AP Physics 1 | Unit 1 Progress Check Questions and Answers with
100% Correct Answers | Latest Version
Question 1.
Rock X is released from rest at the top of a cliff that is on Earth. A short time later, Rock Y
is released from rest from the same location as Rock X. Both rocks fall for several seconds
before landing on the ground directly below the cliff. Frictional forces are considered to be
negligible. Which of the following graphs correctly shows the vertical velocity of rock X as
a function of time? Take the positive direction to be upward.
Correct Answer: Velocity | \ | \ | \ | \ |________\___________- Time
Question 2.
Rock XX is released from rest at the top of a cliff that is on Earth. A short time later, Rock
YY is released from rest from the same location as Rock XX. Both rocks fall for several
seconds before landing on the ground directly below the cliff. Frictional forces are
considered to be negligible. Which of the following graphs best represents the vertical
displacement of Rock XX as a function of time starting from immediately after the rock is
released from rest? Take the positive direction to be downward.
Correct Answer: Vertical Displacement |--|) |) |) |__________\______________ Time
Question 3.
Rock XX is released from rest at the top of a cliff that is on Earth. A short time later, Rock
YY is released from rest from the same location as Rock XX. Both rocks fall for several
seconds before landing on the ground directly below the cliff. Frictional forces are
considered to be negligible. After Rock YY is released from rest several seconds after Rock
XX is released from rest, what happens to
Correct Answer: S increases because at all times Rock X falls with a greater
speed than Rock Y
Question 4.
Toy car WW travels across a horizontal surface with an acceleration of aw after starting
from rest. Toy car ZZ travels across the same surface toward car WW with an acceleration
of az after starting from rest. Car WW is separated from car ZZ by a distance d. Which of
the following pairs of equations could be used to determine the location on the horizontal
surface where the two cars will meet, and why?
Correct Answer: x=x0+v0xt+12axt2for car W, and x=x0+v0xt+12axt2 for car Z.
Since the cars will meet at the same time, solving for t in one equation and
placing the new expression for t into the other equation will eliminate all
unknown variables except x
Question 5.
A ball traveling at a speed ν0 rolls off a desk and lands at a horizontal distance x0 away
from the desk, as shown in the figure. The ball is then rolled off of the same desk at a
speed of 3 v03. At what horizontal distance will the ball land from the table?
100% Correct Answers | Latest Version
Question 1.
Rock X is released from rest at the top of a cliff that is on Earth. A short time later, Rock Y
is released from rest from the same location as Rock X. Both rocks fall for several seconds
before landing on the ground directly below the cliff. Frictional forces are considered to be
negligible. Which of the following graphs correctly shows the vertical velocity of rock X as
a function of time? Take the positive direction to be upward.
Correct Answer: Velocity | \ | \ | \ | \ |________\___________- Time
Question 2.
Rock XX is released from rest at the top of a cliff that is on Earth. A short time later, Rock
YY is released from rest from the same location as Rock XX. Both rocks fall for several
seconds before landing on the ground directly below the cliff. Frictional forces are
considered to be negligible. Which of the following graphs best represents the vertical
displacement of Rock XX as a function of time starting from immediately after the rock is
released from rest? Take the positive direction to be downward.
Correct Answer: Vertical Displacement |--|) |) |) |__________\______________ Time
Question 3.
Rock XX is released from rest at the top of a cliff that is on Earth. A short time later, Rock
YY is released from rest from the same location as Rock XX. Both rocks fall for several
seconds before landing on the ground directly below the cliff. Frictional forces are
considered to be negligible. After Rock YY is released from rest several seconds after Rock
XX is released from rest, what happens to
Correct Answer: S increases because at all times Rock X falls with a greater
speed than Rock Y
Question 4.
Toy car WW travels across a horizontal surface with an acceleration of aw after starting
from rest. Toy car ZZ travels across the same surface toward car WW with an acceleration
of az after starting from rest. Car WW is separated from car ZZ by a distance d. Which of
the following pairs of equations could be used to determine the location on the horizontal
surface where the two cars will meet, and why?
Correct Answer: x=x0+v0xt+12axt2for car W, and x=x0+v0xt+12axt2 for car Z.
Since the cars will meet at the same time, solving for t in one equation and
placing the new expression for t into the other equation will eliminate all
unknown variables except x
Question 5.
A ball traveling at a speed ν0 rolls off a desk and lands at a horizontal distance x0 away
from the desk, as shown in the figure. The ball is then rolled off of the same desk at a
speed of 3 v03. At what horizontal distance will the ball land from the table?
