10-04-2012, 10:24 AM
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#21 | |
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Registered Abuser
Join Date: Sep 2007
Location: Calgary, Canada
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Quote:
Your answer did not need to be this long.
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10-04-2012, 10:25 AM
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#22 | |
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UG Addict
Join Date: Apr 2010
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Quote:
isn't acceleration a vector quantity aswell?
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10-04-2012, 10:26 AM
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#23 | |||
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UG's Apprentice Physicist
Join Date: Dec 2006
Location: Somewhere In Scotland
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Yup.
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10-04-2012, 10:28 AM
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#24 | |
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UG's Foo Foo Cuddly Poops
Join Date: Jan 2009
Location: ---- Lake Bodom ---- Join Date: May 2001
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Yes, but in this model where a ball is thrown up, the acceleration is due to the force of gravity, which is assumed to be constant and always negative (as the ball is always attacted back to the ground)
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10-04-2012, 10:40 AM
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#25 | |
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Band
Join Date: Feb 2008
Location: UK
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Velocity is speed in a certain direction. Seeings as the direction changes, i'd say that's your answer.
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10-04-2012, 10:41 AM
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#26 | |
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Registered Sadist
Join Date: Jul 2004
Location: KY
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It wasn't initially, half of it is me second guessing my first answer. |
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10-04-2012, 10:47 AM
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#27 |
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Registered User
Join Date: Apr 2010
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ill give you an easy trick for you to use whenever you encounter such a problem:
whenever there's change in movement from the original direction to the opposed direction, velocity changes sign, and at the point where the change of directions happened, is whete the velocity is equal to zero. other info, acceleration is always depending on an applied force, in your case gravity, and if there is no other forces applied during the movement, acceleration will stay constant, so in you case it will stay constant. |
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10-04-2012, 10:50 AM
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#28 | |
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UG's Maggot Brain
Join Date: May 2006
Location: Milwaukee
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This. In much better words than I could put it in. Although I'm still not convinced that gravity and accelleration are the exact same thing and not just correlated. However, I'm a Communications major and haven't had to do this kind of shit in the greater half of a decade.
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10-04-2012, 10:50 AM
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#29 | ||
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Registered User
Join Date: Jun 2009
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These problems always start a the time when the ball or whatever has left whatever is producing a force on it. So, what is happening is that something (persons arm) is producing a force on it. Once it has left the arm, it is now in free 'fall' motion. There is nothing to accelerate it upward anymore, only gravity to pull it down. The higher the velocity the longer it will keep moving in the upward direction. So, you would most likely have an acceleration that gives the object speed but think of it as a force that creates acceleration F = ma. Quote:
Gravity is a Force that causes acceleration on objects within it's field. F due to gravity = (G)m1m2/d^2. G is universal gravitation constant, m1 and m2 are masses of two objects, and those three terms divided by the distance between them squared gives the force of gravity. Which you can then apply to F = ma (I'm pretty sure... it's been awhile since I've done this).
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I have a huge fear if rays. Last edited by ChrisBW : 10-04-2012 at 10:57 AM. |
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10-04-2012, 11:08 AM
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#30 | ||
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Bristolian
Join Date: May 2009
Location: Bristol, UK
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Yeah, it's velocity.
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10-04-2012, 11:30 AM
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#31 |
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UG's Resident Dhampyr
Join Date: Nov 2008
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Velocity. I think everyone's covered why it's not acceleration, but not why it's not position.
Your problem states that it starts at Y=0, goes up and comes back to it's starting point at 0 therefore it was always positive and didn't change sign.
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10-04-2012, 11:37 AM
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#32 | ||
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UG's Apprentice Physicist
Join Date: Dec 2006
Location: Somewhere In Scotland
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Gravity is just an acceleration. Gravitational force is caused by distortions in space/time.
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10-04-2012, 11:41 AM
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#33 | |
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Banned
Join Date: Jul 2006
Location: Sexy Presidential Palace.
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Magnus, what's your last name? |
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10-04-2012, 11:44 AM
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#34 | |||
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UG's Apprentice Physicist
Join Date: Dec 2006
Location: Somewhere In Scotland
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Seximus Decimus Aurelius. >_>
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10-05-2012, 05:25 AM
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#35 | |
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Banned
Join Date: Jul 2006
Location: Sexy Presidential Palace.
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<_< So it doesn't begin with a J?... >_> |
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10-05-2012, 05:54 AM
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#36 | |||
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UG's Apprentice Physicist
Join Date: Dec 2006
Location: Somewhere In Scotland
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10-05-2012, 06:11 AM
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#37 | |
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Banned
Join Date: Jul 2006
Location: Sexy Presidential Palace.
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Do you have.... Ginger hair? >_> |
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10-05-2012, 06:12 AM
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#38 |
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...BlTCH
Join Date: Mar 2011
Location: Recreational Meth Vehicle
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acceleration stays at -9.81m/(s^2). velocity is the property that changes, because the direction in which the object is travelling changes. SPEED doesn't change, velocity does. look into the difference if you don't know it already.
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10-05-2012, 06:13 AM
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#39 | |||
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UG's Apprentice Physicist
Join Date: Dec 2006
Location: Somewhere In Scotland
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No. GTFO.  That's just insulting brah.
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10-05-2012, 06:14 AM
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#40 | |
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Banned
Join Date: Jul 2006
Location: Sexy Presidential Palace.
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Oh, okay. So your surname isn't Johnston(e)? |
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