Cracking the AP Physics 1 Exam, 2020 Edition by The Princeton Review

Author:The Princeton Review
Language: eng
Format: epub
Publisher: Random House Children's Books
Published: 2019-09-09T16:00:00+00:00

ROTATIONAL MOTION

Previously, we covered objects that undergo circular motion. The next part of this chapter focuses on taking those objects and spinning them. Previous equations involved objects moving in a linear orientation or being manipulated into circular orbit. With rotational motion, we will need to take on a new set of equations that are analogous to the physics of linear motion.

If we recall from before, an object’s mass measures its inertia—its resistance to acceleration. The greater the inertia on an object, the harder it is to change its velocity. Harder to change its velocity means the object is harder to deliver an acceleration on—which in turn means the greater the inertia, the greater the force that is required in order for an object to be moved. Comparing two objects, if Object 1 has greater inertia than Object 2 and the same force is applied on both objects, Object 1 will undergo a smaller acceleration.

In the linear model, we put these in terms of force, mass, acceleration, and velocity. When it comes to rotational kinematics, we need to change up a few of these terms:

Linear Kinematics

Rotational Kinematics

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