Help me in understanding and solving

  • Thread starter naada
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In summary, a child is exerting a horizontal force of 10N to pull a train of 2 cars, with car 1 having a mass of 3kg and car 2 having a mass of 1kg. The mass of the string connecting the cars is negligible and friction can be ignored. The normal force exerted on each car by the floor is equal to its weight, and can be found using the equation N = mg + ma. The tension force in the string can be found using the equation F = mg, and the acceleration of the train can be found by solving for a in the equation -T = -mg + ma.
  • #1
naada
4
0

A child pulls a train of 2 cars with a horizontal force F of 10N .
Car1 has a mass of m1=3kg, and car2 has a mass of 1kg
The mass of the string connecting the the cars is small enough to be set equal to zero, and the friction can be neglected .


a- Find the normal force exerted on each car by the floor.
b- What is the tension force in the string
c- Find the acceleration of the train




thanx



well please help me to solve and understand this problem
I can't figure out why the normal force in this problem is equal to the weight or how to find the acceleration.! b]
 
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  • #2
This is the way i did it

a- Car 1
N-F= ma
N - mg = ma
N= mg+ma
N= 3*9.8 + 3*9.8 = 29.4 + 29.4 =58.8

Car 2
The same way so its N =19.6

b- F-T = m a
F= mg= 3+1 * 9.8 = 39.2
so
39.2 - T = 1+3 * a
-T = -39.2 +4*a
a=?
I COULDN'T FIGURE OUT HOW TO FIND THE ACCELERATION.!

PLZ PLZ PLZ HELP ME UNDERSTANT THIS PROBLEM
I'VE AN EXAM IN 2 DAYS ANT I CAN'T UNDERSTAND A WORD OF THIS SUBJECT
 
  • #3
goto this page
100% correct
http://knowhowstuff.blogspot.com/2009/05/physics-forum-answers.html"
 
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