Homework Problems

Harmonic Motion #2 problem 3:
HRW915P041: Finding the moment of inertia, center of mass, and period of a physical pendulum

Gravitation #2 problem 7
HRW913P060:Find the total mechanical energy of two orbiting satellites before and after they collide.

Gravitation #2 problem 9
HRW913P089: Find the variations in total energy, potential energy, kinetic energy, and orbital speed for earth at perihelion and aphelion.

Gravitation #2 problem 10
HRW913P093: Find the velocity of an asteroid that strikes a planet if it started at infinity

Last Lecture

This is the last one...I think.

SHM and Uniform Circular Motion

Lectures: Pendulums

Torsion Pendulum

Simple Pendulum

Physical Pendulum

Lectures: Block on a Spring

Simple Harmonic Motion: Block on a Spring
Energy in Simple Harmonic Motion: Block on a Massless Spring

Lectures: Intro to Simple Harmonic Motion

Simple Harmonic Motion Intro

SHM Velocity and Acceleration

Homework Problems

HRW913P001: Find the ratio of m/M that maximizes the gravitational force between m and (M-m)
HRW913P002 Part A: Find the % change of the moon's gravitational pull on you from full moon to new moon
HRW913P007: Find where to place a third mass so the net gravitational force on a particle is zero
HRW913P013: Find the gravitational force of a lead sphere with a chunk taken out
HRW913P021: Find the minimum mass of a neutron star needed to keep stuff on its surface
HRW913P081: Find angular velocity of a binary star system. Find the escape velocity of a meteoroid leaving the system

Orbits Lectures

More lectures using gravity, but adding circular motion!

Kepler's Laws
Energy of Orbits

My Solar System

Today we're completing an online lab: My Solar System. Although I didn't write this lab (I found it on the PhET website) I really like it because it explores orbits, gravity, energy, and momentum. If you don't finish in class it is homework, due on Thursday.

Lectures: Universal Gravitation

For homework tonight please watch these two lectures:

Law of Universal Gravitation
Gravitation Near Earth's Surface

You might even start on your new WebAssign homework!

Homework Problems

#14: HRW911P089: A man on a platform stops the rotation of a wheel. Find the rotational velocity of the man+wheel+platform

#15: HRW911P090: Find the angular momentum of a person standing on the equator.

Conservation of Angular Momentum Lab

Today we worked on this lab. You also have new homework posted on WebAssign. Please post questions here or on the Facebook page.

Conservation of Angular Momentum Lab

Homework Problems

HRW910P015: A wheel with a constant angular acceleration is timed for an interval after starting from rest. How long was it spinning before the interval?

HRW910P028: Rotational kinematics involving two wheels coupled by a non-slip belt
HRW910P056: Find the acceleration of two masses fixed on the ends of a rigid massless rod on a fulcrum

Rotational Motion Lectures

Let's start a new unit!

Rotational Motion Variables

Converting Angular to Linear Variables

Homework Problems

HRW99P046: A mess kit explodes into two pieces, masses and velocities given. Find the velocity of the original mess kit

HRW99P101: Two shoe boxes collide and fall off a table. Find the final kinetic energy

HRW99P048: A spring pushes two balls apart; find their kinetic energies

Homework Problems

#1 on Momentum #2
#4 on Momentum #2
#15 on Momentum #2

Virtual Lab: Collisions

Today in class we worked through a free response problems then did a virtual lab: Collisions.

If you did not finish in class, please finish at home. I also need a few more Ballistic Pendulum labs and pre-labs from last week.

Homework Problems

#2 on Momentum #1: Two people in a canoe
#3 on Momentum #2: Dog walking on a boat

Ballistic Pendulum

Today we used a ballistic pendulum to find the launch velocity of a projectile. People have been using ballistic pendulums in this way for over a century.

First we completed a pre-lab to discover how a ballistic pendulum works: Ballistic Pendulum Pre-Lab

For your lab itself, this is what you need to turn in on your own paper:

1. Data table
2. Math (equation from end of pre-lab)
3. Answer
4. Name two errors, explain what they did to your data (mathematically), and how you could minimize or eliminate them in the future.

Series of Collsions and Two Kinds of Collisions

Finding the average force exerted on a target being hit by a stream of projectiles:
Series of Collisions

An overview of the two kinds of collisions. You might already know these from last year.
Collisions Part I: 2 Kinds

Lecture: Momentum Review - Some New Stuff

This is mostly the review we did in class on Friday, but I added a little more so it's worth watching.

Overview: Momentum, Impulse, and Recoil

Center of Mass Continued

Finding the Center of Mass in 2 Dimensions
Finding the Center of Mass for Objects of Uniform Density

Center of Mass Lecture

Today in class we went over some AP exam paperwork, then we had some fun trying to pick up chairs and touch our feet to explain center of mass. Here are two videos that dive into the quantitative side of finding center of mass.

Center of Mass System of Particles
Center of Mass Systems of Particles Example

Please watch these tonight, then try your new WebAssign homework.

KEYS Summer Internship

This looks like a great opportunity and experience. The application deadline is coming up, though, so get on it!

keys.pharmacy.arizona.edu