harrybo6
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A van of mass 5200kg pulls a trailer of mass 1200kg on a straight horizontal road. The driving force of the van's engine is 4800N. Horizontal resisting forves of 600N and 200N act of the van and trailer respectively. Find:
a) Acceleration on the van and trailer.
b) The tension in the coupling between the van and trailer.


What i did for part a) made one for the van 4200-600-T=5200a
Then made of the the trailer T-200=1200a
made simultaneous equations
which got me: 3400=6400a
then i got a as 0.53ms^-2
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Zacken
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(Original post by harrybo6)
A van of mass 5200kg pulls a trailer of mass 1200kg on a straight horizontal road. The driving force of the van's engine is 4800N. Horizontal resisting forves of 600N and 200N act of the van and trailer respectively. Find:
a) Acceleration on the van and trailer.
b) The tension in the coupling between the van and trailer.


What i did for part a) made one for the van 4200-600-T=5200a
Then made of the the trailer T-200=1200a
made simultaneous equations
which got me: 3400=6400a
then i got a as 0.53ms^-2
Consider the trailer and van as one particle.

So draw a box with mass 5200 + 1200 \, \mathrm{kg} and a forward force of 4800 \, \mathrm{N} and a backward force of 600 + 200 \, \mathrm{N} and then resolve in the forward direction to get 4800 - (600+200) = (5200 + 1200)\cdot a then solve for a.
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Zacken
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(Original post by harrybo6)
A van of mass 5200kg pulls a trailer of mass 1200kg on a straight horizontal road. The driving force of the van's engine is 4800N. Horizontal resisting forves of 600N and 200N act of the van and trailer respectively. Find:
a) Acceleration on the van and trailer.
b) The tension in the coupling between the van and trailer.


What i did for part a) made one for the van 4200-600-T=5200a
Then made of the the trailer T-200=1200a
made simultaneous equations
which got me: 3400=6400a
then i got a as 0.53ms^-2
You'd be better off posting in the maths forum: http://www.thestudentroom.co.uk/forumdisplay.php?f=38 in the future .
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