Finding the acceleration of an object

1. The problem statement, all variables and given/known data
In the picture:
http://ift.tt/NgW0t4
There is a force (F) pushing the car to the right
The car’s mass is M
There are two other objects with masses m1 and m2 that are connected by a cord with no mass.
There is no friction
In terms of m1, m2 and M find the acceleration needed to keep m1 and m2 from falling down.

2. Relevant equations

This is the second Newton’s law.
The only equation I use is

Fnet=m*a

3. The attempt at a solution

I have tried doing this by placing the 3 m’s (m1, m2 and M) in their respective Cartesian planes to get the forces of each one, but the part I don’t quite understand is which forces I have to put in the formula…
I understand that I need to add the masses:
Fnet=(M+m1+m2)*a
and I understand that Fnet consists of the F force that is affecting the car, but what other?
Do I need to use the tension of the cord that holds m1 and m2 together? or all I do is:
F=(M+m1+m2)*a
So the acceleration would be
F/(M+m1+m2)=a ?

http://ift.tt/NgW0Ji

Leave a comment

Your email address will not be published.


*


Show Buttons
Hide Buttons