Question

In which of the following scenarios would Newton's laws of motion apply without needing to introduce pseudo-forces?

Options

• A person on a spinning merry-go-round

• A satellite orbiting the earth at a constant speed

• A train moving at a constant velocity on a straight track

• A car that is braking to a stop

Answer 1

A train moving at a constant velocity on a straight track

Explanation:

A constant velocity means there is no acceleration, which defines an inertial frame where Newton's laws hold true.