TWO PART QUESTION: Part A: What can be said about reference frames in the sketch

Question

TWO PART QUESTION:

Part A: What can be said about reference frames in the sketch if car is moving with 15 m/s with respect to Bill?

A) Amy, Bill and Car passenger have same reference frame.

B) Amy, Bill and Car passenger have different reference frame.

C) Bill and Car passenger have same reference frame?

D) Bill and Amy have same reference frame.

Part B: What is the speed of a car relative to amy if the car is moving 15 m/s relative to Bill?

A) 10 m/s        B) 15 m/s           C) 20 m/s         D) none

**please show work**

Explanation / Answer

PART A

Amy, Bill and car all three have different velocities. For reference frames to be same, the velocities must be same. If velocities are different, the reference frames are also different.

Thus all three of them have different reference frames.

Correct option is (B)

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PART B

As Amy is at rest, her reference frame is same as ground.'

Using relative speeds principle,

Speed of car relative to Bill = (Speed of car relative to Amy) - (Speed of Bill relative to ground)

Thus

15 = Speed of car relative to Amy - 5

Thus speed of car relative to Amy = 20 m/s

Correct option is (C)

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