Calculate Normal Force: 55 N Box on Table with 35 N Box and 28 N Hanging Box

[bloccubed]

You have a box that wieghs 55 N sitting on a table. On top of that box there is another box that weighs 35 N attached to a frictionless rope that is around a frictionless pully. At the other end of the rope there is another box that is hanging with a weight of 28 N. What is the normal force that the table exerts on the 55 N box?

 

[Jeff Ford]

Think 3rd law. It might help to draw this out.

 

[bloccubed]

what?

So what does that mean ? what is the force of the box that is hanging have to do with this and does that take additional force off of the 35 N box ?

 

[Jeff Ford]

How much force is exerted on the table? You've got the 55N box and the 35N box, but the 35N box is offset by the 28N box.