Calculating Angular Velocity at the Midpoint of a Bar

[teng125]

does anybody knows how to find the angular velocity of the midpoint of a bar??

pls help...

 

[civil_dude]

I think you're going to have to provide additional information...

 

[teng125]

no,let say the angular velocity of a bar is given but what is the angular velocity of the midpoint of the bar itself

 

[andrewchang]

i would say that the midpoint has the same angular velocity.

 

[durt]

A single point can't have angular velocity about itself, can it? (assuming the "midpoint" is also the pivot point)

 

[civil_dude]

I do believe that for a rigid body, the angulare velocity is the same for all points on the body.

 

[durt]

But the center point is not moving, so it has no angular velocity. I guess it doen't really matter since the point has no mass.

 

[civil_dude]

I think that the axis, which runs through the point of rotation, will be rotating, although since r = o, it will have no tangential velocity.

 

[andrewchang]

actually, the center point is moving. it just happens to be spinning in the same place.

 

[zthavan]

the centre point moves

 

[durt]

A point can't "spin." A very, very small object can, but not a point.

 

[andrewchang]

A point can't "spin." A very, very small object can, but not a point.

http://hyperphysics.phy-astr.gsu.edu/hbase/rotq.html#avel

http://kr.cs.ait.ac.th/~radok/physics/b6.htm

http://www.sparknotes.com/physics/rotationalmotion/rotationalkinetics/section1.html

 

[fargoth]

this is a stupid argument

i thought id enter it, but... nah...

 

[andrewchang]

i agree... i think i'll stop now.