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βοΈFree Response Questions (FRQs)

3 min readβ’december 22, 2021

π Welcome to theΒ **AP Physics Unit 1 FRQ (Kinematics) Answers**.Β Have your responses handy as you go through the rubrics to see how you did!

β± Remember, the AP Physics 1 exam has 5 free-response questions, and you will be given 90 minutes to complete the FRQ section. (This means you should **give yourself ~18 minutes** to go through each practice FRQ.)

- 3.A.1.1 Express the motion of an object using narrative, mathematical, and graphical representations. [SP 1.5, 2.1, 2.2]
- 4.A.2.1 Make predictions about the motion of a system based on the fact that acceleration is equal to the change in velocity per unit time, and velocity is equal to the change in position per unit time. [SP 6.4]
- 4.A.2.3 Create mathematical models and analyze graphical relationships for acceleration, velocity, and position of the center of mass of a system and use them to calculate properties of the motion of the center of mass of a system. [SP 1.4, 2.2]

A student of mass *m* stands on a platform scale in an elevator in a tall building. The positive direction for all vector quantities is upward. The vertical position of an elevator as a function of time is shown below. The velocity at 6 seconds is -30 m/s.

(a) On the grid below, **plot** the velocity of the elevator as a function of time. (3pts)

- 1pt: For a horizontal line at 20 m/s from t=0 to t=2
- 1pt: For a straight line starting at 20 m/s at t=2, and ending at 0 m/s at t=4
- 1pt: For a straight line starting at 0 m/s at t=4, and ending at -30 m/s at t=6

- Replay: Velocity vs. Time Graphs

(b) **Calculate** the average acceleration for the time period *t *= 2s to *t* = 4s. (3pts)

- 1pt: For a description or equation for acceleration either as the slope of the
*v*vs.*t*graph, or a = βv / βt - 1pt: For the work to determine the acceleration, a = (0-20) / (4-2)
- 1pt: For the correct answer with units, a = -10 m/s^2

- Study Guide: Position, Velocity, and Acceleration

An inspector provides the student with the following graph showing the acceleration *a* of the elevator as a function of time *t*.

(c) During what time interval(s) is the speed of the elevator constant? How do you know? (3pts)

- 1pt: For the time interval of 10-13 sec
- 1pt: For the time interval of 19-20 sec
- 1pt: For a correct explanation that for a constant velocity, the acceleration of the system must be equal to 0

- Replay: Acceleration

- π§ Want to continue reinforcing your knowledge of Unit 1? Check out Unit 1 Trivia, either as a document or as a game.

- β Ready to move on to the next topic? Take a look at the collection of Unit 2 resources.

- π Want to review multiple units? Check out all of the AP Physics FRQs.

- π€ Got more questions? Want to help others studying the same topic? Jump into a room inΒ Hours!

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βοΈFree Response Questions (FRQs)

Unit 1 FRQ (Kinematics)

- AP Physics 1 Free Response Question for Kinematics
- Learning Objectives & Science Practices
- Reference Video
- Setup
- Questions with Answers & Rubric
- Next Steps
- AP Physics 1 Free Response Question for Kinematics
- Learning Objectives and Science Practices
- Reference Video
- Setup
- Questions
- Setup
- Questions
- Answers & Rubric

π§Multiple Choice Questions (MCQs)

πUnit 10: Mechanical Waves & Sound

πUnit 1: Kinematics

πUnit 2: Dynamics

πUnit 3: Circular Motion

β‘οΈUnit 4: Energy

β³οΈUnit 5: Momentum

πΈUnit 6: Simple Harmonic Motion

π‘Unit 7: Torque & Rotational Motion

π‘Unit 8: Electric Charges & Electric Force

πUnit 9: DC Circuits

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