Philae may have scraped a crater during its landing

[Geo]

Gravity causes acceleration.

Usually, the term is used in combination with a device capable of providing thrust.

[Buster's Uncle]

Physicists and engineers use it to refer to falling objects gathering speed, honest.

[Geo]

Physicists I can believe. Engineers not so.

[Buster's Uncle]

Take it up with Isaac Newton.  I believe he started it.

[Unorthodox]

Usually, the term is used in combination with a device capable of providing thrust.

Only when talking earthbound, really. 

[Buster's Uncle]

It's part of the traditional terminology that goes with the math for calculating falls - Newton, again.

[Unorthodox]

g=9.8 m/s/s  Just like PI, one you just have to have memorized. 

Now, what g is for Philae, I got no clue.  Shape of that thing could make that a little more interesting to calculate precisely. 

[Buster's Uncle]

The g figure, like pics from duck-looking angles, are in previous stories I've posted...

[Unorthodox]

I haven't had much time till extremely recently. 

[Geo]

Okay. Guess this proves I'm still Earthbound.

[Buster's Uncle]

Don' worry, son; sumday yew can get yerself edumacated like us'uns, and be AstroModder.   Sumday.  Yepyep yep.
[turns and spits 'baccy on the ground; scratches self]

[Geo]

At least I'm not mudbound.

[Buster's Uncle]

Sez yew.