## Sunday, February 16, 2014

### Heavier things do fall faster

Heavier=more massive
More mass=stronger gravitational pull
Stronger gravitational pull=faster acceleration

Jupiters mass > earths mass
Jupiters gravitational pull > earths gravitational pull
Jupiters acceleration > earths acceleration

Then why do things seem to fall at the same rate?
Because gravity is a very weak force, as in, it takes a lot to see a change.

The earth is MUCH bigger than the moon.
Yet when our austronauts walked on its surface, the difference in gravitational pull was almost unnoticeable.

If you can barely see a difference between the earth and the moon, what makes you think that you would see a difference between a tennis ball and a bowling ball?
The experiment Is inherently flawed.

Imagine if one dropped a black hole instead of a bowling ball?

1. Umm...no one believed that things fall at the same speed :) The time it takes for an object to fall is given by this equation: t = square root of (2*d / g). So it's twice the distance divided by the gravitational constant. But this is only what we get to learn in scool :) The complete formula states clearly (and Newton stated it by the way) - g must be replaced by something else when dealing with astronomical bodies outside of Earth. The complete formula given by Newton and not shown in schools is: t = sqrt(2*d / G(M+m)/r^2. G is still the gravitational constant, but both masses get added this time, and also the radius from the falling object to the center of the body is there. So, I understand your confusion - but it's not Newton's fault. It's the educational system's fault.

2. You have not disproved anything, you have just proved you do not understand physics.

Grab your book and read it again. Read over the Second Newton Law and then come back and excuse yourself.

"Stronger gravitational pull" as you state it is a Force, and since F=ma you need to divide the force over the mass to get the acceleration. The bigger the mass, the SMALLER the acceleration, for a given force. But since the force contains the same mass itself, they cancel out so you get exactly THE SAME acceleration for all bodies under gravitational attraction.

It is good to question things. It is good to think out of the box. I encourage you to continue doing so. But you need solid foundations if you want to achieve anyhing.

3. What world are you in? If you mean the "real" universe, you have not taken into account the pull of the moon and other forces acting on the objects near the surface of Earth. There are times of high and low tides. Technically when the tide is high, objects experience a bit less pull toward the earth (like the water in the sea).

It is impossible to verify or critique your thoughts listed here as you have not defined what the assumptions are. But it is funny. You say yourself that there is no noticeable difference between the force on a tennis ball versus a bowling ball. If so, doesn't that mean F = ma totally holds for most practical matters?

Be careful! Especially when correcting that which is accepted!