A person is sitting on a bus that stops suddenly, causing her head to tilt forwa

Question

A person is sitting on a bus that stops suddenly, causing her head to tilt forward.

Part A

The bus will decelerate rapidly and her head continue forward at the same speed, so that it advances with respect to the bus. After the bus has stopped with respect to the ground, her head will appear to accelerate backward toward the rear of the bus to rejoin its headrest. Choose the point of view which the explanation of the acceleration of the head given above corresponds to.

Part B

Her head will accelerate forward as if pushed by a mysterious force as the bus stops and then accelerate backward to rejoin her headrest just after the bus has stopped. Choose the point of view which the explanation of the acceleration of the head given above corresponds to.

Part C

Which observer is in an inertial reference frame?

a. the point of view of another person on the bus b. the point of view of another person on the other bus that moves in the same direction c. the point of view of an observer on the ground d. the point of view of another person on the other bus that moves in the opposite direction

Explanation / Answer

Here ,

part A)

for this situation , this is as seen by the observer on the ground.

c.   the point of view of an observer on the ground

part b)

this is observed as the centrifugal force is acting on the observer ,

hence , the correct option is

b.   the point of view of another person on the bus

part c)

inertial frame of reference is one which is not accelerating.

d.   the observer on the ground

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