A car of mass 800kg is pulling a caravan of mass 100kg along a straight horizontal road. Caravan is connected to car by a light, rigid tow bar. Car is exerting a driving force of 1270N. The resistance to the forward motion of the car and caravan are 400N and 600N respectively; you may assume that these resistances remain constant.

i) Show that acceleration of the car and caravn is 0.15 done this part

ii) Draw a diagram showing all forces acting on caravn along the line of its motion. calculate the tension in the towbar. Done this part tension is 750N.

The driving force is removed but the car's brakes are not applies.

iii)Determine whether the tow bar is now in tension or compression??

No idea how to determine this but i think its in tension but u have to calulate the value too. Answer in book tension 44N any help on how they got to this well appreiciated

i) Show that acceleration of the car and caravn is 0.15 done this part

ii) Draw a diagram showing all forces acting on caravn along the line of its motion. calculate the tension in the towbar. Done this part tension is 750N.

The driving force is removed but the car's brakes are not applies.

iii)Determine whether the tow bar is now in tension or compression??

No idea how to determine this but i think its in tension but u have to calulate the value too. Answer in book tension 44N any help on how they got to this well appreiciated

The idea here is that you need to work out which os slowing down faster (doesn't really make sense, but you know what I mean). If the caravan is slowing down, in relation to the car, then the car is pulling it, and the towbar would be in tension. Then you would need to calculate the force the towbar (and so the car) would have to apply to the caravan in order to keep the two maving at the same speed.

Post your working. We can't help you unless we know what you're doing.

Sorry, I have no idea where you've got that line from...?

hi sorry forget that working i knew it was completely wrong but lets try and strt a fesh so is this diagram correct it shows all the resistive forces and am i right in thinking acceleration is 0 and it is moving at a constant speed or is the whole system slowing down?

ive only shown the horizontal forces not the vertical forces as they will cancel each other out

ive only shown the horizontal forces not the vertical forces as they will cancel each other out

sorry heres the attachment should i take the force T off as the Q asks to determine whether towbar is in compression or tension so we dont know which direction the force T is acting?

amh189

sorry heres the attachment should i take the force T off as the Q asks to determine whether towbar is in compression or tension so we dont know which direction the force T is acting?

Ugh. You've given us three different masses for the caravan now, please get the question right.

Original post by amh189

still cant get 44N i got 18640N?? does anyone know how to get 44N diagram would help if possible

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