2

# In a simple pendulum, the centripetal force stem from the object's own mass, right?

Tue 25 Sep, 2012 12:19 pm
As in the link below, mgsinθ=Fcentripetal. So this centripetal force is NOT an extra force, it stems from the round object's own mass right?

http://www.pinkmonkey.com/studyguides/subjects/physics/chap7/image10.gif

Yes or no question. If no, where does it stem from?
• Topic Stats
• Top Replies
Type: Question • Score: 2 • Views: 2,816 • Replies: 4
No top replies

1
Tue 25 Sep, 2012 12:37 pm
@cicibebe,
No, it is not centripetal force at all.

mg is the force exerted by gravity.

mgsinθ and mgcosθ simply break up mg into component forces. One force is in the same direction as the string, and the other is perpendicular to the string.

The centripetal force in the diagram is τ.
0 Replies

dalehileman

0
Tue 25 Sep, 2012 01:49 pm
@cicibebe,
Quote:
So this centripetal force is NOT an extra force,
Cici shouldn't that be "centrifugal"

1
Tue 25 Sep, 2012 01:51 pm
@dalehileman,
Centripetal is the force acting to keep the body on a curve.

"to seek the center"

Quote:
Centrifugal force (from Latin centrum, meaning "center", and fugere, meaning "to flee") is the apparent outward force that draws a rotating body away from the center of rotation. It is caused by the inertia of the body as the body's path is continually redirected. In Newtonian mechanics, the term centrifugal force is used to refer to one of two distinct concepts: an inertial force (also called a "fictitious" force) observed in a non-inertial reference frame, and a reaction force corresponding to a centripetal force.
dalehileman

0
Wed 26 Sep, 2012 09:25 am
Thanks Dad for the def and yes, that's how I understand "centrifugal". But clearly I don't understand the OP since I can't see with the swing of a pendulum how there's any centripetal force, that is, directed at the pivot
0 Replies

### Related Topics

New Propulsion, the "EM Drive" - Question by TomTomBinks
The Science Thread - Discussion by Wilso
Why do people deny evolution? - Question by JimmyJ
Are we alone in the universe? - Discussion by Jpsy
Fake Science Journals - Discussion by rosborne979
Controvertial "Proof" of Multiverse! - Discussion by littlek

1. Forums
2. » In a simple pendulum, the centripetal force stem from the object's own mass, right?