question

The distance a freely falling bowling ball falls each second
Select one:
a. is about 10 m.
b. None of these
c. is about 5 m.
d. increases.

answer

increases.

question

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?
Select one:
a. 10 m/s2
b. 4.0 m/s2
c. 2.8 m/s2
d. 0.25 m/s2
e. 40 m/s2

answer

4.0 m/s2 (NOT 40- be careful!)

question

A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the opposite direction has a speed of
Select one:
a. 3 m/s.
b. 0 m/s.
c. 6 m/s.
d. 4 m/s.

answer

0 m/s.

question

If a freely falling object were equipped with a speedometer, its speed reading would increase each second by about
Select one:
a. depends on its initial speed
b. 10 m/s.
c. a variable amount.
d. 15 m/s.
e. 5 m/s.

answer

10 m/s.

question

A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about
Select one:
a. 5 km/h.
b. 4 km/h.
c. more than 5 km/h.
d. 3 km/h.

answer

5 km/h.

question

When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance of
Select one:
a. 2 m.
b. 15 m.
c. 20 m.
d. 10 m.

answer

20 m.

question

A cart maintains a constant velocity of 100 m/s for 10 seconds. During this interval its acceleration is
Select one:
a. 1 m/s2.
b. None of these
c. zero.
d. 10 m/s2.

answer

zero

question

An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is
Select one:
a. 8 m/s2.
b. 0 m/s2.
c. 24 m/s2.
d. 5 m/s2.

answer

0 m/s2.

question

The time it takes a car to attain a speed of 30 m/s when accelerating from rest at 2 m/s2 is
Select one:
a. 30 s.
b. 60 s.
c. 2 s.
d. 15 s
e. None of these

answer

15 s

question

At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately
Select one:
a. 60 m/s.
b. 50 m/s.
c. 55 m/s.
d. 40 m/s.

answer

40 m/s.

question

At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is
Select one:
a. 100 m/s.
b. 50 m/s.
c. 55 m/s.
d. 25 m/s.
e. 60 m/s.

answer

60 m/s.

question

A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank
Select one:
a. 100 m farther south.
b. None of these
c. 141 m farther south.Incorrect
d. due east of its starting point.

answer

100 m farther south.

question

An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of
Select one:
a. 141 km/h.
b. 60 km/h.
c. 100 km/h.
d. 80 km/h.

answer

100 km/h.

question

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of
Select one:
a. 5 m.
b. (100 - 5) m.
c. None of these
d. (100 + 5) m.
e. 100 m.

answer

(100 - 5) m.

question

Neglecting air resistance, a bullet fired straight down from the top of a high cliff has an acceleration of
Select one:
a. depends on the height of the cliff.
b. 10 m/s2.
c. more than 10 m/s2.
d. less than 10 m/s2.

answer

10 m/s2.

question

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is
Select one:
a. 14 m/s.
b. 6 m/s.
c. None of these
d. 10 m/s.

answer

6 m/s.

question

When a ball thrown straight upwards reaches the very top of its path, its acceleration is
Select one:
a. 5 m/s2.
b. zero.
c. None of these
d. 10 m/s2.

answer

10 m/s2.

question

A vehicle undergoes acceleration when it
Select one:
a. loses speed.
b. changes its direction.
c. gains speed.
d. All of these

answer

All of these

question

A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of
Select one:
a. 3 m/s.
b. 0 m/s.
c. 4 m/s.
d. 6 m/s.

answer

6 m/s.

question

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?
Select one:
a. 20 m
b. 15 m
c. 10 m
d. 5 m

answer

10 m

question

An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of
Select one:
a. 90 km/h.
b. 70 km/h.
c. 10 km/h.
d. 80 km/h.

answer

70 km/h.

question

A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
Select one:
a. 10 km/h.
b. 6 km/h.
c. 20 km/h.
d. 8 km/h.

answer

10 km/h.

question

A rock dropped from a 5-m height accelerates at 10 m/s2 and strikes the ground 1 s later. If the rock is dropped from a height of 2.5 m, its acceleration of fall is
Select one:
a. half.
b. four times as much.
c. twice.
d. the same.

answer

the same.

question

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is
Select one:
a. 6 m/s2.
b. 600 m/s2.
c. 60 m/s2.
d. 3 m/s2.

answer

6 m/s2.

question

If an object moves with constant acceleration, its velocity must
Select one:
a. be constant also.
b. change by the same amount each second.
c. change by varying amounts depending on its speed.
d. always decrease.

answer

change by the same amount each second.

