Chapter 11 Rolling, Torque, and Angular Momentum

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Presentation transcript:

Chapter 11 Rolling, Torque, and Angular Momentum In this chapter we will cover the following topics: -Rolling of circular objects and its relationship with friction. -Redefinition of torque as a vector to describe rotational problems that are more complicated than the rotation of a rigid body about a fixed axis. -Angular momentum of single particles and systems of particles. -Newton’s second law for rotational motion. -Conservation of angular momentum and applications.

11.2 Rolling as Translation and Rotation Combined

11.3 The Kinetic Energy of Rolling A rolling object has two types of kinetic energy: a rotational kinetic energy due to its rotation about its center of mass and a translational kinetic energy due to translation of its center of mass. Rolling as Pure Rotation

Problem 2, Page 297 •2. An automobile traveling at 80.0 km/h has tires of 75.0 cm diameter. (a) What is the angular speed of the tires about their axles? (b) If the car is brought to a stop uniformly in 30.0 complete turns of the tires (without skidding), what is the magnitude of the angular acceleration of the wheels? (c) How far does the car move during the braking?