lecture13 - 1 Physics 1D03 Rotation(III Rotation(III •...

This preview shows pages 1–3. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Physics 1D03 Rotation (III) Rotation (III) • Torque and angular acceleration • “Moment of inertia” Text Sections : 10.7, and parts of 10.4, 10.5 Practice Problems: Chapter 10, Problems 21 a), 29, 37, 39 Physics 1D03 How much torque does it take to rotate a particular object? Better: How much torque does it take to change the rate of rotation ? What property of an object determines the response (angular acceleration) to an unbalanced external torque? Force causes linear acceleration: F net = m a Torque causes angular acceleration: τ net = I α ? 2 Physics 1D03 The angular acceleration of a particle is proportional to the net torque applied to it. Example : A particle accelerates in a circle. Break the net force on it into radial and tangential components. Only F t causes tangential acceleration: α τ I = F t F r r F t = ma t = m(r α ) , since a t = r α Multiply by r : rF t = mr 2 α or torque = ( mr 2 ) α for a single particle: I=mass × (distance from rotation axis) 2 Physics 1D03...
View Full Document

{[ snackBarMessage ]}

Page1 / 5

lecture13 - 1 Physics 1D03 Rotation(III Rotation(III •...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online