Oh, wow, oh, oh, oh, wow, oh, oh, man.

Oh, my life.

And the world. Hello and welcome to the Science of Everything podcast, episode 17, energy, work and momentum.

So as you would have gathered from the title of this episode, today we're going to talk about momentum, work and energy.

We're going to, I'm going to divide the podcast into three sections.

First I'll talk about linear momentum, and then I'll move on to angular momentum, momentum in terms of

rotation, and finally a section on energy and work. And this podcast continues on

episode 13 on Newtonian mechanics, so it might be a good idea to listen to that first if you

don't have a basic knowledge of Newtonian mechanics. Okay, so start off with linear momentum.

What is linear momentum?

Linear momentum is equal to inertial mass times velocity.

So inertial mass, as we spoke about in podcast 13, is essentially the amount of stuff that

something is made of.

It's the mass that contributes to slowing down

of the object when it's a, when a force is applied to it, so the greater the inertial mass,

the less it accelerates. So linear momentum is equal to that inertial mass multiplied by

velocity. In fact, you can even restate Newton's first law as, in the form of,

in the absence of forces, the momentum of an object remains constant. Remember that the alternative way of stating

the Newton's first law is that objects will continue to travel at the same velocity in a straight line

until an unbalanced force acts upon them. Well, you can see that if an object is

travelling at the same velocity in a straight line, and obviously its mass is going to be constant,

then its momentum also has to be constant. So, we have this concept, linear momentum,

...