Forces &?Fields
Forces:
- Free Fall (Galileo --> Newton)
- Galileo: All bodies fall downward with the same acceleration
- Newton: F = m a + force of gravity near earth is Fg = m g
- Universal Gravitation ( Kepler --> Newton)
- Kepler: Described motion of planets T2 = k R3
- Newton: F = m a + Universal law of gravity Fm = G m1 m2 / R2
Conservation Laws:
- Conservation of Momentum:
- Newton’s 3rd & 2nd Laws ? total momentum (p=mv) of interacting objects is conserved (does not change in time).
- Conservation of Energy:
- Energy changes form but the total is always conserved
Fields: (Newton ==> Faraday ==> Maxwell)
- Electric Fields created by charges.
- Magnetic Fields created by charges in motion.
- Electromagnetic waves (speed = c)