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Another teaser that I have been attempting is the following:

A Locomotive (A) pulls two tracks (B) and (C). The masses of A,B & C are 80, 25 and 20 tonne respectively. The train starts from rest and accelerates uniformally to cover 2KM in 8 minutes. Assume the resistance to motion of the locomotive and the trucks is 200N/tonne

1. Calculate the tractive effort developed by the locomotive A.

I have used the formula: Tractive Effort = Total resistance to motion (R) + Mass x Acceleration.

The total resistance to motion is 200/N tonne x (80+25+20) = 25KN

The mass is 125 Tonne

The acceleration I have as 0.01736111 m/s using s=ut+1/2at^2.

Therefore I have the tractive effort as 27.17K Newtons.

Is this right???

2. Calculate the draw-bar pull between A and B

3. Calculate the draw bar pull between B & C

I am struggling with 2 and 3. Could anyone give me any pointers??

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# Homework Help: Locomotive question!

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