Question 1

A pot that falls from a ledge and hits the ground 45 m below hits the ground at

Accepted Answer

A)  30 m/s.
B)  60 m/s.
C)  120 m/s.
D)  more than 120 m/s.E) B) and D)
F) A) and D)

Question 2

A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?

Accepted Answer

A)  0.5 m/s2
B)  1 m/s2
C)  2 m/s2
D)  4 m/s2E) C) and D)
F) B) and D)

Question 3

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be

Accepted Answer

A)  10 m/s.
B)  20 m/s.
C)  30 m/s.
D)  40 m/s.E) B) and C)
F) All of the above

Question 4

An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of

Accepted Answer

A)  10 km/h.
B)  70 km/h.
C)  80 km/h.
D)  90 km/h.E) B) and C)
F) B) and D)

Question 5

A vehicle undergoes acceleration when it

Accepted Answer

A)  gains speed.
B)  loses speed.
C)  changes its direction.
D)  all of the aboveE) None of the above
F) A) and D)

Question 6

The accelerations possible for a ball on an inclined plane

Accepted Answer

A)  range from zero to g.
B)  range from g to infinity.
C)  have no limit.D) A) and B)
E) None of the above

Question 7

While an iron block near the Earth's surface is in free fall, it undergoes an increase in

Accepted Answer

A)  speed.
B)  acceleration.
C)  both of these
D)  neither of theseE) A) and B)
F) C) and D)

Question 8

An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of

Accepted Answer

A)  60 km/h.
B)  80 km/h.
C)  100 km/h.
D)  141 km/h.E) B) and C)
F) A) and D)

Question 9

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is

Accepted Answer

A)  zero.
B)  5 m/s.
C)  10 m/s.
D)  15 m/s.
E)  none of the aboveF) B) and C)
G) A) and E)

Question 10

If an object moves with constant acceleration, its velocity must

Accepted Answer

A)  be constant also.
B)  change by the same amount each second.
C)  change by varying amounts depending on its speed.
D)  always decrease.E) A) and B)
F) B) and C)

Question 11

If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by

Accepted Answer

A)  10 m/s.
B)  20 m/s.
C)  30 m/s.
D)  40 m/s.
E)  depends on its initial speedF) A) and E)
G) C) and D) B

Question 12

Compared with hang time on Earth, hang time on the Moon would be

Accepted Answer

A)  less.
B)  the same.
C)  greater.D) None of the above
E) B) and C)

Question 13

Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?

Accepted Answer

A)  the one thrown upward
B)  the one thrown downward
C)  neither, both hit with the same speedD) A) and B)
E) All of the above C

Question 14

A ball rolls along a horizontal track in a certain time. If the track has a dip in it, the time to roll the length of the track will be

Accepted Answer

A)  less.
B)  the same.
C)  more.D) A) and B)
E) None of the above

Question 15

The two measurements necessary for calculating average speed are

Accepted Answer

A)  acceleration and time.
B)  velocity and time.
C)  distance and time.
D)  distance and acceleration.
E)  velocity and distance.F) B) and D)
G) A) and E)

Question 16

An 80-km/h airplane flying in the same direction as a 10 km/h tail wind has a groundspeed of

Accepted Answer

A)  10 km/h.
B)  70 km/h.
C)  80 km/h.
D)  90 km/h.E) A) and B)
F) None of the above D

Question 17

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

Accepted Answer

A)  constant.
B)  less and less each second.
C)  greater than the second before.
D)  doubled.E) B) and D)
F) None of the above

Question 18

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is

Accepted Answer

A)  3 m/s2.
B)  6 m/s2.
C)  60 m/s2.
D)  600 m/s2.E) A) and B)
F) C) and D)

Question 19

A ball is projected 125 meters straight upward and then falls the same distance back to its starting point. Neglecting air resistance, its total time in the air is about

Accepted Answer

A)  5 s.
B)  10 s.
C)  15 s.
D)  more than 20 s.E) All of the above
F) B) and C)

Question 20

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. How far below the level from which it was thrown is the rock 2 seconds later?

Accepted Answer

A)  5 m
B)  10 m
C)  15 m
D)  20 mE) A) and D)
F) All of the above

Exam 3: Linear Motion

A pot that falls from a ledge and hits the ground 45 m below hits the ground at

Correct AnswerverifiedShow Answer

A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?

Correct AnswerverifiedShow Answer

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be

Correct AnswerverifiedShow Answer

An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of

Correct AnswerverifiedShow Answer

A vehicle undergoes acceleration when it

Correct AnswerverifiedShow Answer

The accelerations possible for a ball on an inclined plane

Correct AnswerverifiedShow Answer

While an iron block near the Earth's surface is in free fall, it undergoes an increase in

Correct AnswerverifiedShow Answer

An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of

Correct AnswerverifiedShow Answer

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is

Correct AnswerverifiedShow Answer

If an object moves with constant acceleration, its velocity must

Correct AnswerverifiedShow Answer

If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by

Correct AnswerverifiedB

Compared with hang time on Earth, hang time on the Moon would be

Correct AnswerverifiedShow Answer

Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?

Correct AnswerverifiedC

A ball rolls along a horizontal track in a certain time. If the track has a dip in it, the time to roll the length of the track will be

Correct AnswerverifiedShow Answer

The two measurements necessary for calculating average speed are

Correct AnswerverifiedShow Answer

An 80-km/h airplane flying in the same direction as a 10 km/h tail wind has a groundspeed of

Correct AnswerverifiedD

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

Correct AnswerverifiedShow Answer

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is

Correct AnswerverifiedShow Answer

A ball is projected 125 meters straight upward and then falls the same distance back to its starting point. Neglecting air resistance, its total time in the air is about

Correct AnswerverifiedShow Answer

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. How far below the level from which it was thrown is the rock 2 seconds later?

Correct AnswerverifiedShow Answer

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If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s², then its speed reading would increase each second by

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B

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C

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D

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