1.4 MC Answers and Review
6 min readβ’december 9, 2021
AP Physics 1Β π‘
257Β resourcesSee Units
Answers and Review for Multiple Choice Practice on Kinematics
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βSTOP β Before you look at the answers make sure you gave this practice quiz a try so you can assess your understanding of the concepts covered in Unit 1. Click here for the practice questions: AP Physics 1 Unit 1 Multiple Choice Questions.
Facts about the test: The AP Physics 1 exam has 50 multiple choice questions (45 single-select and 5 multiple-select) and you will be given 90 minutes to complete the section. That means it should take you around 15 minutes to complete 8 questions.
The following questions were not written by College Board and, although they cover information outlined in the AP Physics 1 Course and Exam Description, the formatting on the exam may be different.
1.Β A ball is dropped from a height of 5m. How long does it take to hit the ground?
A.Β 0.5s
B. 1s
C. 1.4s
D. 5s=o
Answer: Time to fall = sqrt(2H/g), where g = 10m/s/s
π Study AP Physics 1, Unit 1.2: Representations of Motion
2.Β A ball is dropped from a tabletop and falls to the ground below. At the same time another ball is rolled off the table with a horizontal speed of 5m/s. Which ball hits the ground first?
A. The dropped ball hits first
B. The rolled ball hits first
C. Both hit at the same time
D. It's impossible to know without more information
Answer: The time to fall depends only on the vertical motion which is the same for both balls. (Same vertical height, acceleration, and initial velocity)
3.Β The slope of a position vs time graph can be used to find:
A. The momentum of the object
B. The net force on the object
C. The acceleration of the object
D. The velocity of the object
Answer: Velocity is the change in position over time, so the slope of an x vs t graph is velocity
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
4.Β The slope of a velocity vs time graph can be used to find
A.Β The momentum of the object
B. The displacement of the object
C. The acceleration of the object
D. The velocity of the object
Answer: Acceleration is the change in velocity over time, so the slope (v/t) is the acceleration
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
5.Β The area of a velocity vs time graph can be used to find
A.Β The momentum of the object
B. The displacement of the object
C. The acceleration of the object
D. The velocity of the object
Answer:
The integral (area under the curve) of a velocity vs time graph is the displacement of the object
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
6. An object has a positive velocity, and a negative acceleration. What would the shape of a position vs time graph look like?
A.Β Concave downwards
B. Concave upwards
C. Linear, with a negative slope
D. Linear, with a positive slope
Answer: An acceleration will cause a position vs time graph to be curved. Negative accelerations create concave down graphs
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
7.Β An object has a positive velocity, and a negative acceleration. What would the shape of a velocity vs time graph look like?
A.Β Concave downwards
B. Concave upwards
C. Linear, with a negative slope
D. Linear, with a positive slope
Answer: An acceleration will cause a velocity vs time graph to be linear. Acceleration is the slope of a velocity vs time graph
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
8.Β A ball is thrown straight upwards with a velocity of 25m/s. What is the speed of the ball when it returns to its original height?
A. 10m/s
B. 25m/s
C. 50m/s
D. It depends on how high the ball travels
Answer: The vertical motion is symmetrical around the highest point. At any given height, the speed going up is equal to the speed going down at that same height.
π Study AP Physics 1, Unit 1.2: Representations of Motion
9.Β A linear position vs time graph means
A.Β The object is accelerating
B. The speed of the object is changing
C. The object is stopped.
D. The object has a constant velocity
Answer: Velocity is the change in position over time, so the slope of an x vs t graph is velocity
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
10.Β A horizontal position vs time graph means
A.Β The object is accelerating
B. The speed of the object is changing
C. The object is stopped.
D. The object has a constant velocity
Answer: With no change in position, the object can't be moving
π Study AP Physics 1, Unit 1.2: Representations of Motion
11.Β Two boxes are dropped from an airplane flying horizontally 1km above the ground. They are dropped 1s apart from each other. While they are both in the air, which of the following is correct?
A. The distance between the boxes increases
B. The distance between the boxes remains constant
C. The first box has a greater acceleration
D. The second box has a greater acceleration
Answer: The acceleration of both boxes are the same (g), but the first box will always be traveling 10m/s faster than the second one because it was dropped first. This means that each second the distance between the boxes is increasing
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
12.Β Between which points on the graph is the magnitude of the acceleration of the object the greatest?
A.Β AB
B. BC
C. CD
D. DE
Answer: The slope of the a velocity time graph is acceleration
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
13.Β How many times between A and F does the object change direction?
A.Β 0
B. 1
C. 2
D. 3
Answer: The object changes direction when the velocity goes from + to - or - to +. This only happens once around 9s
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
14.Β Describe the motion of the object between points D and E
A.Β Moving forwards at a constant speed
B. Moving backwards at a constant speed
C. Slowing down
D. Stopped
Answer: The velocity is negative (backwards) and constant between D and E
π Study AP Physics 1, Unit 1.1: Position, Velocity, and Acceleration
15.Β When the object reaches point F, where is it in relation to its starting position?
A.Β At the starting position
B. In front of it
C. Behind it
D. Can't be determined
Answer: The positive area under the curve is greater than the negative area under the curve so the total displacement of the object is positive (in front of the starting position)
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