Phys2A_F07_Lecture_11a

# Phys2A_F07_Lecture_11a - Force and Motion What is a force...

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W. P. Beyermann Fall 2007 1 Force and Motion • What is a force, and how do you identify all the forces acting on an object (i.e., the force body diagram)? • An object’s acceleration is proportional to the net force acting on the object (i.e., Newton’s 1st and 2nd laws – the cause of motion). The proportionality constant is the object’s mass.

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W. P. Beyermann Fall 2007 2 The Greeks – What causes an object to move?
W. P. Beyermann Fall 2007 3 The answer came ~2000 years later when Newton annunciated his 1 st law. An object that is at rest will remain at rest, or an object that is moving will continue to move in a straight line with constant velocity, if and only if the net force acting on the object is zero. A force is something that causes an object to change its velocity, and no cause is needed for an object to move! In a sense, the 1 st law tells us what a force is. Newton’s 1 st Law

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W. P. Beyermann Fall 2007 4
Fall 2007 5 Attributes of Forces Forces are either contact forces (a push or pull on an object) or long-range forces (i.e., field forces). The only long-range force that we will deal with in this course is gravity. Contact Forces

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## This note was uploaded on 04/07/2008 for the course PHY 2A taught by Professor Beyermann during the Fall '08 term at UC Riverside.

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Phys2A_F07_Lecture_11a - Force and Motion What is a force...

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