1. A model train consists of five cars and the engine; the cars are numbered in

Question

1. A model train consists of five cars and the engine; the cars are numbered in order beginning with #1 next to the engine. Each car has a mass of 1.5 kg, and the model has been accelerating southward on level track, led by the engine unit, at 2.3 m/s2 since it started from rest 2.0 s ago. Identify, in a neat table, all the forces on (and only those on) car 2.

2. In problem 1, find the force that will be exerted by car #3 on car #2 if friction on the cars by the track is negligible. Indicate your reasoning.

Explanation / Answer

1. on car2   

Normal force N1 = 4 x 1.5 x 2.3 = 13.8 N southward

NOrmal force N2 = 13.8 - 1.5 x 2.3 = 10.35 N northward

garvitational force = mg = 14.7 N downwards

normal force = 14.7 upwards

2. by car 3 on car 2 = N2 = 10.35 N

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