11/6/09
Post date: Nov 06, 2009 12:53:43 AM
Bell Ringer: Which is more important in a machine, a high mechanical advantage or a high efficiency? Why?
Discuss final project
Design and carry out your own scientific study
Will be writing and present formal lab reports on your experiment
Overall projects will be due finals week, but we will have periodic due dates for parts of the project
You will make a presentation to the class about your research project.
Your project will be evaluated according to this rubric
Experiment idea is due next Wednesday at beginning of class. Please write a 1-2 paragraph summary of the experiment you are planning on conducting along with your hypothesis in if/then format.
Energy notes
Everything in the universe that ISN'T matter is energy (heat, light, sound, etc.)
Many types of energy, some of which we will use equations to find the amount of energy (measured in Joules, or J)
Kinetic energy
Energy of motion
Depends on mass and velocity of object
KE = 1/2*m*v^2
Potential energy
Energy of position, energy of height
Depends on mass, gravity, and height
PE = m*g*h
When one object does work on another, it is transferring energy to that object.
If I lift an object from the ground, and in the process I do 500 J of work on it, the object now has 500 J of potential energy
If I throw an object horizontally from rest, and in the process to 1000 J of work on it, the object now has 1000 J of kinetic energy
Work done on an object = change in energy for that object
Pages 221-224: 2, 3, 5, 7 Due Monday