What are forces and can I multiply them?

What are forces and can I multiply them?

Professor Gizmo (Amazing Science Presentations) gives expert video advice on: How do we make sounds that are both high and low?; How do my eyes play tricks on me?; What is the difference between a solid, a liquid and a gas? and more...

A force is a push or a pull. How can you get more of a force? You can actually multiply forces together to increase the force. Here's a little example of that. We're going to use a couple of tennis balls to show you this. First of all, I'm going to hold this about eye height, and I want you to kind of watch how high it's going to bounce again. OK? We're going to record that. So I'll start it here; about this high? Try it again. Yup, that's about right. So, it was about this high. Remember that. I need two - oh! That's a big tennis ball! OK. Well, let's see how high this tennis ball bounces. We'll put this about eye height, drop it; it was about the same, wasn't it? OK. Yup. Just about the same. Now, we're going to multiply the force from this much bigger tennis ball, into this tennis ball. So, when I put this one on top, we're going to drop these together, and when I do that, the bottom one's going to hit the table, it's going to start coming up, and it's going to apply its force all into this tennis ball. This tennis ball is going to go up; we'll see how high it will go up. This one won't go up quite as high. So, we'll watch. Whoa! That tennis ball went! Now this one, it didn't bounce as high, because some of the force of this tennis ball was applied into that tennis ball. That's how you can multiply forces.