lecture05_Jan26

lecture05_Jan26 - Chapter 5 Force and Motion Chapter In...

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Page Chapter 5. Force and Motion Chapter 5. Force and Motion In this chapter we study causes of motion: Why does the windsurfer blast across the water in the way he does? The combined forces of the wind, water, and gravity accelerate him according to the principles of dynamics. Chapter Goal: To establish a connection between force and motion. Agenda for Today Agenda for Today z Dynamics: why do objects move? z Force z Mass and Weight z Newton’s 3 laws of motion
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Page What causes acceleration? The story so far . .. The story so far . .. An action from “outside” an object that causes the object’s acceleration! interaction of an object with its environment Dynamics is the study of forces and the resulting motion But: • displacement • velocity • acceleration description of motion kinematics Introduce a new concept: FORCE What is a force? What is a force? z A force is a push or a pull on an object. z A force is a vector. It has both a magnitude and a direction. z A force requires an agent. Something does the pushing or pulling. z A force is either a contact force or a long- range force.
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Page A Tour de Force A Tour de Force z Contact Forces Í Normal force Í Spring force Í Tension force Í Friction Í Drag Í Thrust z Non-contact Forces (long-range forces) Í Gravity Í Electric force Í Magnetic force Í more Tactics: Drawing force vectors Tactics: Drawing force vectors
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Page A Tour de Force A Tour de Force Every object on earth experiences a downward force of mg . A Tour de Force A Tour de Force
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Page A Tour de Force A Tour de Force A Tour de Force A Tour de Force
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Page A Tour de Force A Tour de Force Typical Force Magnitudes Typical Force Magnitudes
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Page Newton Newton ’s Laws of Motion s Laws of Motion z Newton’s First Law : An object at rest will remain at rest, or an object that is moving will continue to move in a straight line with constant velocity, if
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This note was uploaded on 09/26/2010 for the course PHYS 021 taught by Professor Dick during the Spring '08 term at GWU.

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lecture05_Jan26 - Chapter 5 Force and Motion Chapter In...

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