Question

Asked Nov 6, 2019

a) i) Distinguish between inertial and non-inertial frames of reference.

Outline a method that you can use to enable you to distinguish them.

ii) Assess the reliability of the results you obtained in the first-hand investigation outlined in part (i)

b) Comment on the statement "a theory is useless unless it has supporting evidence"

Step 1

a)

i)

Inertial frames are ones which are at rest or moving with uniform velocity with respect to fixed stars.

For an observer in such a frame of reference Newton's second law of motion is valid.

Ex: A train moving with uniform velocity is an inertial frame.

Step 2

A non-inertial frame is one which is accelerated (linearly or due to rotation) with respect to fixed stars.

Newton's second law of motion is not valid in such a frame of reference, unless we introduce a force called pseudo - force.

Ex: A freely falling elevator may be taken as a non-inertial frame.

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