PHY 101 Lecture Notes - Lecture 1: Contact Force, Electromagnetism, Classical Mechanics
Document Summary
First law: an object in motion stays in motion unless acted on by an outside in uence. An object at rest stays at rest unless acted on by an outside in uence. Outside in uences can also include gravity and air resistance force. Inertia- the tendency to resist changes in motion (from movement/ from stillness) Ex: if a moving car runs into a brick wall, the car will be stopped, but the passenger will not be stopped. This is because the passenger"s inertia resists the change in motion since there is no object to stop it. To describe motion you need 3 measurements and 3 directions. Position is an example of a vector quantity because it consists of magnitude and direction. Position: measured in meters, tells where an object is right now. Velocity: measured in meters/ second, tells how fast an object is moving and in which direction.
