AP Physics 1: Algebra-Based 1.4 Reference Frames and Relative Motion Questions

Practise AP Physics 1 1.4 by converting one-dimensional velocities between moving and ground frames and comparing what different inertial observers measure.

Exam points

combine object and observer velocities to calculate one-dimensional relative motion
compare object or centre-of-mass velocity between a moving frame and the stationary ground frame

Covered syllabus points

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

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Figure for Question 1 — AP Physics 1: Algebra-Based

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

10 mph

45 mph

57 mph

80 mph

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Covered syllabus points

Question 1