A physics question

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thread starter UltraBallPok Mar 25 2010 + PM | QUOTE | PERMALINK | REPORT

Quick question that i just can't figure out, i remember my teacher talking about it today but i forgot, lol. anyways, ok so if you have like, say for example, a 6kg ball and a 12kg ball, the force of gravity acting on them is different, where the 12kg ball will have a greater force of gravity acting on it. But, if you were to drop both of them at the same time, why do they land at the same time? even though the force of gravity on the 12kg ball is greater?

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Riverstorm 03/25/10 + PM | QUOTE | PERMALINK | REPORT

The force of gravity isn't greater, it's the same. o_o So that's why they fall at the same time.

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Rhekett + PM | QUOTE | PERMALINK | REPORT

The acceleration due to gravity, g, is a constant for all objects, no matter what their mass.

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Torchalan 03/25/10 + PM | QUOTE | PERMALINK | REPORT

What RiverStorm said. Also note that this only applies in a place without air resistance, so you can't fully comprehend the logic behind this making it confusing for you and all of us that have not been in a vacuum.

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DrunkenD3mon 03/25/10 + PM | QUOTE | PERMALINK | REPORT

they both accelerate downwards at 9.8m/s2, thats why.

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whatgundamami 03/25/10 + PM | QUOTE | PERMALINK | REPORT

no its because although there is a greater force, theres a greater amount of inertia or something i think its supposed to cancel out the greater number theres a comic in my textbook on it, im trying to find it

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UberTacuIar + PM | QUOTE | PERMALINK | REPORT

He's getting confused with external forces, which is F=ma. Accounting the use of mass, which both acceleration and mass are directly proportional to force. So if mass or acceleration increases so does the force. As others said, FG is acceleration due to gravity, g, is constant and usually is used as 9.81 m/s squared. Having an greater mass will increase the amount of force but will not change the acceleration(delta velocity over time). The objects will fall at the same rate excluding factors like air resistance and surface area.

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IGotYourNoes 03/25/10 + PM | QUOTE | PERMALINK | REPORT

The force of gravity is the same on any mass no matter how heavy it is, explains why they land at the exact same time. Factors such as air resistance affect how fast the object drops.

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WebSurfer09 03/25/10 + PM | QUOTE | PERMALINK | REPORT

The acceleration of gravity affects both objects the same, which means they will go at the same speed (without air resistance) when dropped. Force is the product of mass times the acceleration (of gravity), so that would be different.

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halfness12 03/25/10 + PM | QUOTE | PERMALINK | REPORT

[quote] whatgundamami : no its because although there is a greater force, theres a greater amount of inertia or something i think its supposed to cancel out the greater number theres a comic in my textbook on it, im trying to find it [/quote] You obviously have absolutely no idea what the hell you're talking about.

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UltraBallPok + PM | QUOTE | PERMALINK | REPORT

Aha! Acceleration due to gravity, thanks Rhekett. To people that said the force of gravity is always the same, it's not. The accleration due to gravity is always the same Force of gravity acting on an object depends on the mass of the object. For 6kg ball: Fg = m*g Fg = 6*9.81 Fg = 58.86 N For 12kg ball: Fg = m*g Fg = 12*9.81 Fg = 117.72 N Anyways, acceleration due to gravity is what i was looking for, thank youu

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Rhekett 03/25/10 + PM | QUOTE | PERMALINK | REPORT

[quote] UltraBallPok : Aha! Acceleration due to gravity, thanks Rhekett. To people that said the force of gravity is always the same, it's not. The accleration due to gravity is always the same Force of gravity acting on an object depends on the mass of the object. For 6kg ball: Fg = m*g Fg = 6*9.81 Fg = 58.86 N For 12kg ball: Fg = m*g Fg = 12*9.81 Fg = 117.72 N Anyways, acceleration due to gravity is what i was looking for, thank youu [/quote] No problem man.

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shadow6190 03/25/10 + PM | QUOTE | PERMALINK | REPORT

Fg = Weight

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UberTacuIar 03/25/10 + PM | QUOTE | PERMALINK | REPORT

"Don't forget your units or i'll eat your points" lol, my teacher always says that. Anyway this is basic physics, usually you'd learn this in the beginning of the year. I hope this is not independent studying.

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UltraBallPok 03/25/10 + PM | QUOTE | PERMALINK | REPORT

Yea shadow, i know. and weight is also knows as the force of gravity acting on an object.. This isn't independent studying, i started physics about a month ago.. oh and my teacher is really forked up, everyone hates him cause he doesnt teach us anything on the test and then teaches us after LOL so im reading ahead in the textbook and learning everything cause i have a test tomorrow -_-

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