CENCO Rotational Dynamics Paradox
Unexpected results will grab students' attention
Looking for a simple, quick demonstration of forces and acceleration in circle motion? This large apparatus consists of two hoops mounted on a rigid shaft. Each hoop carries 2 drilled balls that can slide along the hoop. The balls on one hoop are heavy brass, those on the other are lightweight plastic. When the hoops are rotated by the shaft, you might expect that the different masses of the two kinds of spheres would cause them to take up different positions on the hoops. The effects are surprising! Includes complete instructions. Hoops are 30.5cm in diameter.
轉動力學疑題
看過一簡單、快速的演示圓週運動中力和加速度的變化嗎？此儀
器是兩個架在一金屬柄上的大圓環，各圓環上有兩個可移動的球
。一圓環上的球是很重的黃銅球，另一圓環上的則是輕的塑膠球
。當由金屬柄旋轉此兩圓環時，你可能會覺得由於球的重量不同
，會造成它們在圓環上的位置也不同。但事實上結果會讓你相當
驚訝！此儀器有詳細的說明。兩圓環的直徑為30.5公分。