question

The average speed of a horse that gallops 10 kilometers in 30 minutes is
Select one:
a. 15 km/h.
b. 20 km/h.
c. 40 km/h.
d. 30 km/h.

answer

20 km/h.

question

An airplane that flies at 100 km/h in a 100-km/h crosswind has a ground speed of
Select one:
a. 0 km/h.
b. 200 km/h.
c. 141 km/h.
d. 100 km/h.

answer

141 km/h.

question

An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as on Earth. In the first 5 seconds it falls a distance of
Select one:
a. 500 m.
b. 150 m.
c. None of these
d. 100 m.
e. 250 m.

answer

250 m.

question

As water drops fall at a steady rate from a leaking faucet they
Select one:
a. get closer together.
b. remain at a relatively fixed distance from one another.
c. get farther apart.

answer

get farther apart.

question

Compared with hang time on Earth, hang time on the Moon would be
Select one:
a. greater.
b. less.
c. the same.

answer

greater.

question

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, two seconds later the rock's speed is
Select one:
a. zero.
b. 15 m/s.
c. None of these
d. 10 m/s.
e. 5 m/s.

answer

15 m/s.

question

If you throw a ball straight downward (in the absence of air resistance), after leaving your hand its acceleration is
Select one:
a. less than 10 m/s2.
b. greater than 10 m/s2.
c. 10 m/s2.

answer

10 m/s2.

question

Which of the following is not a vector quantity?
Select one:
a. none are vector quantities.
b. speed
c. all are vector quantities
d. velocity
e. acceleration

answer

speed

question

A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about
Select one:
a. half as much.
b. four times as much.
c. twice as much.
d. the same.

answer

the same.

question

A bird flying at 8 km/h in a 6-km/h crosswind has a resultant speed of
Select one:
a. 8 km/h.
b. 14 km/h.
c. 6 km/h.
d. 10 km/h.

answer

10 km/h.

question

Neglecting air resistance, a ball projected straight upward so it remains in the air for 10 seconds needs an initial speed of
Select one:
a. 100 m/s.
b. 110 m/s.
c. 80 m/s.
d. 50 m/s.
e. 60 m/s.

answer

50 m/s.

question

The total time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about
Select one:
a. 2 s.
b. 10 s.
c. 20 s.
d. 1 s.

answer

2 s.

question

While a car travels around a circular track at a constant speed, its
Select one:
a. acceleration is zero.
b. None of these
c. velocity is zero.
d. inertia is zero.

answer

None of these

question

An object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s2. After 5 seconds, the object will have a speed of
Select one:
a. 50 m/s.
b. 20 m/s.
c. 100 m/s.
d. 5 m/s.
e. 10 m/s.

answer

100 m/s.

question

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
Select one:
a. 20 m/s.
b. 30 m/s.
c. 10 m/s.
d. 40 m/s.
e. depends on its initial speed

answer

20 m/s.

question

An apple falls from a tree and hits the ground 5 meters below with a speed of about
Select one:
a. 5 m/s.
b. 20 m/s.
c. 15 m/s.
d. not enough information
e. 10 m/s.

answer

10 m/s.

question

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?
Select one:
a. the one thrown upward
b. the one thrown downward
c. neither, both hit with the same speed

answer

c. neither, both hit with the same speed

question

The two measurements necessary for calculating average speed are
Select one:
a. velocity and time.
b. distance and time.
c. acceleration and time.
d. distance and acceleration.
e. velocity and distance.

answer

distance and time.

question

A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of
Select one:
a. more than 20 km/h.
b. 10 km/h.
c. 20 km/h.
d. about 14 km/h.

answer

about 14 km/h.

question

A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be
Select one:
a. less.
b. more.
c. the same.

answer

more.

question

The vertical height attained by a basketball player who achieves a hang time of a full 1 s is about
Select one:
a. 2.5 m.
b. 1 m.
c. 1.2 m.
d. 0.8 m.
e. more than 2.5 m.

answer

1.2 m.

question

The distance a freely falling object falls from rest in one-half second is
Select one:
a. 2 m.
b. 6 m.
c. 4 m.
d. None of these

answer

None of these

question

What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?
Select one:
a. 4 m/s2
b. 1 m/s2
c. 3 m/s2
d. 2 m/s2
e. 5 m/s2

answer

4 m/s2

question

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
Select one:
a. greater than the second before.
b. constant.
c. doubled.
d. less and less each second.

answer

greater than the second before.

question

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
Select one:
a. None of these
b. 5 m/s.
c. 15 m/s.
d. 10 m/s.
e. zero.

answer

5 m/s.

