PH 235 Fall 2000

Exam 1 Fri September 22 2000 General Specifications

• Time from 1:35 - ... is for questions, etc.
• Exam starts somewhat at your discretion between 1:50 PM and 2:10 PM
• Exam ends at 3:20 PM sharp (when bell rings)

Exam Covers

• Chapter 11 (everything).
• Especially Definition of moment of inertia
• Parallel-axis theorem
• Calculating torque ( r x F)
• torque = I alpha
• rotational and linear equivalents
• linear velocity
• mass
• displacement
• kinetic energy etc.
• Warning: Do not mess up on a mass hung over a stationary pulley
• Use two equations, F=ma and torque = I alpha eliminate the tension from these equations
• Chapter 12 (everything) and motion of a gyroscope (see notes on this).
• This includes Rolling without slipping CM velocity and omega
• Two ways to calculate tangential velocity
• instantaneous velocity about stationary point which touches the ground
• cm velocity plus omega cross r (pure rotation about cm)
• Definition of angular momentum ( r x p for point particle, I omega for rigid body )
• Conservation of angular momentum
• Gyroscopic motion.
• Relate precession rate to spin rate of gyro See notes and diagram for this
• Chapter 13, Statics (but not Elastic Moduli)
• Rotational equilibrium problems and center of mass
• These require sum of forces =0 and sum of torques =0
• A statics problem can be made much easier by selecting the 'right' point about which to compute torques
• Laboratory and Class Experiments

Exam does not cover material on Elastic Moduli in Ch 13