Your old toy train from pre-school days consists of three cars:M 1 = 0.3 kg, M 2

Question

Your old toy train from pre-school days consists of three cars:M1 = 0.3 kg, M2 = 0.3 kg, andM3 = 0.3 kg. You pull the cars with a force F = 2.0N.

If friction can be neglected, what is the difference in thetensions between the two ropes, FA -FB?

Give your answer in Newtons to three significant digits.

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Your old toy train from pre-school days consists of three cars:M1 = 0.1 kg, M2 = 0.2 kg, andM3 = 0.4 kg. You pull the cars with a force F = 3.5N. The coefficient of kinetic friction between the cars and theground is k = 0.10.

hat is the difference in the tensions between the two ropes,FA - FB?

Give your answer in Newtons to three significant digits.

Explanation / Answer

FA = F N and FB = FA = F (b) If friction acts    FA = F - (M1 + M2 + M3) g and    FB = FA - ( M2 + M3 )g the difference     FA - FB = F - ( M1 + M2 + M3) g - FA + (M2 + M3) g                   =F - FA - M1 g Plug the values and solve it

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