September 27

Power
While reading articles, it is important to read critically. There was a magazine article that talked about how the average refrigerator uses less power than a radio clock. The refrigerator used 2kw and it runs for 8 hours a day, the clock radio uses 1 watt for 24 hours. After making the proper calculations, this was proved wrong. The refrigerator uses more power than the clock radio.

P=W/t

W=Pt



Pr=2000w*8*3600

Pr=5.76x10^7J



Pc=1w*24*3600

Pc=86400J






SPRING
A spring with a mass was given an initial velocity and the spring started oscilating. The graphs of the spring oscilating was different for kinetic energy, gravitational energy, and force.
The graph for the force was linear (f=kx), the graphs for kinetic energy and gravitational energy were sinusodial (k=1/2mv^2). The sinusodial graphs had a constant pattern because the velocity was not changing significantly.

Lab
Kinetic Energy and Friction lab was done in class.

Announcements
Write up Kinetic Energy and Friction Lab or Kinetic Energy and Work (Due Friday)
Wednesday review for Midterm
Lab notebooks will be collected on Friday
Cart due on Monday Ocotber 4th