**Class II**

- Review of previous class
- Solving simple formulas: the basic idea of algebra
- Powers of ten and "scientific notation"
- Quantities: Names and Units
- length, mass, time
- velocity and acceleration
- Force, work, and energy (joules)
- Power and energy: general, electrical (watts)
- Intensity

Quantity Name Quantity Units length meters (m), feet (ft), mile (mi) time second (s), hour (hr), year (yr) mass pound (lb), kilogram (kg), ton (t) velocity m/s, ft/s, mi/hr acceleration m/s ^{2}, ft/s^{2}Force = mass x acceleration Newton (N) = kg m/s ^{2}Work = Force x distance, Energy transferred = Work Done

Joule (J) = N x m = kg m ^{2}/s^{2}Power = Energy/Time Energy = Power x Time

^{ }watt (w) = J/sIntensity = Power / Area ^{ w/}m^{2}