Discussion
Which of the following observations are inertial?
Answer: B
An inertial observer is one moving at constant velocity, so a driver in a car moving with constant velocity is inertial, option B.
A slowing train, an aircraft taking off and a child revolving in a merry-go-round are all accelerating, so they are non-inertial.
Newton's first law holds in inertial frames, which are frames at rest or in uniform motion in a straight line. A car moving at constant velocity is such a frame. A braking train, a climbing aircraft and a merry-go-round are all accelerating frames, in which a free body appears to accelerate for no reason.
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