## Ms. Robak

# Email Info

If for any reason you will be absent from class and know in advance, please notify me by email so that I can ensure you receive the work that you need in order to stay with the class.

# Extra Help

# Grades

PHYSICS

PHACTS

TOP 5 FACTS:

PHYSICS OF TIME

**First in time**

The Egyptians were the first culture to become interested in timekeeping, building giant obelisks in 3500BC to act as giant sundials.

**Augustus**

In 8BC the Roman senate gave ruling emperor August Caesar his own month (August, if that wasn’t obvious…) and added an extra day to match his great uncle Julius Caesar’s month (yep, July!) on 31 days.

**Daylight**

Throughout World War II citizens in the United States kept their clocks one hour ahead of standard time to allow for longer working hours during daylight.

**Minuscule**

The world’s smallest atomic clock, built by the National Institute for Standards and Technology, is the size of a grain of rice and accurate to one second in 3,000 years.

**Samoa**

In May 2011 Samoa decided to move its clocks forward by one day to allow easier trade with Australia and New Zealand, after spending 119 years almost a day behind.

**Physics News**

**V****ectors
are important because they are the mathematical way to
represent relationships involving position, velocity and
acceleration of moving objects. If you want to model "real
life" you need to work in three dimensions, and vectors take
care of that. ****Knowledge of
vectors is important because many quantities used in physics
are vectors. If you try to add together vector quantities
without taking into account their direction you'll get
results that are incorrect.**

**
THIS WEEK (10/24 - 10/28):**

This week we will begin to look at vectors. We will understand that the order of vector placement does not affect the sum, and how to graphically draw vectors utilizing degrees and direction. We will see how vectors are a graphical representation of motion - we will find the resultant vector when given the x and y components as well as finding the x and y components from a resultant vector. We will also explore boat problems and understand how current affects the motion of a boat when traveling upstream or downstream

**NEXT
WEEK (10/31 - 11/4):**

WThis week we will begin to look at
projectile motion. We will recognize that the vertical and
horizontal motions of a projectile are independent of each
other. We will relate the height, time in the air, and
initial vertical velocity of a projectile using its vertical
motion, and then determine the range using the horizontal
motion. We will see how the range of a projectile depends
upon the acceleration due to gravity and upon both
components of the initial velocity. The path a projectile
takes, or its trajectory, is a curved path in the shape of a
parabola.

**Upcoming
Tests/Quizzes/Labs**

☻**LAB:
Acceleration Lab 2: Due The week of 10/24 on your lab day!
(except period 3)**

☻**TEST:
VECTORS: Week of 10/31 DURING YOUR LAB PERIOD!**

☻**QUIZ:
PROJECTILES: THURSDAY 11/3**

☻**TEST:
PROJECTILES: WEDNESDAY 11/9**