A toy train accelerates with a constant acceleration of 1.0 meter per second squared. Thetrain consists of an engine with a mass of 450. grams pulling a box car with a mass of 75.0 grams and a caboose at the end with a mass of 55.0 grams. What force does the engine exert on the box car? What force does the box car exert on the engine? What force does the box car exert on the caboose? What force does the caboose exert on the box car? For the purposes of this question you may ignore the force of friction though of course, the train would have a mighty hard time accelerating without being able to exert a frictional force on the track.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!