A 0,51kg heavy stone is in free fall, how heavy is the stone?

Thanks in advance :)

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- Sep 19th 2012, 11:16 AMcontrolsystemNewtons second law, help needed.
A 0,51kg heavy stone is in free fall, how heavy is the stone?

Thanks in advance :) - Sep 19th 2012, 11:21 AMcontrolsystemRe: Newtons second law, help needed.
Found out, i was looking at the wrong formula

- Sep 19th 2012, 11:31 AMemakarovRe: Newtons second law, help needed.
Would you mind sharing the answer? And what does "how heavy" exactly mean in the question?

- Sep 19th 2012, 06:07 PMOldspice1212Re: Newtons second law, help needed.
F=m*a second law

- Sep 19th 2012, 09:40 PMtopsquarkRe: Newtons second law, help needed.
- Sep 20th 2012, 06:38 AMHallsofIvyRe: Newtons second law, help needed.
You still haven't answered the basic question, "what do

**you**mean by "heavy", here?"

One way of defining "heavy" is the object's weight: "the force of gravity on an object" which is always "mg", the mass times the acceleration due to gravity. Since you give the mass in kg, use g= 9.81 m/s^2.

But more common is the force with which an object is pressing down on a floor, scale, your hand, etc. Here, since the object is not pressing down on anything there is no force- its "heaviness" is 0.