## 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

**Motion quantities can be
divided into two categories - vectors and scalars. Our focus
now will be on vectors - a quantity that describes both
magnitude and direction. The emphasis of vectors is to
understand some fundamentals about vectors and to apply the
fundamentals in order to understand motion and forces that
occur in two dimensions. The most common example of an
object that is moving in two dimensions is a projectile.
A projectile is any object that once **
**projected****
or dropped continues in motion by its own **
**inertia****
and is influenced only by the downward force of gravity.**

**
THIS WEEK (10/21- 10/25):**

This week we will begin our focus on vector components. When analyzing motion, it is often necessary to utilize the individual x and y components. First we will draw vectors correctly on the coordinate plane and find the resultant vector with direction. Then, we will determine what the x and y components are when given a resultant vector. SOH-CAH-TOA and the Pythagorean Theorem will help us to determine these vectors and their respective angles.

**NEXT
WEEK (10/28 -
11/1):**

This week we will apply our understanding of vector analysis to projectile problems. There are 2 types of motion that we will study in regards to projectiles. First we will calculate quantities when an object is launched horizontally from a certain height - where there is only an initial x - component for motion. Then, we will calculate quantities when an object is launched at an angle, giving it both an initial x - component and an initial y - component for motion.

# Upcoming Tests/Quizzes/Labs

☻**LAB:
ACCELERATION LAB #2 - DUE THE WEEK OF 10/21 ON YOUR LAB
DAY!**

☻**QUIZ:
MON
10/28 - Vectors**