Question 1

A boy holds a bird in his hand. The reaction force to the weight of the bird is the force of the:

Accepted Answer

A)  Earth on the bird. 
B)  bird on the Earth. 
C)  hand on the bird. 
D)  bird on the hand. 
E)  Earth on the hand. 
A)  Earth on the bird. 
B)  bird on the Earth. 
C)  hand on the bird. 
D)  bird on the hand. 
E)  Earth on the hand.

Question 2

The acceleration due to gravity on the moon is only about 1/6 of that on Earth. An astronaut whose weight on Earth is 600 N travels to the lunar surface. His mass as measured on the moon is

Accepted Answer

A)  600 kg 
B)  100 kg 
C)  61.2 kg 
D)  10.0 kg 
E)  360 kg 
A)  600 kg 
B)  100 kg 
C)  61.2 kg 
D)  10.0 kg 
E)  360 kg

Question 3

A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest. The tension in the rope needed to give the object an upward speed of 3.50 m/s in 0.700 s is

Accepted Answer

A)  592 N 
B)  390 N 
C)  200 N 
D)  980 N 
E)  720 N 
A)  592 N 
B)  390 N 
C)  200 N 
D)  980 N 
E)  720 N

Question 4

A physical quantity that is sometimes described as the measure of the resistance of a body to a change in motion is

Accepted Answer

A)  force 
B)  mass 
C)  acceleration 
D)  weight 
E)  friction 
A)  force 
B)  mass 
C)  acceleration 
D)  weight 
E)  friction

Question 5

An 80-kg man on ice skates pushes a 40-kg boy, also on skates, with a force of 100 N. The force exerted by the boy on the man is

Accepted Answer

A)  200 N 
B)  100 N 
C)  50 N 
D)  40 N 
E)  zero unless the boy pushes back 
A)  200 N 
B)  100 N 
C)  50 N 
D)  40 N 
E)  zero unless the boy pushes back

Question 6

In the cgs system, the units of force are

Accepted Answer

A)  g · cm 
B)  g · cm2/s2  
C)  g · cm/s2  
D)  g · s/cm 
E)  cm · s2  
A)  g · cm 
B)  g · cm2/s2  
C)  g · cm/s2  
D)  g · s/cm 
E)  cm · s2

Question 7

An object is moving to the right at a constant speed. Which one of the following statements must be correct?

Accepted Answer

A)  No forces are acting on the object. 
B)  A larger number of forces are acting on the object to the right than to the left. 
C)  The net force acting on the object is to the right. 
D)  No net force is acting on the object. 
E)  Just one force is acting on the object, and it is acting downward. 
A)  No forces are acting on the object. 
B)  A larger number of forces are acting on the object to the right than to the left. 
C)  The net force acting on the object is to the right. 
D)  No net force is acting on the object. 
E)  Just one force is acting on the object, and it is acting downward.

Question 8

The tension in the left-hand string in terms of $\theta$1, $\theta$2, and m is

Accepted Answer

A)  mg $\times$ cos $\theta$1 / (sin $\theta$1 sin $\theta$2 + cos $\theta$1 cos $\theta$2 ) 
B)  mg $\times$ sin $\theta$2 / (sin $\theta$1 sin $\theta$2 + cos $\theta$1 cos $\theta$2 ) 
C)  mg $\times$ cos $\theta$2 / (sin $\theta$1 sin $\theta$2 + cos $\theta$1 cos $\theta$2 ) 
D)  mg $\times$ cos $\theta$2 / (sin $\theta$1 cos $\theta$2 + cos $\theta$1 sin $\theta$2 ) 
A)  mg $\times$ cos $\theta$1 / (sin $\theta$1 sin $\theta$2 + cos $\theta$1 cos $\theta$2 ) 
B)  mg $\times$ sin $\theta$2 / (sin $\theta$1 sin $\theta$2 + cos $\theta$1 cos $\theta$2 ) 
C)  mg $\times$ cos $\theta$2 / (sin $\theta$1 sin $\theta$2 + cos $\theta$1 cos $\theta$2 ) 
D)  mg $\times$ cos $\theta$2 / (sin $\theta$1 cos $\theta$2 + cos $\theta$1 sin $\theta$2 )

