Link for help with simple machines

Go to this link for help with simple machines.

Week of Nov. 8

Hope your weekend was restful. I know mine was. I'm grading the tests from last Friday, as I speak. I hope to have all of the grades in the system tonight.

1) We will have a major test over basic energy concepts and force on Friday. This will be a 100 point test over notes. A couple of problems will be involved. I will not be uploading notes for this test as the students should have them all. I will conduct a review on Wednesday.

2) We will be covering energy this week. I know its a short week, but students should have all they need to test by tomorrow.

3). We are approaching the middle of the quarter. Please make sure that you are completing all assignments on time and accurately.

Have a good week!

Sorry for these being a little late...Practice Problems

I'm giving the answers below with the questions. I strongly suggest you work the questions before you glance at the answers. The reason being that if you can write out each problem using the GUESS method and derive the equations, you will get the answer right.

1. A 40 kg deer accelerates from rest to a speed of 5 m/s in 1.5 seconds. What was the force needed to provide that acceleration?
2. A .5 kg ball accelerates downward at a constant rate of 9.8 m/s/s. What is the force on the ball?
3. A motorcycle uses 300 N to accelerate at a rate of 2.5 m/s/s. What is the mass of the motorcycle?
4. A baseball bat with a mass of 2.5 kg is swung with a force of 45 N. What was its rate of acceleration?

Practice Problems: Due Wed, November 3

1. How much force is needed to accelerate a 1200 kg car at a rate of 6.0 m/s/s?
   
2. How much force is needed for a 60 kg. runner to accelerate at a rate of 2.0 m/s/s?
   
3. How much friction force was used to slow down a car with a mass of 1200 kg at a rate of -3.8 m/s/s? (The value itself is not negative, but the negative sign implies the direction of the force is opposite the direction of travel
   
4. What is the forward acceleration of a 60 kg rocket in level travel that has an engine supplying a forward force of 1400 N?

This week (Nov 1)

Hopefully you had as restful of a weekend as I had. I'm getting caught up this afternoon and want to let you know what to expect this week.

1. Newton's Laws test has been graded. Some of you really helped your grade. Some of you bombed badly. Here's a deal: if you did poorly, come back in during growth period on Wednesday and re-take it. You have to know all of the laws anyway, so why not just work on them tonight and tomorrow and re-take them for full credit. That's a "no-lose" proposition, isn't it? :)


2. Many students are doing well so far. Please contact me if you are (or your child is) doing poorly, as I want students to succeed and will do all I can to help. Growth period is a must.


3. We will be finishing up force and acceleration this week and will test on Friday. I don't see this being a long test, but it will have several problems as well as some multiple choice and writing.


4. Notes for this unit are here. I will begin using folders on 4shared this week. It is much easier than Megaupload. Check this folder for Newton's Laws Notes

Good luck this week. Keep working hard.