AP Physics 1 1.4.B: Motion Across Reference Frames

Practise describing motion from moving and stationary reference frames, using one-dimensional velocity addition or subtraction to compare what different observers measure.

Exam points

Calculate one-dimensional relative velocity by adding or subtracting object and observer velocities.
Compare object or centre-of-mass velocity between a moving frame and the stationary ground frame.

[Maximum number: 1]

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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1.4.B—Describe the motion of objects as measured by observers in different inertial reference frames question 1