Question 9

If you apply the same force to objects with masses M and 4M, the acceleration of the mass M is

Accepted Answer

A)  the same as for the mass 4M. 
B)  four times the acceleration of the mass 4M. 
C)  one-fourth the acceleration of the mass 4M. 
D)  twice the acceleration of the mass 4M. 
E)  one-half the acceleration of the mass 4M. 
A)  the same as for the mass 4M. 
B)  four times the acceleration of the mass 4M. 
C)  one-fourth the acceleration of the mass 4M. 
D)  twice the acceleration of the mass 4M. 
E)  one-half the acceleration of the mass 4M.

Question 10

You want to elope by sliding down a nylon rope made by tying stockings together. The rope will withstand a maximum tension of 300 N without breaking. Your mass is 61.2 kg. The magnitude of the smallest acceleration a with which you can slide down the rope is

Accepted Answer

A)  9.81 m/s2  
B)  4.91 m/s2  
C)  zero 
D)  2.40 m/s2  
E)  19.6 m/s2  
A)  9.81 m/s2  
B)  4.91 m/s2  
C)  zero 
D)  2.40 m/s2  
E)  19.6 m/s2

Question 11

Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m1 = 2 m2 = 3 m3, with m1 on the left and m3 on the right. If the pulling force is equal to 90 N, then the tension in the cord between m1 and m2 is

Accepted Answer

A)  49 N 
B)  15 N 
C)  100 N 
D)  44 N 
E)  85 N 
A)  49 N 
B)  15 N 
C)  100 N 
D)  44 N 
E)  85 N

Question 12

A mass of 25 kg is acted on by two forces:   1 is 15 N due east, and   2 is 10 N due north. The acceleration of the mass is

Accepted Answer

A)  0.72 m/s2, 56.3º north of east. 
B)  0.20 m/s2, due east. 
C)  0.72 m/s2, 33.7º north of east. 
D)  1.0 m/s2, 33.7º north of east. 
E)  0.20 m/s2, 56.3º north of east. 
A)  0.72 m/s2, 56.3º north of east. 
B)  0.20 m/s2, due east. 
C)  0.72 m/s2, 33.7º north of east. 
D)  1.0 m/s2, 33.7º north of east. 
E)  0.20 m/s2, 56.3º north of east.

Question 13

Two masses m1 = 12 kg and m2 = 35 kg are held connected by a massless rope hung over a frictionless light pulley. If the masses are released then the magnitude of the tension in the string is

Accepted Answer

A)  343 N 
B)  58.0 N 
C)  226 N 
D)  458 N 
E)  175 N 
A)  343 N 
B)  58.0 N 
C)  226 N 
D)  458 N 
E)  175 N

Question 14

A body moves with constant speed in a straight line. Which of the following statements must be true?

Accepted Answer

A)  No force acts on the body. 
B)  A single constant force acts on the body in the direction of motion. 
C)  A single constant force acts on the body in the direction opposite to the motion. 
D)  A net force of zero acts on the body. 
E)  A constant net force acts on the body in the direction of motion. 
A)  No force acts on the body. 
B)  A single constant force acts on the body in the direction of motion. 
C)  A single constant force acts on the body in the direction opposite to the motion. 
D)  A net force of zero acts on the body. 
E)  A constant net force acts on the body in the direction of motion.

Question 15

According to Newton's law of inertia,

Accepted Answer

A)  objects moving with an initial speed relative to a given frame of reference eventually come to rest relative to the reference frame. 
B)  whether an object is at rest or is moving with constant velocity depends on the inertial reference frame in which the object is observed. 
C)  rest is the most natural state of motion. 
D)  an object at rest in a given frame of reference eventually finds itself in motion relative to the frame of reference. 
E)  forces always exist in pairs. 
A)  objects moving with an initial speed relative to a given frame of reference eventually come to rest relative to the reference frame. 
B)  whether an object is at rest or is moving with constant velocity depends on the inertial reference frame in which the object is observed. 
C)  rest is the most natural state of motion. 
D)  an object at rest in a given frame of reference eventually finds itself in motion relative to the frame of reference. 
E)  forces always exist in pairs.

