Asked by Emily

"It takes a force of 109 N to lift a stone straight up. This force gives the stone an acceleration of 12 m/s^2. Calculate the mass of the stone."

My physics teacher tried to explain this problem to us, but he explained it so confusingly that I still don't get it (if that made sense.) Please help! Thanks!
Answered by Quidditch
f=ma
f=force
m=mass
a=acceleration

therefore,
m=f/a
The values for force and acceleration are given in the problem. Plug them in to get mass.
Answered by Emily
My teacher said something about subtracting the force of gravity (9.8 m/s^2) from the 12 m/s^2. I have no clue. I would love to have one of the online tutors comment on this, too. (please!)
Answered by bobpursley
The force has to support the weight, mg, plus the acceleration.

F= mg+ ma= m(g+a)
Answered by Quidditch
BobPursley--Thanks for correcting it! I was in too much of a hurry.
There are no AI answers yet. The ability to request AI answers is coming soon!