## 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**

Work and power describe how the external world changes the energy of a system. Work is the transfer of energy by mechanical means and is defined as the product of force and displacement in the direction of the force. Power is the amount of work done divided by the time needed to do the work, or the rate of doing work.

**
THIS WEEK (2/8 - 2/12):**

This week we will begin to take a look at Work and Power. We will investigate that in order for work to be done in physics terms, a force must be applied and the object must move a distance. What must also be true for work to be done is that the force and displacement must be parallel to one another. If a force is applied at an angle, then we must take the cosine of the angle in order to get the correct component of force to calculate the amount of work done. We will then take the amount of work done on an object and calculate the amount of power exerted.

**NEXT
WEEK (2/15 - 2/19):**

This week we will continue to work with work and power. We will solve problems by first determining if work is being done and then applying the information to the correct formula. We will also calculate the amount of power used by an object. We must remember the units for work and power, where work is measured in Newton-meters, which is equal to a Joule, and power is measured in watts.

**Upcoming
Tests/Quizzes/Labs**

☻**AP
APPLICATIONS:
CLICK HERE**

☻**LAB:
Student Power Lab: Due w/o 2/15 on your lab day (except
period 1)!!!**

☻**QUIZ:
Work and Power - FRIDAY 2/19**