Question 1

An object will ______________ in a fluid if its average density is ______________ the density of the fluid.

Accepted Answer

A)  sink; greater than 
B)  float; equal to 
C)  sink; less than 
D)  float; twice 
A)  sink; greater than 
B)  float; equal to 
C)  sink; less than 
D)  float; twice A

Question 2

Mass is a measure of

Accepted Answer

A)  inertia. 
B)  force. 
C)  grams. 
D)  weight. 
E)  kilograms. 
A)  inertia. 
B)  force. 
C)  grams. 
D)  weight. 
E)  kilograms. A

Question 3

An automobile travels due north with a speed of 68 km/h and an acceleration of 1.5 m/s2.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. C

Question 4

It is generally easier to push an object once it is moving than when one is getting it started.Why is this?

Accepted Answer

Sliding fr

Question 5

In the equation A = B/C,the B and C are said to be _______________ proportional.

Accepted Answer

A)  directly 
B)  inversely 
C)  not 
D)  exactly 
A)  directly 
B)  inversely 
C)  not 
D)  exactly

Question 6

Which of the following would be different for a person on the Moon rather than on Earth?

Accepted Answer

A)  Weight 
B)  Height 
C)  Volume 
D)  Mass 
A)  Weight 
B)  Height 
C)  Volume 
D)  Mass

Question 7

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

Question 8

If an object of mass 8 kg has a velocity of 7 m/s,what is its linear momentum?

Accepted Answer

A)  56 kg-m/s 
B)  1.1 kg-m/s 
C)  0.88 kg-m/s 
D)  15 kg-m/s 
E)  cannot be determined 
A)  56 kg-m/s 
B)  1.1 kg-m/s 
C)  0.88 kg-m/s 
D)  15 kg-m/s 
E)  cannot be determined

Question 9

Newton's law of gravitation applies to all ______________.

Accepted Answer

The answer of Newton's law of gravitation applies to all...

Question 10

An object will ______________ in a fluid if its average density is ______________ the density of the fluid.

Accepted Answer

A)  float; greater than 
B)  float; less than 
C)  sink; less than 
D)  sink; equal to 
A)  float; greater than 
B)  float; less than 
C)  sink; less than 
D)  sink; equal to

Question 11

An automobile air bag

Accepted Answer

A)  increases the contact time in stopping a person. 
B)  reduces the impact force in a collision. 
C)  increases the surface area of the impact force. 
D)  does all of the above. 
A)  increases the contact time in stopping a person. 
B)  reduces the impact force in a collision. 
C)  increases the surface area of the impact force. 
D)  does all of the above.

Question 12

What is the mass in kilograms of an astronaut on the Moon who weighs 185 lb on Earth?

Accepted Answer

The answer of What is the mass in kilograms of...

Question 13

An indication of an object's inertia is given by its ______________.

Accepted Answer

The answer of An indication of an object's inertia is...

Question 14

The force required to move a 90.0 kg object in a 85.0 m circle at a constant speed of 8.10 m/s is

Accepted Answer

A)  0.0 N 
B)  69.5 N 
C)  0.77 N 
D)  8.58 N 
A)  0.0 N 
B)  69.5 N 
C)  0.77 N 
D)  8.58 N

Question 15

To increase the force of gravity between two masses by a factor of 9,how would the objects have to be moved?

Accepted Answer

3 times cl

Question 16

The buoyant force of an object is equal to the ______________ of the ______________ it displaces.

Accepted Answer

A)  mass; fluid 
B)  weight; fluid 
C)  mass; solid 
D)  weight; solid 
A)  mass; fluid 
B)  weight; fluid 
C)  mass; solid 
D)  weight; solid

Question 17

A mass is accelerated when ______________ acts upon the mass.

Accepted Answer

A)  a balanced force 
B)  any force 
C)  no force 
D)  an unbalanced force 
E)  none of these 
A)  a balanced force 
B)  any force 
C)  no force 
D)  an unbalanced force 
E)  none of these

Question 18

When you push on a stationary object on a horizontal surface and it doesn't move,what kind of force is most likely opposing your efforts?

Accepted Answer

A)  Static friction force 
B)  Sliding friction force 
C)  Lubricant friction force 
D)  Gravitational force 
E)  Normal Force 
A)  Static friction force 
B)  Sliding friction force 
C)  Lubricant friction force 
D)  Gravitational force 
E)  Normal Force

Question 19

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 20

A(n)______________ force is necessary for uniform circular motion.

Accepted Answer

The answer of A(n)______________ force is necessary for uniform circular...

Exam 3: Force and Motion

An object will ______________ in a fluid if its average density is ______________ the density of the fluid.

Mass is a measure of

An automobile travels due north with a speed of 68 km/h and an acceleration of 1.5 m/s2.All forces considered,the unbalanced force acting on the auto is

It is generally easier to push an object once it is moving than when one is getting it started.Why is this?

In the equation A = B/C,the B and C are said to be _______________ proportional.

Which of the following would be different for a person on the Moon rather than on Earth?

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

If an object of mass 8 kg has a velocity of 7 m/s,what is its linear momentum?

Newton's law of gravitation applies to all ______________.

An object will ______________ in a fluid if its average density is ______________ the density of the fluid.

An automobile air bag

What is the mass in kilograms of an astronaut on the Moon who weighs 185 lb on Earth?

An indication of an object's inertia is given by its ______________.

The force required to move a 90.0 kg object in a 85.0 m circle at a constant speed of 8.10 m/s is

To increase the force of gravity between two masses by a factor of 9,how would the objects have to be moved?

The buoyant force of an object is equal to the ______________ of the ______________ it displaces.

A mass is accelerated when ______________ acts upon the mass.

When you push on a stationary object on a horizontal surface and it doesn't move,what kind of force is most likely opposing your efforts?

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

A(n)______________ force is necessary for uniform circular motion.

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An object will in a fluid if its average density is the density of the fluid.

An automobile travels due north with a speed of 68 km/h and an acceleration of 1.5 m/s².All forces considered,the unbalanced force acting on the auto is

An object will in a fluid if its average density is the density of the fluid.

The buoyant force of an object is equal to the of the it displaces.