phys1441-spring08-022508-post

phys1441-spring08-022508-post - PHYS 1441 Section 002...

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Monday, Feb. 25, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 1 PHYS 1441 – Section 002 Lecture #10 Monday, Feb. 25, 2008 Dr. Jae hoon Yu Newton’s Laws of Motion –F o r c e Newton’s first law: Inertia & Mass Newton’s second law of motion Newton’s third law of motion Today’s homework is homework #5, due 9pm, Monday, Mar. 3!!
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Monday, Feb. 25, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 2 Announcements • Term exam grading half way done • Homework #4 due has been extended to 9pm Thursday, Feb. 28
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Monday, Feb. 25, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 3 Force We’ve been learning kinematics; describing motion without understanding what the cause of the motion is. Now we are going to learn dynamics!! Can someone tell me what FORCE is? FORCE is what causes an object to move. FORCEs are what cause changes to the velocity of an object!! The above statement is not entirely correct. Why? Because when an object is moving with a constant velocity no force is exerted on the object!!! What does this statement mean? When there is force, there is change of velocity!! What happens if there are several forces being exerted on an object? Forces are vector quantities, so vector sum of all forces, the NET FORCE, determines the direction of the acceleration of the object. F 1 F 2 NET FORCE, F= F 1 +F 2 When the net force on an object is 0, it has constant velocity and is at its equilibrium!! What does force cause? It causes an acceleration.!!
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Monday, Feb. 25, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 4 Newton’s First Law Aristotle (384-322BC): A natural state of a body is rest. Thus force is required to move an object. To move faster, ones needs larger forces.
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This note was uploaded on 10/21/2009 for the course PHYS phys1441 taught by Professor Dr.jhaehoonyou during the Spring '08 term at UT Arlington.

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phys1441-spring08-022508-post - PHYS 1441 Section 002...

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