# The Naked Scientists Forum

### Author Topic: What will be easier to throw, when the ball has a same mass?  (Read 3623 times)

#### Seany

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##### What will be easier to throw, when the ball has a same mass?
« on: 06/07/2007 10:20:48 »
Hmm... Let's say.. There is no air resistance! OK?

And we have two balls. One is the size of a marble. One is the size of a globe.

(Theoretically. I'm not sure if it's possible to compress a marble so much so that it weighs 10kg..)

If I was to throw both balls.. What would go further??

#### dentstudent

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##### What will be easier to throw, when the ball has a same mass?
« Reply #1 on: 06/07/2007 10:40:03 »
The joke for this one is too obvious!

#### dentstudent

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##### What will be easier to throw, when the ball has a same mass?
« Reply #2 on: 06/07/2007 10:42:22 »

(Theoretically. I'm not sure if it's possible to compress a marble so much so that it weighs 10kg..)

Black holes can be much smaller, and MUCH heavier!

#### DoctorBeaver

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##### What will be easier to throw, when the ball has a same mass?
« Reply #3 on: 06/07/2007 10:47:00 »

(Theoretically. I'm not sure if it's possible to compress a marble so much so that it weighs 10kg..)

Black holes can be much smaller, and MUCH heavier!

Wouldn't it be fun to stick a micro blackhole on the table at the world snooker final

(OK, I know the table would probably be gobbled up too, but allow me poetic licence)

#### Seany

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##### What will be easier to throw, when the ball has a same mass?
« Reply #4 on: 06/07/2007 11:04:22 »

(Theoretically. I'm not sure if it's possible to compress a marble so much so that it weighs 10kg..)

Black holes can be much smaller, and MUCH heavier!

Yes I know.. but for us to create.. We probably could.. But not something such as 100kg in the size of a marble

#### Soul Surfer

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##### What will be easier to throw, when the ball has a same mass?
« Reply #5 on: 06/07/2007 11:07:32 »
It is the mass that determines how "hard" it is to throw (or push) an object at a given speed so if two objects have the same mass they are similarly difficult but that does not take into account the physical attributes of a human being and the effect of gravity because a very small very dense object could injure you by the large localised pressure it would cause on your body.

#### Seany

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##### What will be easier to throw, when the ball has a same mass?
« Reply #6 on: 06/07/2007 11:19:38 »

#### lightarrow

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##### What will be easier to throw, when the ball has a same mass?
« Reply #7 on: 06/07/2007 13:41:14 »
Hmm... Let's say.. There is no air resistance! OK?

And we have two balls. One is the size of a marble. One is the size of a globe.

(Theoretically. I'm not sure if it's possible to compress a marble so much so that it weighs 10kg..)

If I was to throw both balls.. What would go further??
With no air resistance the globe would go farther, because the "rolling friction" (I hope to have translated correctly into english) is less, since it's approximately proportional to the wheel's curvature (=1/r).
« Last Edit: 06/07/2007 13:43:32 by lightarrow »

#### Seany

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##### What will be easier to throw, when the ball has a same mass?
« Reply #8 on: 06/07/2007 13:44:38 »
I meant just the flight and where it lands.

#### another_someone

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##### What will be easier to throw, when the ball has a same mass?
« Reply #9 on: 06/07/2007 13:45:30 »
Also, you will throw the ball furthest if the line of force you apply goes straight through the centre of mass.  For a very large object, it may be difficult to achieve this precisely, so it is possible that some of the force you apply might be expended in giving the object spin rather than in applying forward velocity.

#### Seany

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##### What will be easier to throw, when the ball has a same mass?
« Reply #10 on: 06/07/2007 13:46:36 »
Oh.. But if it's a small object, it is easier to go straight rather than spin?

#### The Naked Scientists Forum

##### What will be easier to throw, when the ball has a same mass?
« Reply #10 on: 06/07/2007 13:46:36 »