00:01
So here we have kind of a trick question.
00:04
So let's imagine a different scenario first.
00:06
The real one here is a rock being dropped off a cliff.
00:09
Let's imagine the rock just sitting on the cliff and we know it has a mass of 13 kilograms.
00:15
What is its weight? well firstly we know that weight is equal to mass times the acceleration due to gravity.
00:23
Now unless rocks are magically dropping themselves off the cliffs off mars, we're going to talk about earth here and the acceleration due to gravity on earth is 9 .81 meters per second squared.
00:36
So in this static case we can find the weight very easily.
00:41
13 kilograms times 9 .81 meters per second squared and the units of this is newton's force.
00:53
So weight is equal to 127 .5 newtons and if we forget the units here, let's look at this in relation to newton's second law.
01:04
F is equal to ma.
01:06
So we know forces in newton's.
01:07
We have a mass and an acceleration...