stupid car and trailer questions

[Halil]

I have a physics sac tomorrow on motion and projectile motion.

I'm good with everything, except the stupid car and trailer questions.

I can do the hard stuff in motion but not this easy stupid thing.

Anyone can give some general help?
All the formulas that can or would possibly be needed to solve questions for it?

Anything will be appreciated.

[onur369]

Deborah

[pi]

Go over momentum, always handy

[Halil]

momentum is not part of the sac.
Im talking about the car that is towed to a trailer, and has friction acting on it, with their own separate masses, acceleration and driving force.

 

[pi]

momentum is not part of the sac.
Im talking about the car that is towed to a trailer, and has friction acting on it, with their own separate masses, acceleration and driving force.

 

My bad, and I only know how to do those questions the spesh way... (we do electronics first). Sorry, can't help there then.

[schnappy]

Whenever possible treat the car and trailer seperataly. Remember the tension is the driving force of the trailer. The tension is the (non-air resistance) force holding the car back.

[Hodgeyhodgey]

Just remember little things like; constant velocity means thrust = air resistance/friction, constant acceleration formulas (v=u+at, x=ut+1/2at^2, etc) and what I struggled with most, tension in the bar between the trailer and car (which apparently is quite simple, use f=ma on the trailer..)