Dec 19th 1:15

Do you know the mass of your vehicle? Bring it to class to find out! I will post the rubric for the essay by tomorrow. The essay is due when you get back from vacation. Great job building and rebuilding your vehicles. Engineering is hard work!

12-13 12:20pm

Go to work and power questions in student resources and complete the assignment.

Dec 3 and in class Tuesday

You can start this at home. You have all of class on tuesday to try to finish. You are not required to hand it in for a grade. You can work on it with someone if you are having trouble. Show all your work and we will go over it on Wednesday. Try the problems on your own and then check for the correct answer and solution using the guided solution links. Go to: http://www.physicsclassroom.com/calcpad/momentum/problems.cfm

Nov 30 2:29 PM

Super job on the final everyone! Essay: Bring to class on Monday with the rubric scored and the essay underlined everywhere you got a point. For those of you that have still to do the essay I will place it here for you to read and make sure you answered all the parts. A person has a bow that takes 500N to fully pull back. They have put in the string a 0.1 kg arrow. Define Newton's three laws in terms of the person shooting an arrow. Describe what happens, and why it happens for each of Newton's three laws and the forces of friction ( and any other forces on the arrow). Describe what happens to pull back the string, and the result as you let it go. Also describe what could be done or forces on the arrow that would make the same shot go in three different locations other than the target they aim for. Each idea gets a paragraph,,,example: define Newton's first law...... it applies to the bow and arrow because... The arrow if shot over a target would...because.... define Newtons second law... it applies to the bow and arrow because... The arrow is shot with more _____ then._______...because or if the arrow was twice the mass then...because... define Newtons third law... it applies to the bow and arrow because... The force on the string is on the hand of the archer, and the force........because or the arrow would not go as far if the force...... then...because Also read 'The law of Conservation' on the Physics Classroom web page we looked at today in class. We will learn to do problems on Monday.

problem set

You must finish all the problems, as many of you did not do most of the problems.

nov 20

1. A force of 20 N acts upon a 5 kg block. Calculate the acceleration of the object. 2. An object of mass 300 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required to produce this acceleration. 3. A 5 kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. Calculate the acceleration of the object. 4. An object of mass 30 kg is in free fall in a vacuum where there is no air resistance. Determine the acceleration of the object. 5. An object of mass 30 kg is falling in air and experiences a force due to air resistance of 50 newtons. a. Determine the net force acting on the object by doing a free-body diagram with vectors….and b. calculate the acceleration of the object. 6. A student pushes on a crate with a force of 200 N directed to the right. What force does the crate exert on the student? 7. A force of 100 N is exerted on an object of mass 40 kg that is located on a sheet of perfectly smooth ice. a. Calculate the acceleration of the object. b. If a second object identical to the first object is placed on top of the first object, what acceleration would the 100 N force produce? 8. Just before opening her parachute a skydiver of mass 50 kg reaches terminal velocity. Calculate the force of air resistance. This means they go a constant velocity and acceleration is zero. 9. For a person who has a mass 60 kg, calculate the weight in Newtons and in pounds (find a conversion app).. 10. An object of mass 10 kg is accelerated upward at 3 m/s2. What force is required? If you have problems answering questions, call a friend to discuss it.

nov 14

Be ready to finish your presentations to Mr. Hennessy. If you already went, then you did a great job, but take notes on the posted presentations.