Physics B grade A Q&A
The rate at which velocity changes with time is called acceleration. - (CORRECT
ANSWER)True
Which of the following objects has an average velocity of 0 m/s? - (CORRECT
ANSWER)A runner makes one complete lap around the track at a constant speed.
Which of the following increases when an object is in free fall? - (CORRECT
ANSWER)velocity
A car accelerates at 2 m/s/s. Assuming the car starts from rest, how much time does
it need to accelerate to a speed of 20 m/s? - (CORRECT ANSWER)10 seconds
The unit of velocity is the meter. - (CORRECT ANSWER)False
Unless stated otherwise, when we discuss the speed of things, we mean with
respect to the surface of the Earth. - (CORRECT ANSWER)True
If you drop a feather and a bowling ball in a tube filled with air, which will reach the
bottom of the tube first? - (CORRECT ANSWER)bowling ball
Velocity is different from speed in that velocity is speed in a given direction. -
(CORRECT ANSWER)True
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's
average acceleration? - (CORRECT ANSWER)6 m/s ^2
Which of the following remains constant when an object is in free fall? - (CORRECT
ANSWER)acceleration
Consider the plot shown at the right. Which of the motions is consistent with the
graph?
Straight line in the positive area - (CORRECT ANSWER)The object is moving in the
positive direction with a constant speed and no acceleration.
A ball is thrown upwards and caught when it comes back down. Assuming the ball is
in free fall, the speed of the ball when caught would be - (CORRECT ANSWER)the
same as the speed it had when thrown upwards.
Which of the quantities are vector quantities? - (CORRECT ANSWER)displacement,
velocity, acceleration
It is possible to remain at a constant speed and still have a changing velocity. -
(CORRECT ANSWER)True
The acceleration due to gravity symbolized by the letter g has a value on Earth's
surface that is close to what value? - (CORRECT ANSWER)about 10 m/s/s down
, Consider the plot shown at the right. Which description below is consistent with the
graph?
Straight line then goes down - (CORRECT ANSWER)The object is at rest and then
moves in the negative direction at a constant speed.
Which one of the following characteristics is true of all accelerating objects? -
(CORRECT ANSWER)Accelerating objects are changing their velocity.
A ball is thrown straight up. At the top of its path its instantaneous speed is -
(CORRECT ANSWER)0 m/s
For which one of the following motions is the object's displacement different than the
distance traveled? - (CORRECT ANSWER)After a home run, a baseball player runs
all the way around the bases.
Acceleration is defined as the change in - (CORRECT ANSWER)velocity divided by
the time interval.
Distance and speed are scalar quantities. - (CORRECT ANSWER)True
A free falling object falls for 4 seconds. What distance did it travel? - (CORRECT
ANSWER)80 m
A train travels 6 meters in the first second of travel, 6 meters againd during the
second of travel, and 6 meters again during the third second. What is it's
acceleration? - (CORRECT ANSWER)0 m/s ^2
Speed is - (CORRECT ANSWER)- a measure of how fast something is moving.
- always measured in terms of a unit of distance divided by a unit of time.
- the distance covered per unit time
Suppose you take a trip that covers 180 km and takes 3 hours to make. Calculate
the average speed. - (CORRECT ANSWER)60 km/hr
A possible unit of speed is - (CORRECT ANSWER)miles per hour
light years per century
kilometers per hour
A ball is thrown straight up. At the top of its path, its acceleration is - (CORRECT
ANSWER)about 10 m/s/s down
Suppose a car is moving in a straight line and steadily increases its speed. It moves
from 35 km/hr to 40 km/hr the first second and from 40 km/hr to 45 km/hr the next
second. What is the cars acceleration? - (CORRECT ANSWER)5 km/hr/s
An object in free fall starts from rest. After falling for 6 seconds, it will have a speed
of approximately how much? - (CORRECT ANSWER)60 m/s
The rate at which velocity changes with time is called acceleration. - (CORRECT
ANSWER)True
Which of the following objects has an average velocity of 0 m/s? - (CORRECT
ANSWER)A runner makes one complete lap around the track at a constant speed.
Which of the following increases when an object is in free fall? - (CORRECT
ANSWER)velocity
A car accelerates at 2 m/s/s. Assuming the car starts from rest, how much time does
it need to accelerate to a speed of 20 m/s? - (CORRECT ANSWER)10 seconds
The unit of velocity is the meter. - (CORRECT ANSWER)False
Unless stated otherwise, when we discuss the speed of things, we mean with
respect to the surface of the Earth. - (CORRECT ANSWER)True
If you drop a feather and a bowling ball in a tube filled with air, which will reach the
bottom of the tube first? - (CORRECT ANSWER)bowling ball
Velocity is different from speed in that velocity is speed in a given direction. -
(CORRECT ANSWER)True
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's
average acceleration? - (CORRECT ANSWER)6 m/s ^2
Which of the following remains constant when an object is in free fall? - (CORRECT
ANSWER)acceleration
Consider the plot shown at the right. Which of the motions is consistent with the
graph?
Straight line in the positive area - (CORRECT ANSWER)The object is moving in the
positive direction with a constant speed and no acceleration.
A ball is thrown upwards and caught when it comes back down. Assuming the ball is
in free fall, the speed of the ball when caught would be - (CORRECT ANSWER)the
same as the speed it had when thrown upwards.
Which of the quantities are vector quantities? - (CORRECT ANSWER)displacement,
velocity, acceleration
It is possible to remain at a constant speed and still have a changing velocity. -
(CORRECT ANSWER)True
The acceleration due to gravity symbolized by the letter g has a value on Earth's
surface that is close to what value? - (CORRECT ANSWER)about 10 m/s/s down
, Consider the plot shown at the right. Which description below is consistent with the
graph?
Straight line then goes down - (CORRECT ANSWER)The object is at rest and then
moves in the negative direction at a constant speed.
Which one of the following characteristics is true of all accelerating objects? -
(CORRECT ANSWER)Accelerating objects are changing their velocity.
A ball is thrown straight up. At the top of its path its instantaneous speed is -
(CORRECT ANSWER)0 m/s
For which one of the following motions is the object's displacement different than the
distance traveled? - (CORRECT ANSWER)After a home run, a baseball player runs
all the way around the bases.
Acceleration is defined as the change in - (CORRECT ANSWER)velocity divided by
the time interval.
Distance and speed are scalar quantities. - (CORRECT ANSWER)True
A free falling object falls for 4 seconds. What distance did it travel? - (CORRECT
ANSWER)80 m
A train travels 6 meters in the first second of travel, 6 meters againd during the
second of travel, and 6 meters again during the third second. What is it's
acceleration? - (CORRECT ANSWER)0 m/s ^2
Speed is - (CORRECT ANSWER)- a measure of how fast something is moving.
- always measured in terms of a unit of distance divided by a unit of time.
- the distance covered per unit time
Suppose you take a trip that covers 180 km and takes 3 hours to make. Calculate
the average speed. - (CORRECT ANSWER)60 km/hr
A possible unit of speed is - (CORRECT ANSWER)miles per hour
light years per century
kilometers per hour
A ball is thrown straight up. At the top of its path, its acceleration is - (CORRECT
ANSWER)about 10 m/s/s down
Suppose a car is moving in a straight line and steadily increases its speed. It moves
from 35 km/hr to 40 km/hr the first second and from 40 km/hr to 45 km/hr the next
second. What is the cars acceleration? - (CORRECT ANSWER)5 km/hr/s
An object in free fall starts from rest. After falling for 6 seconds, it will have a speed
of approximately how much? - (CORRECT ANSWER)60 m/s
