Another gravity question.
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thread starter Kunabu Sep 30 2010
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| I have 2 tennis balls, both are exactly the same except for the weight, one heavier and one lighter. If I roll both of them down hill from the same point, at the same time and at the same starting speed, which ball would reach the bottom of the hill first? This is assuming the hill is completely smooth. EDIT: THIS QUESTION IS ASSUMING THERE IS NO AIR RESISTANCE. |
My Characters: BigBluePanda - 52 Windia Fighter
Kunabu 09/30/10
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| My drawn conclusion is: the lighter tennis ball will roll faster because the mass is less, so it would need less force to accelerate it so it would roll faster. A heavy tennis ball would require more force to push, so it would roll slower. |
My Characters: BigBluePanda - 52 Windia Fighter
vcxsinal
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| [quote] Kunabu : My drawn conclusion is: the lighter tennis ball will roll faster because the mass is less, so it would need less force to accelerate it so it would roll faster. A heavy tennis ball would require more force to push, so it would roll slower. [/quote] That's a popular theory, but that's also the wrong theory. It's very logical, but no, that's incorrect. No offence, but we're just tryin ta educate you. |
My Characters: SlushieGuy - 122 Windia Night Lord
Kunabu
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| [quote] vcxsinal : That's a popular theory, but that's also the wrong theory. No offence, but we're just tryin ta educate you. [/quote] Well, you don't pitch when they're not ready to swing. I don't get the formulas and crap you guys are posting. I just wanted an answer. BOTH TENNIS BALLS WILL BE ROLLED AT THE SAME SPEED! |
My Characters: BigBluePanda - 52 Windia Fighter
ShiroNoYami 09/30/10
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| [quote] Kunabu : My drawn conclusion is: the lighter tennis ball will roll faster because the mass is less, so it would need less force to accelerate it so it would roll faster. A heavy tennis ball would require more force to push, so it would roll slower. [/quote] Mass is irrelevant in this situation. The acceleration of both tennis balls will be the same even if one is three times as dense as the other; the mass in Newton's F=ma (if that's what you're basing your conclusion off of) is canceled out when work out the equation. Only gravity and the angle of the ramp matters in situations like this :P Notice how the equation to find out the acceleration of objects coming down from ramps is independent of mass: acceleration = gravity x sineθ |
My Characters: negaiishi - 76 Khaini Sniper
ilyToaster 09/30/10
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| The gravity is the same a=9.8 m/s^2 The speed is the same No Air resistance yea they should go the same speed. |
My Characters: ilyToaster - 113 Scania Ranger
Srish 09/30/10
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| [quote] Kunabu : Well, you don't pitch when they're not ready to swing. I don't get the formulas and crap you guys are posting. I just wanted an answer. BOTH TENNIS BALLS WILL BE ROLLED AT THE SAME SPEED! [/quote] If people just give you the answer, you won't be learning. Also, with the formulas people gave you, you can pretty much figure out the answer if you look at them. |
My Characters: ImaAssaulter - 109 Bera Chief Bandit
yatpang1 09/30/10
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| lol if anyone here post that it reaches the bottom at sametime, shame on u. Newton knew this, but he skipped it, sayin that objects fall at the same rate because most objects, m/M = ~0 However, notice its rounded, because objects DO NOT fall toward the earth, it falls toward the center of mass. |
My Characters: Fatury - 118 Broa Dragon Knight
vcxsinal
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| [quote] Kunabu : Well, you don't pitch when they're not ready to swing. I don't get the formulas and crap you guys are posting. I just wanted an answer. BOTH TENNIS BALLS WILL BE ROLLED AT THE SAME SPEED! [/quote] Do you understand what 9.8 meters per second is? That's how fast objects drop assuming they don't have any air resistance. ANY object. It's the same with your teachers question, except its on a hill. But they will both still hit the floor at the same time. EDIT: thats okay then, your teacher will tell you the same thing tomorrow :D |
My Characters: SlushieGuy - 122 Windia Night Lord
ilyToaster 09/30/10
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| [quote] vcxsinal : Do you understand what 9.8 meters per second is? That's how fast objects drop assuming they don't have any air resistance. ANY object. It's the same with your teachers question, except its on a hill. But they will both still hit the floor at the same time. EDIT: thats okay then, your teacher will tell you the same thing tomorrow :D [/quote] It's 9.8 meters per second SQUARED |
My Characters: ilyToaster - 113 Scania Ranger
Kunabu 09/30/10
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| [quote] Srish : If people just give you the answer, you won't be learning. Also, with the formulas people gave you, you can pretty much figure out the answer if you look at them. [/quote] Pretty sure I'll be learning something if you tell me WHY and HOW. And obviously, I don't know how to use the formula. You people were no help at all. Where are the other people who answered my previous question? |
My Characters: BigBluePanda - 52 Windia Fighter
DarkFlare666 09/30/10
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| Both arrive at the same time, gravity in earth is a constant, The size or weight doesnt matter. |
My Characters: Angelouis - 72 Scania Crusader
MsDit 09/30/10
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| [quote] Kunabu : I have 2 tennis balls, both are exactly the same except for the weight, one heavier and one lighter. If I roll both of them down hill from the same point, at the same time and at the same starting speed, which ball would reach the bottom of the hill first? This is assuming the hill is completely smooth. EDIT: THIS QUESTION IS ASSUMING THERE IS NO AIR RESISTANCE. [/quote] if youre in ap physics c the answer is the lighter ball because of the force of rolling friction if not then same time |
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heyalex 09/30/10
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| Assuming no air resistance, they would both hit the ground at the same time. |
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Amarlista 09/30/10
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My Characters: Anyalista - 38 Broa Aran in Memory
j0s3a4d 09/30/10
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| Since they are both solid spheres and the only difference is the mass then they both fall at the same time. I was about to go all in-depth with Rotational Energy equations and then I saw you post that you were in 7th grade. |
My Characters: iatLnbandLt - 107 Broa Chief Bandit
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