Question 1

An example of an inertial reference frame is:

Accepted Answer

A)  any reference frame that is not accelerating
B)  a frame attached to a particle on which there are no forces
C)  any reference frame that is at rest
D)  a reference frame attached to the center of the universe
E)  a reference frame attached to the Earth B

Question 2

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 °\degree°  above the horizontal.The mass of the crate is:

Accepted Answer

A)  3.3 kg
B)  3.8 kg
C)  5.7 kg
D)  6.5 kg
E)  160 kg

Question 3

A newton is the force:

Accepted Answer

A)  of gravity on a 1 kg body
B)  of gravity on a 1 g body
C)  that gives a l g body an acceleration of 1 cm/s2
D)  that gives a 1 kg body an acceleration of 1 m/s2
E)  that gives a 1 kg body an acceleration of 9.8 m/s2

Question 4

Two blocks are connected by a string and pulley as shown.Assuming that the string and pulley are massless, the magnitude of the acceleration of each block is: 2 B) 0.020 m/s2 C) 0.0098 m/s2 D) 0.54 m/s2 E) 0.98 m/s2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0.049 m/s2
B)  0.020 m/s2
C)  0.0098 m/s2
D)  0.54 m/s2
E)  0.98 m/s2 E

Question 5

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west.The magnitude of the acceleration of the crate is:

Accepted Answer

A)  0.50 m/s2
B)  2.0 m/s2
C)  2.8 m/s2
D)  10 m/s2
E)  50 m/s2

Question 6

An object rests on a horizontal frictionless surface.A net horizontal force of magnitude F is applied.This force produces an acceleration:

Accepted Answer

A)  only if F is larger than the weight of the object
B)  only while the object suddenly changes from rest to motion
C)  always
D)  only if the inertia of the object decreases
E)  only if F is increasing

Question 7

A massless rope passes over a massless pulley suspended from the ceiling.A 4-kg block is attached to one end and a 5-kg block is attached to the other end.The acceleration of the 5-kg block is:

Accepted Answer

A)  g/4
B)  5g/9
C)  4g/9
D)  g/5
E)  g/9

Question 8

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2.The tension in the cable is:

Accepted Answer

A)  4900 N
B)  11,000 N
C)  16,000 N
D)  21,000 N
E)  48,000 N

Question 9

A feather and a lead ball are dropped from rest in vacuum on the Moon.The acceleration of the feather is:

Accepted Answer

A)  more than that of the lead ball
B)  the same as that of the lead ball
C)  less than that of the lead ball
D)  9.8 m/s2
E)  zero since it floats in a vacuum

Question 10

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest.The change in speed of this object will be:

Accepted Answer

A)  0.5 m/s
B)  2 m/s
C)  4 m/s
D)  8 m/s
E)  32 m/s

Question 11

A 1-N pendulum bob is held at an angle  θ	hetaθ from the vertical by a 2-N horizontal force F as shown.The tension in the string supporting the pendulum bob is:

Accepted Answer

A)  2/N
B)  2 N
C)  N
D)  1 N
E)  none of these

Question 12

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 °\degree°  below the horizontal, the magnitude of the normal force of the floor on the crate is:

Accepted Answer

A)  25 N
B)  68 N
C)  180 N
D)  250 N
E)  310 N

Question 13

Mass differs from weight in that:

Accepted Answer

A)  all objects have weight but some lack mass
B)  weight is a force and mass is not
C)  the mass of an object is always more than its weight
D)  mass can only be expressed in the metric system
E)  there is no difference

Question 14

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown.The tension in the string is:

Accepted Answer

A)  210 N
B)  290 N
C)  410 N
D)  500 N
E)  4900 N

Question 15

Which of the following is a correct statement of Newton's first law?

Accepted Answer

A)  An object in motion will continue in motion at a constant speed unless acted on by a net external force.
B)  An object at rest will stay at rest unless acted on by a net internal force.
C)  An object in motion will continue in motion at a constant velocity unless acted on by a net internal force.
D)  An object in motion will continue in motion at a constant velocity unless acted on by a net external force.
E)  Everything has inertia.

Question 16

Three books (X, Y, and Z) rest on a table.The weight of each book is indicated.The force of book Z on book Y is:

Accepted Answer

A)  0 N
B)  5 N
C)  9 N
D)  14 N
E)  19 N

Question 17

A car travels east at constant velocity.The net force on the car is:

Accepted Answer

A)  east
B)  west
C)  up
D)  down
E)  zero

Question 18

A 6-kg object is moving south.A net force of 12 N north on it result in the object having an acceleration of:

Accepted Answer

A)  2 m/s2, north
B)  2 m/s2, south
C)  6 m/s2, north
D)  18 m/s2, north
E)  18 m/s2, south

Question 19

A 25-N crate slides down a frictionless incline that is 25 °\degree°  above the horizontal.The magnitude of the normal force of the incline on the crate is:

Accepted Answer

A)  11 N
B)  23 N
C)  25 N
D)  100 N
E)  220 N

Question 20

Acceleration is always in the direction:

