# The Naked Scientists Forum

### Author Topic: In Bowls, if different size or weights of bowl are thrown with the same force will they stop at the same distance?  (Read 624 times)

#### thedoc

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##### In Bowls, if different size or weights of bowl are thrown with the same force will they stop at the same distance?
« on: 13/05/2016 04:50:02 »
Henry Duncan asked the Naked Scientists:
A lawn bowls question. Bowls come in different sizes and weights The debate is : if the same force (delivering the bowl) is applied will the different size bowls end up at the same distance from point of delivery? What about balls of a different material eg a marble or tennis ball or a ping pong ball? Henry Duncan
What do you think?
« Last Edit: 13/05/2016 04:50:02 by _system »

#### RD

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##### Re: In Bowls, if different size or weights of bowl are thrown with the same force will they stop at
« Reply #1 on: 13/05/2016 05:54:22 »
Thrown with "same force" and leaving the bowler's hand at the "same speed" are not equivalent. More muscle force will be required to make a heavier bowl leave the hand at the same speed as a lighter one.
At the same speed the heavier bowl will have more kinetic energy.

Once thrown, rolling friction & air friction will slow the bowl down.
If the goal is maximum-distance for rolling a solid ball of a specified diameter, on a given surface, with the same initial speed , there will be an optimum density for the material the ball is made from.

If the surface cannot be deformed, like a hard road , the denser the ball better ...