal force of 5 N is now applied to the block when it is on the Moon.The acceleration imparted to the block by this force is closest to

Accepted Answer

A) 2.7 m/   . 
B) 2.4 m/   . 
C) 2.9 m/   . 
D) 3.2 m/   . 
E) 3.4 m/   . 
A) 2.7 m/   . 
B) 2.4 m/   . 
C) 2.9 m/   . 
D) 3.2 m/   . 
E) 3.4 m/   .

Question 6

An object of weight W is in freefall close to the surface of Earth.The magnitude of the force that the object exerts on Earth is

Accepted Answer

A) greater than W. 
B) less than W. 
C) equal to W. 
D) zero. 
E) cannot be determined without knowing the relative masses of the object and the earth. 
A) greater than W. 
B) less than W. 
C) equal to W. 
D) zero. 
E) cannot be determined without knowing the relative masses of the object and the earth.

Question 7

A car of mass 1100 kg that is traveling at 27 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 8

An elevator suspended by a vertical cable is moving downward but slowing down.The tension in the cable must be

Accepted Answer

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

Question 9

You pull on a crate with a rope.If the crate moves,the rope's pull on the crate must have been larger than the crate's pull on the rope,but if the crate does not move,both of these pulls must have been equal.

Accepted Answer

A) True 
 B)False

Question 10

You push on box G that is next to box H,causing both boxes to slide along the floor,as shown in the figure.The reaction force to your push is

Accepted Answer

A) the push of box G on box H. 
B) the push of box H on box G. 
C) the push of box G against you. 
D) the upward force of the floor n box G. 
E) the acceleration of box G. 
A) the push of box G on box H. 
B) the push of box H on box G. 
C) the push of box G against you. 
D) the upward force of the floor n box G. 
E) the acceleration of box G.

Question 11

An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right.The friction force on this object is 30 N to the left.What is the acceleration of the object?

Accepted Answer

A) 0.27 m/s2 
B) 1.1 m/s2 
C) 2.6 m/s2 
D) 11 m/s2 
A) 0.27 m/s2 
B) 1.1 m/s2 
C) 2.6 m/s2 
D) 11 m/s2

Question 12

A small car and a large SUV are at a stoplight.The car has a mass equal to half that of the SUV,and the SUV can produce a maximum accelerating force equal to twice that of the car.When the light turns green,both drivers push their accelerators to the floor at the same time.Which vehicle pulls ahead of the other vehicle after a few seconds?

Accepted Answer

A) The car pulls ahead. 
B) The SUV pulls ahead. 
C) It is a tie. 
A) The car pulls ahead. 
B) The SUV pulls ahead. 
C) It is a tie.

Question 13

A 45.0-kg person steps on a scale in an elevator.The scale reads 460 N.What is the magnitude of the acceleration of the elevator?

Accepted Answer

A) 4.91 m/s2 
B) 9.81 m/s2 
C) 46.9 m/s2 
D) 0.206 m/s2 
E) 0.422 m/s2 
A) 4.91 m/s2 
B) 9.81 m/s2 
C) 46.9 m/s2 
D) 0.206 m/s2 
E) 0.422 m/s2

Question 14

Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph).

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 15

The figure shows an acceleration-versus-force graph for a 125-g object.What should be the value of the first tick-mark on the vertical scale,as indicated by the arrow in the figure?

Accepted Answer

A) 4 
B) 8 
C) 0.00400 
D) 0.00800 
A) 4 
B) 8 
C) 0.00400 
D) 0.00800

Question 16

If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet,what is the acceleration due to gravity on that planet?

Accepted Answer

A) 70.4 m/s2 
B) 51.4 m/s2 
C) 61.2 m/s2 
D) 81.0 m/s2 
A) 70.4 m/s2 
B) 51.4 m/s2 
C) 61.2 m/s2 
D) 81.0 m/s2

Question 17

The figure shows two boxes,with m1 > m2,that are on a level frictionless surface.We can apply a horizontal force  
Either toward the right on m1 or toward the left on m2.The magnitude of the force that the boxes exert on each other is

Accepted Answer

A) zero newtons in either case. 
B) larger if   is applied toward the right. 
C) larger if   is applied toward the left. 
D) the same in either case. 
A) zero newtons in either case. 
B) larger if   is applied toward the right. 
C) larger if   is applied toward the left. 
D) the same in either case.

