AST-0009 Lecture Notes - Lecture 3: Hockey Puck
12 Mar 2016
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Formulated three laws of motion and the law of gravitation describe the motion of our physical world. Rationalize and enhance kepler"s laws: first law. A body remains at rest or moves in a straight at a constant speed unless acted upon by an outside (net) force. A rocket will coast in space along a straight line at constant speed. A hockey puck glides across the ice at constant speed until it hits something: second law. Acceleration is the rate of change in velocity, or how quickly motion is changing (in amount or direction: third law. Whenever one body exerts a force on a second body, the second body exerts an equal and opposite force on the irst body. Don"t need a rocket launch pad: universal law of gravitation. To bodies attract each other with a force that is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them.
