Physics 13 – Lecture 1
	Where did relativity come from?
	Review of Classical Motion
	On the shoulders of giants
	Relativity - inertial frames of reference
	Moving train and platform
	Relativity of motion
	Falling ball seen from platform
	Acceleration
	Galilean relativity
	Galilean relativity (cont’d)
	Galilean relativity & 2nd Law
	Lateral bouncing ball in 2 inertial frames
	Motion in a moving medium
	Swim time calculation
	Lateral swimmer
	Adding swimmer velocities
	Swimming lessons
	Laws of Physics are Invariant
	Electromagnetic waves

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