Question 18

A net force of 125 N is applied to a certain object.As a result,the object accelerates with an acceleration of 24.0 m/s2.The mass of the object is

Accepted Answer

A) 3000 kg. 
B) 2880 kg. 
C) 144 kg. 
D) 0.200 kg. 
E) 5.21 kg. 
A) 3000 kg. 
B) 2880 kg. 
C) 144 kg. 
D) 0.200 kg. 
E) 5.21 kg.

Question 19

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?

Accepted Answer

A) 69.9 kg 
B) 68.5 kg 
C) 71.3 kg 
D) 72.7 kg 
A) 69.9 kg 
B) 68.5 kg 
C) 71.3 kg 
D) 72.7 kg

Question 20

A certain aircraft has a mass of 300,000 kg.At a certain instant during its landing,its speed is 27.0 m/s.If the braking force is a constant 445,000 N,what is the speed of the airplane 10.0 s later?

Accepted Answer

A) 10.0 m/s 
B) 12.2 m/s 
C) 14.0 m/s 
D) 18.0 m/s 
E) 20.0 m/s 
A) 10.0 m/s 
B) 12.2 m/s 
C) 14.0 m/s 
D) 18.0 m/s 
E) 20.0 m/s

Exam 5: Newtons Laws of Motion

An object is moving with constant non-zero velocity.Which of the following statements about it must be true?

A horse pulls a cart with force .As a result of this force the cart accelerates with constant acceleration.The magnitude of the force that the cart exerts on the horse

A girl attaches a rock to a string,which she then swings counter-clockwise in a horizontal circle.The string breaks at point P in the figure,which shows a bird's-eye view (as seen from above).Which path (A-E)will the rock follow?

In a collision between a huge SUV and a small hybrid car,the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.

An object of weight W is in freefall close to the surface of Earth.The magnitude of the force that the object exerts on Earth is

A car of mass 1100 kg that is traveling at 27 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?

An elevator suspended by a vertical cable is moving downward but slowing down.The tension in the cable must be

You pull on a crate with a rope.If the crate moves,the rope's pull on the crate must have been larger than the crate's pull on the rope,but if the crate does not move,both of these pulls must have been equal.

You push on box G that is next to box H,causing both boxes to slide along the floor,as shown in the figure.The reaction force to your push is

An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right.The friction force on this object is 30 N to the left.What is the acceleration of the object?

A 45.0-kg person steps on a scale in an elevator.The scale reads 460 N.What is the magnitude of the acceleration of the elevator?

Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph).

The figure shows an acceleration-versus-force graph for a 125-g object.What should be the value of the first tick-mark on the vertical scale,as indicated by the arrow in the figure?

If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet,what is the acceleration due to gravity on that planet?

The figure shows two boxes,with m1 > m2,that are on a level frictionless surface.We can apply a horizontal force Either toward the right on m1 or toward the left on m2.The magnitude of the force that the boxes exert on each other is

A net force of 125 N is applied to a certain object.As a result,the object accelerates with an acceleration of 24.0 m/s2.The mass of the object is

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?

A certain aircraft has a mass of 300,000 kg.At a certain instant during its landing,its speed is 27.0 m/s.If the braking force is a constant 445,000 N,what is the speed of the airplane 10.0 s later?

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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If I weigh 741 N on Earth at a place where g = 9.80 m/s² and 5320 N on the surface of another planet,what is the acceleration due to gravity on that planet?

The figure shows two boxes,with m₁ > m₂,that are on a level frictionless surface.We can apply a horizontal force Either toward the right on m₁ or toward the left on m₂.The magnitude of the force that the boxes exert on each other is

A net force of 125 N is applied to a certain object.As a result,the object accelerates with an acceleration of 24.0 m/s².The mass of the object is

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s²?