Accepted Answer

A)  of the displacement
B)  of the initial velocity
C)  of the final velocity
D)  of the net force
E)  opposite to the frictional force D

Exam 5: Force and Motion I

An example of an inertial reference frame is:

Correct Answer
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B

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 $\degree$ above the horizontal.The mass of the crate is:

Correct Answer
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A newton is the force:

Correct Answer
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Two blocks are connected by a string and pulley as shown.Assuming that the string and pulley are massless, the magnitude of the acceleration of each block is:

Correct Answer
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E

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west.The magnitude of the acceleration of the crate is:

Correct Answer
verified

An object rests on a horizontal frictionless surface.A net horizontal force of magnitude F is applied.This force produces an acceleration:

Correct Answer
verified

A massless rope passes over a massless pulley suspended from the ceiling.A 4-kg block is attached to one end and a 5-kg block is attached to the other end.The acceleration of the 5-kg block is:

Correct Answer
verified

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s².The tension in the cable is:

Correct Answer
verified

A feather and a lead ball are dropped from rest in vacuum on the Moon.The acceleration of the feather is:

Correct Answer
verified

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest.The change in speed of this object will be:

Correct Answer
verified

Correct Answer
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When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 $\degree$ below the horizontal, the magnitude of the normal force of the floor on the crate is:

Correct Answer
verified

Mass differs from weight in that:

Correct Answer
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Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown.The tension in the string is:

Correct Answer
verified

Which of the following is a correct statement of Newton's first law?

Correct Answer
verified

Three books (X, Y, and Z) rest on a table.The weight of each book is indicated.The force of book Z on book Y is:

Correct Answer
verified

A car travels east at constant velocity.The net force on the car is:

Correct Answer
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A 6-kg object is moving south.A net force of 12 N north on it result in the object having an acceleration of:

Correct Answer
verified

A 25-N crate slides down a frictionless incline that is 25 $\degree$ above the horizontal.The magnitude of the normal force of the incline on the crate is:

Correct Answer
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Acceleration is always in the direction:

Correct Answer
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D

Exam 5: Force and Motion I

An example of an inertial reference frame is:

Correct AnswerverifiedB

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 °\degree° above the horizontal.The mass of the crate is:

Correct AnswerverifiedShow Answer

A newton is the force:

Correct AnswerverifiedShow Answer

Two blocks are connected by a string and pulley as shown.Assuming that the string and pulley are massless, the magnitude of the acceleration of each block is:

Correct AnswerverifiedE

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west.The magnitude of the acceleration of the crate is:

Correct AnswerverifiedShow Answer

An object rests on a horizontal frictionless surface.A net horizontal force of magnitude F is applied.This force produces an acceleration:

Correct AnswerverifiedShow Answer

A massless rope passes over a massless pulley suspended from the ceiling.A 4-kg block is attached to one end and a 5-kg block is attached to the other end.The acceleration of the 5-kg block is:

Correct AnswerverifiedShow Answer

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2.The tension in the cable is:

Correct AnswerverifiedShow Answer

A feather and a lead ball are dropped from rest in vacuum on the Moon.The acceleration of the feather is:

Correct AnswerverifiedShow Answer

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest.The change in speed of this object will be:

Correct AnswerverifiedShow Answer

A 1-N pendulum bob is held at an angle θ\thetaθ from the vertical by a 2-N horizontal force F as shown.The tension in the string supporting the pendulum bob is:

Correct AnswerverifiedShow Answer

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 °\degree° below the horizontal, the magnitude of the normal force of the floor on the crate is:

Correct AnswerverifiedShow Answer

Mass differs from weight in that:

Correct AnswerverifiedShow Answer

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown.The tension in the string is:

Correct AnswerverifiedShow Answer

Which of the following is a correct statement of Newton's first law?

Correct AnswerverifiedShow Answer

Three books (X, Y, and Z) rest on a table.The weight of each book is indicated.The force of book Z on book Y is:

Correct AnswerverifiedShow Answer

A car travels east at constant velocity.The net force on the car is:

Correct AnswerverifiedShow Answer

A 6-kg object is moving south.A net force of 12 N north on it result in the object having an acceleration of:

Correct AnswerverifiedShow Answer

A 25-N crate slides down a frictionless incline that is 25 °\degree° above the horizontal.The magnitude of the normal force of the incline on the crate is:

Correct AnswerverifiedShow Answer

Acceleration is always in the direction:

Correct AnswerverifiedD

Correct Answer
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B

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 $\degree$ above the horizontal.The mass of the crate is:

Correct Answer
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Correct Answer
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Correct Answer
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E

Correct Answer
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Correct Answer
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Correct Answer
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A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s².The tension in the cable is:

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 $\degree$ below the horizontal, the magnitude of the normal force of the floor on the crate is:

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A 25-N crate slides down a frictionless incline that is 25 $\degree$ above the horizontal.The magnitude of the normal force of the incline on the crate is:

Correct Answer
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Correct Answer
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D