Question 1

Calculate the force on a string tied to a ceiling with a 9.0-kg mass attached.

Accepted Answer

88 N

Question 2

Two equal and opposite forces of 6.0 N act on an object. The unbalanced force on the object

Accepted Answer

A)  is 6.0 N. 
B)  is 0 N. 
C)  is 8 N. 
D)  is 12 N. 
E)  cannot be determined from given information. 
A)  is 6.0 N. 
B)  is 0 N. 
C)  is 8 N. 
D)  is 12 N. 
E)  cannot be determined from given information. B

Question 3

A force of 100 N applied to an object produces an acceleration of 4.00 m/s2. Determine the force needed to give the object an acceleration of 16.0 m/s2.

Accepted Answer

400 N

Question 4

A comet is traveling at a speed of 50,000 mi/h when it is 100 million miles from the Sun. Compute its speed when it is 25 million miles from the Sun.

Accepted Answer

The answer of A comet is traveling at a speed...

Question 5

A change in motion requires a(n) ______________.

Accepted Answer

force (unb

Question 6

According to Newton's second law, the force required to accelerate an object is equal to

Accepted Answer

A)  its acceleration divided by its mass. 
B)  its mass times the acceleration. 
C)  its mass divided by the velocity. 
D)  its weight times the velocity. 
A)  its acceleration divided by its mass. 
B)  its mass times the acceleration. 
C)  its mass divided by the velocity. 
D)  its weight times the velocity.

Question 7

______________ principle explains why objects float or sink in a fluid.

Accepted Answer

A)  Newton's 
B)  Pascal's 
C)  Bernoulli's 
D)  Archimedes' 
A)  Newton's 
B)  Pascal's 
C)  Bernoulli's 
D)  Archimedes'

Question 8

The SI base units making up the newton are

Accepted Answer

A)  kg m/s. 
B)  g m/s2. 
C)  kg m/s2. 
D)  kg2/s. 
A)  kg m/s. 
B)  g m/s2. 
C)  kg m/s2. 
D)  kg2/s.

Question 9

The linear momentum of a 100.0 kg object moving around a 30.0 m circle at a constant speed of 2.20 m/s is

Accepted Answer

A)  0.0 N 
B)  220 N 
C)  242 N 
D)  6600 N 
A)  0.0 N 
B)  220 N 
C)  242 N 
D)  6600 N

Question 10

When a net force on a moving object increases, the object will

Accepted Answer

A)  maintain the same velocity. 
B)  always show an increase in speed. 
C)  exhibit a change in speed and/or direction. 
D)  maintain a constant acceleration. 
A)  maintain the same velocity. 
B)  always show an increase in speed. 
C)  exhibit a change in speed and/or direction. 
D)  maintain a constant acceleration.

Question 11

The natural tendency of an object to remain at rest or in uniform straight-line motion is called ______________.

Accepted Answer

The answer of The natural tendency of an object to...

Question 12

In the SI, weight is expressed in units of ______________.

Accepted Answer

The answer of In the SI, weight is expressed in...

Question 13

The total linear momentum of an isolated system of masses remains the same if there are no external ______________ acting on the system.

Accepted Answer

A)  forces 
B)  torques 
C)  unbalanced forces 
D)  unbalanced torques 
A)  forces 
B)  torques 
C)  unbalanced forces 
D)  unbalanced torques

Question 14

Two carts (A's mass = 4.5 kg and B's mass = 1.5 kg) are held against a strong, compressed spring. The carts are released simultaneously, and B moves off to the right with a speed of 2.0 m/s. What is A's initial velocity?

Accepted Answer

0.67 m/s t

Question 15

In an equation, the symbol m generally stands for

Accepted Answer

A)  inertia. 
B)  torque. 
C)  momentum. 
D)  mass. 
E)  meters. 
A)  inertia. 
B)  torque. 
C)  momentum. 
D)  mass. 
E)  meters.

Question 16

"For every action there is an equal and opposite reaction" is a statement of Newton's

Accepted Answer

A)  law of universal gravitation. 
B)  first law. 
C)  second law. 
D)  third law. 
A)  law of universal gravitation. 
B)  first law. 
C)  second law. 
D)  third law.

Question 17

The law of conservation of angular momentum states that the angular momentum of an object remains constant if there are no external ______________ torques acting.

Accepted Answer

The answer of The law of conservation of angular momentum...

Question 18

If an object on Earth weighs 100 N, what is its weight in pounds?

Accepted Answer

A)  22 
B)  100 
C)  10 
D)  220 
E)  450 
A)  22 
B)  100 
C)  10 
D)  220 
E)  450

Question 19

An automobile travels due north with a speed of 77 km/h that is decreasing. All forces considered, the unbalanced force acting on the auto is

Accepted Answer

A)  zero. 
B)  southward. 
C)  northward. 
D)  downward. 
E)  upward. 
A)  zero. 
B)  southward. 
C)  northward. 
D)  downward. 
E)  upward.

Question 20

The acceleration of an object acted on by a net force perpendicular to the direction of the object's original motion

Accepted Answer

A)  causes a change in direction. 
B)  is described by Newton's laws. 
C)  causes a change in velocity. 
D)  all of these 
A)  causes a change in direction. 
B)  is described by Newton's laws. 
C)  causes a change in velocity. 
D)  all of these

Exam 3: Force and Motion

Calculate the force on a string tied to a ceiling with a 9.0-kg mass attached.

Two equal and opposite forces of 6.0 N act on an object. The unbalanced force on the object

A force of 100 N applied to an object produces an acceleration of 4.00 m/s2. Determine the force needed to give the object an acceleration of 16.0 m/s2.

A comet is traveling at a speed of 50,000 mi/h when it is 100 million miles from the Sun. Compute its speed when it is 25 million miles from the Sun.

A change in motion requires a(n) ______________.

According to Newton's second law, the force required to accelerate an object is equal to

______________ principle explains why objects float or sink in a fluid.

The SI base units making up the newton are

The linear momentum of a 100.0 kg object moving around a 30.0 m circle at a constant speed of 2.20 m/s is

When a net force on a moving object increases, the object will

The natural tendency of an object to remain at rest or in uniform straight-line motion is called ______________.

In the SI, weight is expressed in units of ______________.

The total linear momentum of an isolated system of masses remains the same if there are no external ______________ acting on the system.

Two carts (A's mass = 4.5 kg and B's mass = 1.5 kg) are held against a strong, compressed spring. The carts are released simultaneously, and B moves off to the right with a speed of 2.0 m/s. What is A's initial velocity?

In an equation, the symbol m generally stands for

"For every action there is an equal and opposite reaction" is a statement of Newton's

The law of conservation of angular momentum states that the angular momentum of an object remains constant if there are no external ______________ torques acting.

If an object on Earth weighs 100 N, what is its weight in pounds?

An automobile travels due north with a speed of 77 km/h that is decreasing. All forces considered, the unbalanced force acting on the auto is

The acceleration of an object acted on by a net force perpendicular to the direction of the object's original motion

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A force of 100 N applied to an object produces an acceleration of 4.00 m/s². Determine the force needed to give the object an acceleration of 16.0 m/s².