# PH.5 b - Uniform Circular Motion

The student will investigate and understand the interrelationships among mass, distance, force, and time through mathematical and experimental processes. Key concepts include

b)  uniform circular motion.

Bloom's Levels:  Analyze; Understand

### BIG IDEAS

• I can explain why roller coasters don't fall off the track when they go upside down.

### UNDERSTANDING THE STANDARD

The concepts developed in this standard include the following:

• An object moving along a circular path with a constant speed experiences an acceleration directed toward the center of the circle.
• The force that causes an object to move in a circular path is directed centripetally, toward the center of the circle.  The object’s inertia is sometimes falsely characterized as a centrifugal or outward-directed force.

### ESSENTIALS

In order to meet this standard, it is expected that students will

b) distinguish between centripetal and centrifugal force.

describe the forces involved in circular motion.

### KEY VOCABULARY

Updated: Dec 01, 2017