00:01
Here we are going to examine the difference between mass and weight.
00:06
So a reminder that mass is the property of a single object, and it's often associated with the inertia of the object.
00:21
There's also gravitational mass, but it's the mass of a single object that interacts through gravity.
00:30
Weight, on the other hand, is the force of gravity between two objects.
00:38
So it's a force interaction pair.
00:45
So force of two objects interacting via gravity.
00:55
And as an example, let's take an astronaut who has a weight of 250 newtons on the moon.
01:03
From the units, we can tell that weight is a force.
01:07
And we're going to use the surface gravity of the moon, which is roughly one -sixth of what it is on the earth, 1 .63 meters per second squared.
01:22
And we're going to deduce the mass of this astronaut.
01:27
So weight is equal to mass times g...