A Ball That Rotates on a Turntable / Mr. Denjiro’s Happy Energy! скачать в хорошем качестве

A Ball That Rotates on a Turntable / Mr. Denjiro’s Happy Energy!

DENJIRO: Today, I’m going to show you an interesting phenomenon using this turntable here. First, I’m going to place a ball on the spinning turntable. Watch what happens. It rolled off. Now, let me try once again. GIRL: It’s not falling off anymore. DENJIRO: Did you notice? I made sure the ball was spinning before letting go so that it wouldn’t fall off. If the ball is spinning at the same speed as the turntable, then the ball will keep rolling in place even if I let go of my hand. It’s basically the same as someone running on a treadmill. Now, what will happen if I push the ball outward as it spins on the turntable? GIRL: Won’t it fall off? DENJIRO: Let me try. GIRL: It’s moving in a strange way. DENJIRO: It’s moving in circles. The ball doesn’t move in a straight line when I push it because of friction. So, how exactly is friction working here? Let me explain using a spring and a ball. The spring has been attached to a board, and the ball is attached to the spring. If I stretch the spring and let go, the ball gets pulled by the spring. Watch what happens if I pull the ball and roll it in a direction perpendicular to the spring. The direction of the ball changes due to the force of the spring, and the ball moves in a circle. When I pushed the ball on the turntable, the friction between the ball and the turntable created a force that was perpendicular to the direction the ball was moving in. It then moved in circles, just like with the ball that is attached to the spring. I hope energy will bring you all happiness. Our magic word is "Happy Energy!”