MC: An inertial frame of reference is:?

An inertial frame of reference is:





a)In a simplified model, a reference frame which could be attached to the earth.





b) Unique, i.e., there only can be one inertial frame of reference.





c) A frame of reference in which Newton’s First Law is not valid.

MC: An inertial frame of reference is:?
An inertial frame of reference is: a reference frame Newton's laws of motion are valid. It is a reference frame which is either at rest or is moving with constant velocity.





Newton's laws are valid in a lab on earth hence earth is assumed ( for experiments done on earth) to be an inertial frame of reference .





In a simplified model, a reference frame which could be attached to the earth is inertial reference plane:





Hence (a) is the correct answer

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