Wave-Particle Duality

Discuss: How does the interference of water waves differ from the interference of electrons? How are they analogous?

Physics Notes Week #3 Definitions Force – a push or a pull (F) o Can’t see it, only the effect of it Net Force – the vector sum of all the forces acting on an object (EF or Fnet) o E is the Greek symbol sigma which means “sum of” st 1 Law of Motion (Law of Inertia) An object at rest stays at rest unless acted on by a net (or unbalanced) force An object in motion stays in motion at constant velocity unless acted on by a net force The mass of an object is a measure of the size of the inertia of an object (scalar quality) 2nd Law of Motion Tells what happens when there is a net force o where net force does not equal zero From experiments we find that: o a is directly proportional to sum of force o a is inversely proportional to mass And the second law of motion says that a=EF/m o Note: a and F are in bold type and are vectors! We usually write: EF = ma or using components we put in x or y F = ma is WRONG Newton Not the person the unit Amount of force required to accelerate 1 kg at 1 m/s^2 10N is about ¼ of a pound Weight Weight (W) is the force of gravity on an object Your weight (at sea level) is the force of gravity on you Close to the surface of the Earth, where the gravitational force is nearly constant, the weight is W = mg Note: mass and weight are not the same quantity but they are