Physics momentum
Welcome! I'm excited to help you master the concept of momentum. Before we dive into the physics of how things move and collide, I'd love to know a bit about where you're starting from.
To help me tailor this session, could you let me know what your current level of physics knowledge is, or why you are interested in learning about momentum?
I'm a college student looking for a conceptual refresher.
Your path
Impulse and Change in Momentum
Conservation of Momentum
Types of Collisions
It is great to have you here! Since you are looking for a conceptual refresher, we will keep things focused on the core intuition behind these ideas, rather than just memorizing equations. Let's start with the absolute foundation: what is ?
What is Momentum?
The easiest way to define momentum is simply "mass in motion".
Every physical object has mass. If that object is moving, it has momentum. If it is sitting completely still, its momentum is zero.
To build an intuition for this, imagine a tennis ball and a massive bowling ball rolling toward you at the exact same slow speed. Even though they are moving at the same pace, you instinctively know that stopping the bowling ball with your foot is going to require a lot more effort than stopping the tennis ball. Because the bowling ball has much more mass, it has much more momentum.
Similarly, imagine two identical tennis balls. One is gently tossed to you, while the other is fired out of a high-powered tennis ball launcher. The faster one has much more momentum and is going to hurt a lot more to catch.
So, momentum depends directly on two fundamental variables: how much "stuff" is moving (its ) and how fast it is moving (its ).