美国（USA）高中物理教材原理与问题第八章.pdfVIP

What You’ll Learn • You will learn how to describe and measure rotational motion. • You will learn how torque changes rotational velocity. • You will explore factors that determine the stability of an object. • You will learn the nature of centrifugal and Coriolis “forces.” Why It’s Important You encounter many rotating objects in everyday life, such as CDs, wheels, and amusement-park rides. Spin Rides Amusement- park rides that spin are designed to thrill riders using the physics of rotational motion. The thrill is produced by a “force” that is present only when the ride spins. Think About This Why do people who ride amusement-park rides that spin in circles, such as this one, experience such strong physical reactions? 196 Paul L. Ruben How do different objects rotate as they roll? Question Do different objects of similar size and mass roll at the same rate on an incline? Procedure Critical Thinking Which of the objects’ 1. You will need a meterstick, a piece of foam properties may have contributed to their board, a ball, a solid can, and a hollow can. behavior? List the properties that were similar and those that were different for each object. 2. Position the foam board on a 20° incline. 3. Place the meterstick horizontally across the foam board, near the top of the incline, and hold it. 4. Place the ball, solid can,