Question 16

For this problem, assume no friction. A mass m2 = 3.5 kg rests on a horizontal table and is attached by strings to masses m1 = 1.5 kg and m3 = 2.5 kg as shown. The masses m1 and m3 hang freely. The system is initially held at rest. After it is released, the acceleration of mass m2 will be

Accepted Answer

A)  zero 
B)  1.3 m/s2  
C)  5.2 m/s2  
D)  8.7 m/s2  
E)  9.8 m/s2  
A)  zero 
B)  1.3 m/s2  
C)  5.2 m/s2  
D)  8.7 m/s2  
E)  9.8 m/s2

Question 17

A force F produces an acceleration a on an object of mass m. A force 3F is exerted on a second object, and an acceleration 8a results. What is the mass of the second object?

Accepted Answer

A)  3m 
B)  9m 
C)  24m 
D)  (3/8)m 
E)  (8/3)m 
A)  3m 
B)  9m 
C)  24m 
D)  (3/8)m 
E)  (8/3)m

Question 18

We all know it makes sense to bend one's knees when dropping from a height.
Suppose a very silly 70-kg person were instead to drop down from a height of 1.4 m onto the ground and stop stiffly within a distance of only 0.60 cm. Calculate how many times his own weight is the average force his body feels.

Accepted Answer

A)  15 
B)  24 
C)  2.3 $\times$ 103  
D)  6.1 $\times$ 102  
E)  2.3 $\times$ 102  
A)  15 
B)  24 
C)  2.3 $\times$ 103  
D)  6.1 $\times$ 102  
E)  2.3 $\times$ 102

Question 19

A ball of mass 2.0 kg is acted on by two forces,   and   . At t = 0 s, the particle is at rest at the origin. The position vector at t = 2 s is

Accepted Answer

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

Question 20

When Newton's first law of motion is mentioned, you should immediately think of

Accepted Answer

A)    
B)  action-and-reaction forces. 
C)  inertia. 
D)  gravitational forces. 
E)  centripetal acceleration. 
A)    
B)  action-and-reaction forces. 
C)  inertia. 
D)  gravitational forces. 
E)  centripetal acceleration.

A boy holds a bird in his hand. The reaction force to the weight of the bird is the force of the:

The acceleration due to gravity on the moon is only about 1/6 of that on Earth. An astronaut whose weight on Earth is 600 N travels to the lunar surface. His mass as measured on the moon is

A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest. The tension in the rope needed to give the object an upward speed of 3.50 m/s in 0.700 s is

A physical quantity that is sometimes described as the measure of the resistance of a body to a change in motion is

An 80-kg man on ice skates pushes a 40-kg boy, also on skates, with a force of 100 N. The force exerted by the boy on the man is

In the cgs system, the units of force are

An object is moving to the right at a constant speed. Which one of the following statements must be correct?

$The tension in the left-hand string in terms of \theta <sub>1</sub>, \theta <sub>2</sub>, and m is$ The tension in the left-hand string in terms of $\theta$ ₁, $\theta$ ₂, and m is

If you apply the same force to objects with masses M and 4M, the acceleration of the mass M is

You want to elope by sliding down a nylon rope made by tying stockings together. The rope will withstand a maximum tension of 300 N without breaking. Your mass is 61.2 kg. The magnitude of the smallest acceleration a with which you can slide down the rope is

Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m₁ = 2 m₂ = 3 m₃, with m₁ on the left and m₃ on the right. If the pulling force is equal to 90 N, then the tension in the cord between m₁ and m₂ is

A mass of 25 kg is acted on by two forces: ₁ is 15 N due east, and ₂ is 10 N due north. The acceleration of the mass is

Two masses m₁ = 12 kg and m₂ = 35 kg are held connected by a massless rope hung over a frictionless light pulley. If the masses are released then the magnitude of the tension in the string is

A body moves with constant speed in a straight line. Which of the following statements must be true?

