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AP Physics 1 1.4 Reference Frames & Relative Motion

Practise AP Physics 1 1.4 questions by adding velocity vectors, comparing observers and identifying what remains unchanged between inertial frames.

Syllabus
Effective Fall 2025
Course
AP Physics 1: Algebra-Based

Exam points

  • identify the governing concept or relationship in the problem
  • justify the result with equations, diagrams or contextual evidence

Covered syllabus points

1.4.B—Describe the motion of objects as measured by observers in different inertial reference frames1.4.A—Describe the reference frame of a given observer

1.4 Reference Frames and Relative Motion question 1

[Maximum number: 1]

Two cars approach an intersection at right angles, as pictured above. What is their relative speed to each other?

A

10 mph

B

45 mph

C

57 mph

D

80 mph

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