Force on cart

• Jun 19th 2009, 02:39 AM
Twig
Force on cart
Hi

Description in the attached picture.

How can the ramp exert a force larger than the weight of the person !! (?)

Also, I am not sure how to interpret the $\beta$ angle.
• Jun 22nd 2009, 06:47 AM
earboth
Quote:

Originally Posted by Twig
Hi

Description in the attached picture.

How can the ramp exert a force larger than the weight of the person !! (?)

Also, I am not sure how to interpret the $\beta$ angle.

Since $\beta > \theta$ the body of the person is dragged down a little bit which explains why the force acting on the ramp is greater than the weight of the person.
• Jun 22nd 2009, 08:58 AM
Twig
Hi

I dont get it.

I interpret $\beta$ as the wire pointing 3 degrees above horizontal where his hands pull.

I did: Free-body diagram of cart

$R - mg cos(\theta) = 0$

$T - mg sin(\theta) = 0$

It doesnt work.

Thx
• Jun 22nd 2009, 09:30 AM
Twig
Problem solved.