According to Newton's law of inertia,

For this problem, assume no friction. A mass m₂ = 3.5 kg rests on a horizontal table and is attached by strings to masses m₁= 1.5 kg and m₃= 2.5 kg as shown. The masses m₁ and m₃ hang freely. The system is initially held at rest. After it is released, the acceleration of mass m₂ will be

A force F produces an acceleration a on an object of mass m. A force 3F is exerted on a second object, and an acceleration 8a results. What is the mass of the second object?

A ball of mass 2.0 kg is acted on by two forces, and . At t = 0 s, the particle is at rest at the origin. The position vector at t = 2 s is

When Newton's first law of motion is mentioned, you should immediately think of

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Applications of Newtons Laws

Work and Energy

Conservation of Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Conservation of Angular Momentum

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

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Exam 4: Newtons Laws

A boy holds a bird in his hand. The reaction force to the weight of the bird is the force of the:

The acceleration due to gravity on the moon is only about 1/6 of that on Earth. An astronaut whose weight on Earth is 600 N travels to the lunar surface. His mass as measured on the moon is

A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest. The tension in the rope needed to give the object an upward speed of 3.50 m/s in 0.700 s is

A physical quantity that is sometimes described as the measure of the resistance of a body to a change in motion is

An 80-kg man on ice skates pushes a 40-kg boy, also on skates, with a force of 100 N. The force exerted by the boy on the man is

In the cgs system, the units of force are

An object is moving to the right at a constant speed. Which one of the following statements must be correct?

The tension in the left-hand string in terms of θ\thetaθ 1, θ\thetaθ 2, and m is

If you apply the same force to objects with masses M and 4M, the acceleration of the mass M is

You want to elope by sliding down a nylon rope made by tying stockings together. The rope will withstand a maximum tension of 300 N without breaking. Your mass is 61.2 kg. The magnitude of the smallest acceleration a with which you can slide down the rope is

Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m1 = 2 m2 = 3 m3, with m1 on the left and m3 on the right. If the pulling force is equal to 90 N, then the tension in the cord between m1 and m2 is

A mass of 25 kg is acted on by two forces: 1 is 15 N due east, and 2 is 10 N due north. The acceleration of the mass is

Two masses m1 = 12 kg and m2 = 35 kg are held connected by a massless rope hung over a frictionless light pulley. If the masses are released then the magnitude of the tension in the string is

A body moves with constant speed in a straight line. Which of the following statements must be true?

According to Newton's law of inertia,

For this problem, assume no friction. A mass m2 = 3.5 kg rests on a horizontal table and is attached by strings to masses m1 = 1.5 kg and m3 = 2.5 kg as shown. The masses m1 and m3 hang freely. The system is initially held at rest. After it is released, the acceleration of mass m2 will be

A force F produces an acceleration a on an object of mass m. A force 3F is exerted on a second object, and an acceleration 8a results. What is the mass of the second object?

A ball of mass 2.0 kg is acted on by two forces, and . At t = 0 s, the particle is at rest at the origin. The position vector at t = 2 s is

When Newton's first law of motion is mentioned, you should immediately think of

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Applications of Newtons Laws

Work and Energy

Conservation of Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Conservation of Angular Momentum

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

Filters

$The tension in the left-hand string in terms of \theta <sub>1</sub>, \theta <sub>2</sub>, and m is$ The tension in the left-hand string in terms of $\theta$ ₁, $\theta$ ₂, and m is

Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m₁ = 2 m₂ = 3 m₃, with m₁ on the left and m₃ on the right. If the pulling force is equal to 90 N, then the tension in the cord between m₁ and m₂ is

A mass of 25 kg is acted on by two forces: ₁ is 15 N due east, and ₂ is 10 N due north. The acceleration of the mass is

Two masses m₁ = 12 kg and m₂ = 35 kg are held connected by a massless rope hung over a frictionless light pulley. If the masses are released then the magnitude of the tension in the string is

For this problem, assume no friction. A mass m₂ = 3.5 kg rests on a horizontal table and is attached by strings to masses m₁= 1.5 kg and m₃= 2.5 kg as shown. The masses m₁ and m₃ hang freely. The system is initially held at rest. After it is released, the acceleration of mass m₂ will be