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joshi
Group Title
A train consists of a caboose (mass = 1000 kg), a car (mass 2000 kg), and an engine car (mass 2000 kg). If the train has an acceleration of 5 m/s2, then the tension force in the coupling between the middle car and the engine car is
25,000 N
20,000 N
15,000 N
10,000 N
 2 years ago
 2 years ago
joshi Group Title
A train consists of a caboose (mass = 1000 kg), a car (mass 2000 kg), and an engine car (mass 2000 kg). If the train has an acceleration of 5 m/s2, then the tension force in the coupling between the middle car and the engine car is 25,000 N 20,000 N 15,000 N 10,000 N
 2 years ago
 2 years ago

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ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
This tension must be enough to pull both cars behind the engine car, but not the engine car, at an aceleration of 5m/s^2. Remember that F=ma
 2 years ago

joshi Group TitleBest ResponseYou've already chosen the best response.0
@ivanmlerner still pretty confused. i've calculated the total force and the seperate forces as well but i'm not getting the correct answer.
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
No, you dont consider the engine car, because the tension is pulling only the last two. Probably thats what your getting wrong.
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
Ok, the mass is 3000, because you dont consider the engine car, then 3000*5=F=15000N
 2 years ago

ksaimouli Group TitleBest ResponseYou've already chosen the best response.0
why should we not consider that
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
dw:1350081459057:dw The last car needs to have the same acelerationa s the others, so you need less force to pull it, the second car needs to pull the last and be pulled, so it is the force for pulling the last plus the force of pulling the second, and so on
 2 years ago

joshi Group TitleBest ResponseYou've already chosen the best response.0
ohhhh i think i get it now. thanks!
 2 years ago
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