physics 12

• all 2D motion can be resolved into vertical and horizontal components
• Momentum is conserved in an isolated system
• inelastic collision does not conserve kinetic energy
• elastic collisions conserve kinetic energy
• Kepler's first law: All planets move in elliptical orbits with the Sun at one focus
• Kepler's second law: A line that connects a planet to the Sun sweeps out equal areas in equal times
• geostationary satellites orbit around the earth at the same speed as the earth rotates, thus remaining above the same point
• low altitude polar satellites take high quality photographs but are not stationary to a surface point.
• the speed of light has the same value in all reference frames (second postulate)
• Lorentz factor connects proper measurements to relativistic measurements
• proper measurements have a nought subscript
• light photons do not experience time