Notes

Outline

Leonard Bernstein Chichester Psalms

Outline Force Pressure Work Energy Potential Energy Kinetic Energy Transformations and Conservation of Energy Heat

Force  A push or pull  Force = F  Exerted by contact or at a distance  Units = Newtons = N  Weight = force of gravity

Newton’s Third Law  For every force there is an equal but opposite reaction force. Equal Magnitude Opposite direction Acts back on the “causing” object

Pressure  Pressure = p  Force = F  Surface area = S p = F/S  (N/m2)

Atmospheric Pressure  Pressure = 1 x 105 N/m2  = 1 atmosphere = 1 atm  = 14.7 lbs./in2

Relative Pressure or Gauge Pressure  Pressure above atmospheric pressure  Absolute Pressure = Gauge pressure + 1 atm

Work  Work = Force x Displacement  Work = F x d = Fd  Units = Nm2 = joule

Energy  The ability of an object to do work as a result of its motion or relative position

Types of Energy  Kinetic Energy Energy of motion  Potential Energy Energy of relative position

Conservation of Energy  Energy can never be created or destroyed.  It can only be changed from one form to another.

Damped Motion  Friction - rubbing or contact  Heat is a form of energy  Heat removes energy from a system

Slide 13

Slide 14