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from Lecture-Demonstration Now on a two-DVD set: The classic four-hour video collection: Demonstrations in Acoustics for only $20. $10 discount for direct cash sales. Inquire in front after program. Dr. Richard E. Berg, demonstrating over 70 experiments, in 29 titled segments, covering vibrations, waves and sound.

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Energy and Motion Physics is Phun March 2009

Topics: Center of Mass Newton’s Laws Mechanical Energy

Center of Mass Properties Mass “acts” at CM CM stable at lowest point Center of Mass Demos CM location CM motion

Center of Percussion “Dynamic” CM Baseball bat example Tennis racket

Kinematics and Dynamics

Newton’s Laws of Motion

Newton’s First Law a. An object at rest tends. to remain at rest. b Newton’s First Law a. An object at rest tends to remain at rest. b. An object in motion tends to remain in motion in a straight line with a constant speed.

Newton’s First Law a. An object at rest tends to remain at rest.

Newton’s First Law b. An object in motion tends. to remain in motion Newton’s First Law b. An object in motion tends to remain in motion in a straight line with a constant speed.

Test Question: Masses hanging in series

Forces and Impulse

Funnel Cart

Leaning Tower of Pisa

Newton’s Second Law F = m a or a = F/m where F is the force, m is the mass, and a is the acceleration

Newton’s Third Law For every action there is an equal and opposite reaction.

Rocketry

Test Question: The Fan Cart

Conservation of Mechanical Energy

The Hill Track

Giant Pendulum

The End See you in May! We are on the web at http://www.physics.umd.edu/lecdem/ Animated Gifs compliments of bellsnwhistles.com