Lot’s of wrong on this thread.

Gravity is a force, and is very much dependent on mass – as per burnie’s equation. Of course, the acceleration that results from a force is also dependent on mass (a = F/m) , so in the absence of other forces, the resulting acceleration will be the same.

Of course there is another force – air resistance, and for “similar build” let’s assume they’re the same.

a = F / m

F = F(g) – F(a)

where F(g) = force of gravity = g * m

and F(a) = force due to air resistance which is independent of mass (for “similar build”)

This gives:

a = (g * m – F(a)) / m = g – F(a)/m

A higher mass reduces the impact of the air resistance, and so will accelerate faster.

EDIT – of course it’s not really g * m except on a vertical slope, it’s some fraction of it, but it makes no difference to the conclusion.

Posted 4 years ago