I need help explaining how a stationary object (like a rock) exerts a force without accelerating.
So, we are taught that force = mass times acceleration and acceleration is a change in velocity. Since velocity is a change in speed or direction, how can a stationary object exert force?
How is weight a force if force is defined as mass times acceleration?
- Posted:
- 3+ months ago by hmsteacher
- Topics:
- rock, force, weight, stationary, object, time
Details:
Answers (1)
There are two definitions of mass, f=ma and w=mg. We think m is the same in both equations, but nobody has found any way to prove it. Assuming they are the same, then weight is just a specially defined force. The gravitation constant g is an acceleration by definition. That is the limit of knowledge. Nobody knows anything more about gravity, except that the universal constant G is not constant. Nobody has any idea why.