Date

Topics

Assignment

Mon, Mar 29
A4  23 days  ends Apr 28

Welcome Back!

 Review  Work:
 Ch 8 (p. 262) #109115odd
 Ch 9 (p. 298) #37, 39, 43, 45 (Note: The yaxis passes through m_{1} and m_{3}, not m_{1} and m_{4}.), 47


Ch 9 Rotation
 93 Calculating the Moment of Inertia
 Rotational inertia of a particle
 Rotational inertia of a system of particles
 Rotational inertia of an extended body
 Parallel Axis Theorem: I = I_{cm} + Mh^{2}
 Moment of Inertia of Common Shapes (Table 91, p. 274)
 94 Newton's Second Law for Rotation
 Torque  "turning force"
 depends on:
 amount of force
 more force more rotational acceleration
 direction of force
 force perpendicular to radius  maximum acceleration
 force parallel to radius  no acceleration
 where the force is applied
 more radius  more rot. acceleration
 Calculating torque
 (see Fig. 918 p. 280)
 Actually
 direction: righthand rule (torque is an axial vector)
 in problem solving, counterclockwise is +, clockwise is  (by convention)
 Even though torque has units N^{.}m, torque is not measured in Joules  torque is a vector, work is a scalar.
 Torque = force times "lever arm"
 Newton's Second Law:
 95 Applications of Newton's Second Law for Rotation
 Note: You have to account not only for all of the forces on an object, but where on the object the forces are applied
 Rod pivoted at one end (see examples 96 and 99)
 Accelerating a flywheel (see example 98)
 Massive pulleys (see examples 910 and 911)

 Read and Study:
 Work:
 Ch 9 #6871, 73
 Answers: 68) (a) v = 3.95 m/s, (b) 49.3 rad/s 70) v = 2.79 m/s, = 34.9 rad/s

Wed, Mar 31
(Mr. S absent)

Work Day 
 Catch up on your assignments.


96 Rolling Objects
 "Rolling without slipping" concepts
 the role of friction
 motion of:
 the point of contact between the wheel and surface
 the center of the wheel
 the top of the wheel
 rotation about:
 point of contact
 center of the wheel (rotation + translation)
 Kinetic energy of a rolling object
 Objects rolling up and down inclines
 Who wins the race between a disk, a sphere, and a hoop?
 Conservation of Energy approach
 Newton's Second Law approach (What is the friction force?)
 Rolling with slipping  the bowling ball problem
 initial conditions  the effect of friction
 time for which


Fri, Apr 2

Chapter 10 Conservation of Angular Momentum
 101 The Vector Nature of Rotation (review for us)
 Righthand rule
 Cross product
 102 Torque and Angular Momentum
 Angular Momentum, L, of a particle

 Read:
 Answer:
 Ch. 10 #19odd, 4346
 Answers: 44a) 28.0 kg m^{2}/s, 44b) 32 kg m^{2}, 44c) 0.875 rad/s


Ch 10 Conservation of Angular Momentum
 103 Conservation of Angular Momentum
 From Newton's 2^{nd} Law for Rotation: , so if the net torque on an object (system) is zero, the rate of change of its angular momentum will be zero.
 In other words, if the net torque on a system is zero, its angular momentum will not change.
 Conservation of Angular Momentum in a bicycle wheel
 Vector nature of angular momentum
 Summary of Linear and Rotational Dynamics Equations

 Read:
 Work:
 Ch 10 #12, 49, 51, 55, 57


Ch 11 Gravity
 111 Kepler’s Laws
 First Law  Orbits are ellipses with sun at one focuw
 Second Law  Radius vector sweeps out equal areas in equal times
 Third Law  T^{2} = kr^{3}
 mean distance = length of semimajor axis
 112 Newton’s Law of Universal Gravitation
 Derivation of Kepler's Laws
 113 Gravitational Potential Energy
 Using a graph of gravitational potential energy
 Escape energy
 Escape velocity
 Energy in a circular orbit
 114 The Gravitational Field and g
 g as a measure of gravitational field strength

 Read:
 Work:
 Ch 11 #19odd, 15, 17, 21, 23, 37, 4349odd, 53, 57, 59


Ch 11 Gravity (continued) 
 Finish the Ch 11 assignment

Thu, Apr 8 


Fri, Apr 9 





Tue, Apr 13 
Ch 12  Static Equilibrium
 Conditions for static equilibrium:
 F_{net} = 0 in both the x and y directions
 about any axis
 Examples

 Read:
 Work:
 Ch 12 #1, 2 (ans: false), 9, 14 (ans: 1.4 m), 28 (ans: (a) Forces are T_{1}, T_{2}, and F_{H}, (b) 139 N), 49


Ch 14 Oscillations
 Simple Harmonic Motion (SHM)
 If the net force on an object is a Hooke's Law force (F_{net} = kx), the object will move in simple harmonic motion.
 Where:
 SHM and circular motion
 Examples



Ch 14 Oscillations
 142 Energy in SHM
 143 Some Oscillating Systems
 The simple pendulum
 The physical pendulum

 Read:
 Work (The last assignment in AP Physics):

Fri, Apr 16
Convo Schedule:
3rd block: 12:141:19
P.P.: 1:191:25
4th block: 1:252:30

Ketchup Day

Finish up your assignments.

Mon, Apr 19 


Tue, Apr 20 











Mon, Apr 26 


Tue, Apr 27 


Wed, Apr 28
End of A4  20 days 

