CH5 - New office hours @ MAP 413 Mondays: 8:30 10:30 am...

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Unformatted text preview: New office hours @ MAP 413 Mondays: 8:30 10:30 am Fridays: 8:30 10:30 am 12:30 1:30 Pm 3:00 6:00 PM Saturday: 11:am 2:00 pm (confirm availability) And by appointment/email The Laws of motion The Laws of motion Reducing the amount of friction between the surface and the wheels allow skaters to go really fast. WHY? The Laws of motion Reducing the amount of friction between the surface and the wheels allow skaters to go really fast. WHY? An external (outside) force is what would affect the motion of the object The Laws of motion Particle or object will not accelerate unless some external Force acts on it The Laws of motion Gravitational Force The gravitational force, F g , is the force that the earth exerts on an object This force is directed toward the center of the earth Its magnitude is called the weight of the object Weight = | F g |= mg Newtons Second Law Chapter 5 The Laws of motion To prove Newtons second Law Newtons second law Newtons second law Chapter 5 The Laws of motion More About Newtons Second Law Newtons Second Law can be expressed in terms of components: F x = m a x F y = m a y F z = m a z Newtons Third Law Rockets are unable to accelerate in space because ... a. there is no air in space for the rockets to push off of. b. there is no gravity is in space. c. there is no air resistance in space. d. ... nonsense! Rockets do accelerate in space. Free Body Diagram In a free body diagram, you want the forces acting on a particular object The normal force and the force of gravity are the forces that act on the monitor Applications of Newtons Law Assumptions Objects can be modeled as particles Masses of strings or ropes are negligible When a rope attached to an object is pulling it, the magnitude of that force, T , is the tension in the rope Interested only in the external forces acting on the object can neglect reaction forces Initially dealing with frictionless surfaces Objects in Equilibrium If the acceleration of an object that can be modeled as a particle is zero, the object is said to be in equilibrium Mathematically, the net force acting on the object is zero 0 and x y F F F Equilibrium, Example 1...
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This note was uploaded on 10/21/2010 for the course PHY 2048 taught by Professor Bose during the Spring '08 term at University of Central Florida.

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CH5 - New office hours @ MAP 413 Mondays: 8:30 10:30 am...

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