CP Physics

Basic concepts of momentum and energy defined.

Momentum: Strength of an object's motion
momentum = mv
Relationships in this equation
Unit analysis

Impulse-momentum relationship
Airbags, eggs, etc.

Conservation
The total does not change

Collisions
Elastic and Inelastic


EGG DROP

Design a vehicle to transport an egg from a 5 meter drop (balcony to concrete) dropped from rest, that meets the following conditions:

The egg must survive.
A = egg doesn't break
B = egg cracks
C = egg leaks
D = parts go flying
F = 50% , rules broken (doesn't qualify)

The rules are (simulating the engineering challenge facing a car designer)

You can only use the materials listed below.
10 paper clips
100 standard straws (bendy is ok)
hot glue
string (10 feet)
tape (only to connect things)
4 rubber bands
1 egg carton cup
1 sheet of notebook paper 8 1/2 x 11
1 piece of foil (1 foot square max)
1 quart size baggie
1 balloon

Construction goals
The vehicle must have a door
The egg must be removable (i.e, not permanently attached)
Grade A large eggs will be used
No flying or floating; no parachutes or lighter-than air balloons, propellors or wings
A window must be provided 1 x 1 inch where the egg can be seen during the drop
Maximum size 2ft x 2ft x 2ft (so it will fit on the road)

During the drop the BOTTOM of the device will be at the specified height. You will drop the egg on my signal. The ground will be concrete covered in plastic.

Do not use glue, tape and string for buidling materials or structural members. These things are only for connecting other things together.

You may cut parts apart such as straws or the plastic bag.

Bonus prizes awarded for best looking (successful) car and car with the smallest overall mass prior to the drop.

This looks like an excellent review guide and animation site for basic physics concepts.
Physics Classroom Table of Contents

First result of the SNLS

Britain, UK news from The Times and The Sunday Times - Times Online

The test on Monday will cover Newton's three laws as we previously reviewed.
Open notes, closed book, calculators allowed and encouraged.

For the test on Newton's Laws you should be able to:

Combine multiple force vectors with drawings.
Break vectors into x-y components.
Apply each of Newton's laws to real situations
State each of Newton's laws
Amend the traditional statement of each of Newton's laws to make it more scientifically accurate
Analyze action and reaction force pairs
Explain why actions and reactions do not cancel out
Solve F = ma for each of the three variables, describe the relationship between each of the three pairs of variables, including the names of the relationships and the graphs generated from experiments.
Analyze the set up of an Atwood's machine and use differences in mass to predict net force and acceleration.
Know the variables, units, and quantities for each of the variables in Newton's laws.

Turn in the rocket homework, and go over some recent homework.
We will be having a test over Newton's Laws soon.

Physics of rockets.

We'll fire a test rocket today.

We watched the rocket fly with an A8-3 engine and a B6-4 engine. We measured the altitude with tracking guns, and estimated it in advance using Newton's Laws.

Lab is due BOC. Homework assigned earlier is due today as well. While you finish up these things I'll be doing grade checks.

Finish lab reports, which are due today.
There is a credit problem homework assignment from the plug and chug sections.

These will be turned in and corrected in detail, so make sure you do all parts of each problem.

Page 57 PC 1,3,5; TE 3,5,7,8,10
Page 71 PC 1-5; TE 1,2,5
Page 84 TE 2,9,11,14,15
PC = plug n chug
TE = think and explain

Due Tuesday.

Collect lab data on the Smart Pulley by changing the total mass, then measuring acceleration. Keep the force the same.

Collect 5-6 different data points using the equipment, then writeup the lab using the standard lab format:

Hypothesis
Variables
Procedure
Data
Graphs
Conclusion