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# Physics - Page 3

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Okay, so now I'm convinced it is the momentum of the club-head or swing speed that is important ( F = m v / t ).  But then, how can the club start motionless at address (zero net forces acting upon it), to something moving at say 90 miles per hour?  The club-head must accelerate in order for it to change speed, thus the players body must be applying force on the club in accordance to Newton's second law that force is directly proportional to the acceleration of an object ( F = m a ).

Since, dare I say, the club also comes to a stop at the top of the swing, even if briefly, a force must be applied, in the downswing, to the club with the player's hands, arms, shoulders, hips, etc.  In other words, the club must accelerate through the swing and hence how important maintaining one's grip is.

Agree?

Quote:
Originally Posted by Michael Lee

Okay, so now I'm convinced it is the momentum of the club-head or swing speed that is important ( F = m v / t ).  But then, how can the club start motionless at address (zero net forces acting upon it), to something moving at say 90 miles per hour?  The club-head must accelerate in order for it to change speed, thus the players body must be applying force on the club in accordance to Newton's second law that force is directly proportional to the acceleration of an object ( F = m a ).

Since, dare I say, the club also comes to a stop at the top of the swing, even if briefly, a force must be applied, in the downswing, to the club with the player's hands, arms, shoulders, hips, etc.  In other words, the club must accelerate through the swing and hence how important maintaining one's grip is.

Agree?

Easy...you move it. lol

It's been a while since I've been in physics, but your body does "work" on the backswing (in this case, torque multiplied by the angle I think), which in turn creates potential energy since you're hips and shoulders are rotated. Using that potential energy as well as gravity, the clubhead accelerates on the downswing and generates its speed.

Something like that.

Quote:
Originally Posted by Slice of Life

Easy...you move it. lol

Oh, how keen and clever you are :)  But think about Newton's first law, a body at rest will stay at rest unless acted upon by an outside force.  When I first heard this in high school, I thought "well duh"

Quote:
Originally Posted by Michael Lee

Oh, how keen and clever you are :)  But think about Newton's first law, a body at rest will stay at rest unless acted upon by an outside force.  When I first heard this in high school, I thought "well duh"

Like I said, move it. You're the outside force.

Quote:
Originally Posted by Michael Lee

The club-head must accelerate in order for it to change speed, thus the players body must be applying force on the club in accordance to Newton's second law that force is directly proportional to the acceleration of an object ( F = m a ).

Agree?

Read the posts before this in the thread, where I stated (or was quoted as saying) these same things (in longer form).

Geez.

Quote:
Originally Posted by iacas

Read the posts before this in the thread, where I stated (or was quoted as saying) these same things (in longer form).

Geez.

Okay, no problem.

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