nsta web seminar: force and motion: stop faking it!...dec 11, 2008 · the same as mass, but with...
TRANSCRIPT
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NSTA Web Seminar:
Force and Motion: Stop Faking It!
LIVE INTERACTIVE LEARNING @ YOUR DESKTOP
Thursday, December 11, 2008
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Force and MotionForce and MotionSpeed and velocity
Inertia and acceleration
Newton’s second law
Mass and weight
Speed and velocity
Inertia and acceleration
Newton’s second law
Mass and weight
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Speed and velocity
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Which animal had the greatest average speed for the entire race?
Tortoise Hare
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Which animal had the greatest instantaneous speed during the race?
Tortoise Hare
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Definitions
Average
Instantaneous speed = speed calculated over an infinitesimally
small time period
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Which of the following is true?
All the balls moved exactly alike.
All the balls moved with the same speed.
All the balls were the same color.
They weren’t really balls, it’s a computer simulation.
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Let’s Pause for Two Questions from the
Audience
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Inertia and Acceleration
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Inertia = the tendency of an object to keep on doing whatever it is doing, whether in motion at a
constant speed or at rest
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Acceleration = any change in speed and/or direction
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Let’s Pause for Two Questions from the
Audience
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Newton’s second law
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Mass is a measure of inertia. It’s just a number used to
compare inertias.
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Newton’s second law
ΣF = ma
ΣF represents the net force acting on an object.
m represents the mass of an object, which is a numerical measure of its inertia.
a represents the acceleration of the object.
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Let’s Pause for Two Questions from the
Audience
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Mass and Weight
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Mass is:Something you go to if you are Catholic.
The amount of “stuff” in an object.
A measure of an object’s inertia.
A force that resists motion.
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Weight is:The gravitational force the Earth exerts on an object.
The gravitational force any object exerts on another object.
The same as mass, but with different units.
A good song by The Band
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• Mass is a measure of inertia. It is the m that goes into F = ma.
• Weight is the force that gravity exerts on something. Weight is the F in F = ma.
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The accelerations of the two objects are the same
For the large object:F = ma
Weight of large object = (mass of large object)(acceleration of large object)
W = mg
For the small object:
F = maWeight of small object = (mass of small object)(acceleration of small object)
w = mg
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Fgrav =Gm1m2
r2
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For an object near the surface of the Earth:
F = maGmEarthmobject
rEarth2 = mobjectaobject
GmEarth mobject
rEarth2 = mobject aobject
GmEarth
rEarth2 = aobject
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Thank you!
Let’s Pause for Two Questions from the
Audience
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Thanks to our presenter, Dr. Bill Robertson, and
to NSTA Press for sponsoring this program
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http://www.elluminate.com
g
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http://learningcenter.nsta.org
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• NASA: Discover the Universe – From Galileo to Today
December 16, 2008
• NSTA Press: Picture-Perfect Science Lessons
December 17, 2008
• FDA: Teach Science Concepts and Inquiry with Food
December 18, 2008
http://learningcenter.nsta.org
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National Science Teachers AssociationDr. Francis Q. Eberle, Executive Director
Zipporah Miller, Associate Executive Director Conferences and Programs
Al Byers, Assistant Executive Director e-Learning
LIVE INTERACTIVE LEARNING @ YOUR DESKTOP
NSTA Web SeminarsFlavio Mendez, Senior Director
Jeff Layman, Technical Coordinator