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"

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"

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Expert Answer

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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