Where is the Least Net Force on a Roller Coaster Going Through a Vertical Loop?

[rcmango]

Homework Statement

A roller coaster goes through a vertical loop, the net force on the coaster is the least, where?

Homework Equations

The Attempt at a Solution

I said on the sides.

however it could be at the bottom, at the top, or the same all the way around.

i assumed not much force is affecting the sides.
any help please?

 

[cepheid]

So your strategy for solving the problem is guessing? How about applying some principles of physics instead? What do you know about circular motion? What forces are required to keep an object in circular motion? There's the answer to your question right there.

EDIT: As berkeman pointed out, this object is also under the influence of a gravitational field, and that factors in too.

 

[berkeman]

You're just guessing. Think about it more. Where do the people feel the least amount of weight? (the pressing of themselves into the seat)