question

The accelerations possible for a ball on an inclined plane
Select one:
a. range from g to infinity.
b. range from zero to g.
c. have no limit.

answer

range from zero to g.

question

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?
Select one:
a. 1 m/s2
b. 0.5 m/s2
c. 4 m/s2
d. 2 m/s2

answer

2 m/s2

question

A freely-falling watermelon falls with constant
Select one:
a. speed.
b. velocity.
c. acceleration.
d. distances each successive second.

answer

acceleration.

question

Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is
Select one:
a. 5 m/s.
b. either depending on her running direction
c. 11 m/s.
d. None of these

answer

either depending on her running direction

question

A ball starting from rest at the top of an inclined plane accelerates at 2 m/s2 and reaches the bottom of the plane in 3 seconds. What is the length of the plane?
Select one:
a. 9 m
b. 5 m
c. 3 m
d. 2 m

answer

9 m

question

While an iron block near the Earth's surface is in free fall, it undergoes an increase in
Select one:
a. speed.
b. acceleration.
c. neither of these
d. both of these

answer

speed.

question

Twelve seconds after starting from rest, a freely-falling cantelope has a speed of
Select one:
a. 10 m/s.
b. 100 m/s.
c. more than 100 m/s.
d. 50 m/s.

answer

more than 100 m/s.

question

Neglecting air resistance, how fast must you toss a ball straight up in order for it to take 6 seconds to return to its initial level?
Select one:
a. 5 m/s
b. 10 m/s
c. 20 m/s
d. more than 30 m/s
e. 30 m/s

answer

30 m/s

question

The speedometer of an automobile reads
Select one:
a. accelerated speed.
b. average speed.
c. instantaneous speed.

answer

instantaneous speed.

question

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is
Select one:
a. 14 m/s.
b. 6 m/s.
c. None of these
d. 10 m/s.

answer

14 m/s.

question

A pot that falls from a ledge and hits the ground 45 m below hits the ground at
Select one:
a. 120 m/s.
b. 30 m/s.
c. 60 m/s.
d. more than 120 m/s.

answer

30 m/s.

question

A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels
Select one:
a. 100 m.
b. 200 m.
c. 141 m.
d. more than 200 m.
e. nowhere.

answer

141 m.

question

An 80-km/h airplane flying in the same direction as a 10 km/h tail wind has a groundspeed of
Select one:
a. 80 km/h.
b. 10 km/h.
c. 70 km/h.
d. 90 km/h.

answer

90 km/h.

question

You're at rest in a hammock when a hungry mosquito sees an opportunity for lunch. A mild 2-m/s breeze is blowing. If the mosquito joins you for lunch it should hover over you by flying
Select one:
a. against the breeze at 2 m/s.
b. None of these
c. with the breeze at 2 m/s.
d. a bit faster than wind speed.

answer

against the breeze at 2 m/s.

question

If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be
Select one:
a. 3600 m/s.
b. 500 m/s.
c. 3000 m/s.
d. 50 m/s.

answer

3000 m/s.

question

One half second after starting from rest, a freely falling object will have a speed of about
Select one:
a. 20 m/s.
b. 2 m/s.
c. 10 m/s.
d. None of these
e. 5 m/s.

answer

5 m/s.

question

A bullet is dropped into a river from a very high bridge at the same time as another bullet is fired straight downward from a rifle. Neglecting air resistance, the acceleration just before striking the water is
Select one:
a. the same for each bullet.
b. greater for the fired bullet.
c. None of these
d. greater for the dropped bullet.

answer

the same for each bullet.

question

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about
Select one:
a. 1 s.
b. not enough information
c. 10 s.
d. 2 s.

answer

1 s.

question

A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is
Select one:
a. 10 m/s2.
b. None of these
c. 1 m/s2.
d. zero.

answer

1 m/s2.

question

A car's speed 3 seconds after accelerating from rest at 2 m/s2 is
Select one:
a. 4 m/s.
b. 2 m/s.
c. 6 m/s.
d. 3 m/s.

answer

6 m/s.

question

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
Select one:
a. less.
b. the same.
c. more.

answer

less.

question

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
Select one:
a. 5 s.
b. more than 20 s.
c. 15 s.
d. 10 s

answer

10 s

question

If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about
Select one:
a. 60 m.
b. 180 m.
c. 120 m.
d. more than 200 m.

answer

180 m.

question

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
Select one:
a. 30 m/s.
b. 10 m/s.
c. 20 m/s.
d. 40 m/s.

answer

20 m/s.

question

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
Select one:
a. in the direction of motion.
b. None of these
c. directed upward.
d. opposite its velocity.
e. directed downward.

answer

directed downward.