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.
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.
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.
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.
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.
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.
Momentum is a quantity that can be thought of as a description of "moving inertia." The faster an object is moving, the more momentum it has. The more mass the moving object has, the more momentum it carries. Momentum is a vector quantity. Momentum is also a way to express how much force is needed to get something moving or to stop the object in a time of one second. This force exerted over a time period is known as impulse.
THIS WEEK (1/17 - 1/20):
This week we will begin to take a look at objects that have momentum. An object can only have momentum if it is moving, so it is essentially "mass in motion." We will see how momentum relates to Newton's Second Law. The amount of momentum that an object has is dependent upon two variables: how much stuff is moving (mass) and how fast the stuff is moving (velocity). We will discuss how applying an impulse to an object changes its momentum, and what can reduce the amount of force needed to do so. We will then use the Impulse-Momentum Theorem to solve problems.
NEXT WEEK (1/23 - 1/27):
This week we will continue to study objects that have momentum. We will begin to look at the Law of Conservation of Momentum. We will discover that in order for momentum to be conserved in a collision, the system of objects must be closed and isolated - meaning that it cannot gain or lose mass, and there can be no external forces acting on that system of objects. We will see that forces exerted by the colliding objects on each other are equal in magnitude and opposite in direction. We will also use the law to solve problems.
☻LAB: Centripetal Force Lab: Due week of 1/16 on your lab day! FULL REPORT!
☻QUIZ: Momentum: FRIDAY 1/20
☻LAB: Momentum: Due week of 1/30 on your lab day!