Newton's First Law

I had jury duty today, so your assignment was to read and take notes on sections 4.4 and 4.5 in the blue book OR sections 3.4 and 3.5 in the brown book. These have exactly the same information; they are just different editions.

These sections talk about Newton's First Law and the difference between mass and weight.

The Wikipedia article on Newton's First Law is actually pretty good, which you can find here. The Law basically says that without a net force acting on it, an object will just keep doing whatever it was doing. If it was at rest, it'll stay at rest. If it was already moving, it will keep moving in a straight line.

Here is a nice tidbit on the difference between mass and weight. On Earth, an object weighs 9.8 Newtons for every kilogram of mass it has. For example, I have a mass of about 60 kilograms, so on Earth I weigh about 588 Newtons (~133 pounds). On the moon, where the gravity as about one sixth as strong, I would still have a mass of 60 kilograms, but I would weigh only 98 Newtons (~22 pounds).

Homework tonight is "Force and Newton's First Law." We will go over some of the problems when I get back tomorrow, and it is due tomorrow.

Forces and Welcome Back

Today we went over some class procedures/rules and heard about some of your adventures over the break. We also defined a force and learned how to name them.

No homework tonight.

My Bad

Oh dear - I certainly am behind on updates, eh? Please use the labels or search box to search for past years' notes until I can find the time to get this up to date.

Acceleration

Don't forget to turn in yesterday's homework: Ranking Tasks: Velocity I and Relativity.
Tonight's homework: Ranking Tasks: Velocity II and Acceleration II.

Velocity and Relativity

Don't forget to turn in last night's homework, Kinematics I.
Tonight's homework: Ranking Tasks: Velocity I and Relativity.

Position and Speed

Homework tonight: Kinematics I

Energy Levels and Light