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How many people wish they had more . Well be talking about such thing now. But before we talk about energy, i wanna talk about something that is somewhat related. We talked before about the idea of momentum. Remember momentum . Momentum is inertia in motion. And how do you get something moving if its not moving . How do you change the momentum of something . You push on it, and you provide whats called an impulse. Impulse, right . Impulse is not only force. Its not how hard you push only that will tell you how much momentum change youll get. Its how long you push. And we talked about how long ...

No, no, h okay. That is heavy, okay . If that anvil, all of a sudden, started like scooting across the table, you will look for some reason for that, wouldnt you . Maybe youll look for maybe a rope that you cant see or maybe a magnet or something. This is just not gonna move of itself, is it . Theres gonna be a reason for it to move. Hey, this is the 20th century, we know there are reasons for things, right . I take this ball, okay . This ball. Put this ball. That ball starts all of a sudden going up in the air. You will look for maybe a string that you cannot see or something, right . Things ...

Remember momentum . Momentum is inertia in motion. And how do you get something moving if its not moving . How do you change the momentum of something . You push on it, and you provide whats called an impulse. Impulse, right . Impulse is not only force. Its not how hard you push only that will tell you how much momentum change youll get. Its how long you push. And we talked about how long in terms of time, didnt we . We said force multiplied by time would be numerically equal to. You multiply the force that you exert on something, huh . Multiply it by the time that you exert on something, you ...

Heavy or light . Begin with the h. No, no, h okay. That is heavy, okay . If that anvil, all of a sudden, started like scooting across the table, you will look for some reason for that, wouldnt you . Maybe youll look for maybe a rope that you cant see or maybe a magnet or something. This is just not gonna move of itself, is it . Theres gonna be a reason for it to move. Hey, this is the 20th century, we know there are reasons for things, right . I take this ball, okay . This ball. Put this ball. That ball starts all of a sudden going up in the air. You will look for maybe a string that you canno...

And how could you tell whether or not the earth is at rest and the stars are going around us, or the stars are maybe at rest, were going around them . In fact, whats the nearest star . Begins with an s. You are now let me tell you. Begins with a s, ends with a n, got a u in the middle, try it. Sun. Sun. Very good, okay. Thats the sun. The sun is the nearest star, okay . And we go around, around, around the sun, is that true . But it was one time thought thats not the case. And one of the arguments that was advanced to show that the earth really is at rest and not the other way around is the fo...