Thread: Newtons second law, help needed.

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

Found out, i was looking at the wrong formula

Would you mind sharing the answer? And what does "how heavy" exactly mean in the question?

F=m*a second law

Originally Posted by Oldspice1212

F=m*a second law

Actually Newton's 2nd is
(That's a capital sigma and means "sum of")

Which means you need to factor in the force of gravity as well. How would you do that?

-Dan

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.