Newton’s Laws
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Transcript of Newton’s Laws
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Newton’s Laws
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Newton’s First Law
• An object moving at a constant velocity keeps moving at that velocity unless acted upon by an unbalanced net force
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Newton’s First Law Continued…
• An object at rest remains at rest unless acted upon by an unbalanced net force
• How does a seatbelt relate to Newton’s First Law?
• http://www.youtube.com/watch?v=4NQbeZ0EXZQ&list=PL0CDAF675CAEE090B&index=8
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Newton’s Second Law
• The acceleration of an object is in the same direction as the net force on the object
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Force• Force = Mass x Acceleration• F=ma• Force is measured in Newtons (N)• You push a friend sitting on a swing. She has
a mass of 50 kg and accelerates at a rate of 4 m/s2. Find the force you exerted.
F = 50kg x 4 m/s2 =
F = 200 N
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Force Videos• FSN Force - http://www.youtube.com/watch?v=A_wnt84iyMk
• NFL Impact - http://www.wired.com/wiredscience/2010/11/espn-sport-science-on-collisions-video-break-down
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Centripetal Force• The net force exerted toward
the center of a curved path
• Ex: Bucket of Water,
Earth and Moon
• http://www.youtube.com/watch?v=bWiVv--OTYA
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Newton’s Third Law• “To every action force there is
an equal and opposite reaction force”
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Action and Reaction• For every action there is an
equal and opposite reaction.
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Action and Reaction Forces Don’t Cancel
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Momentum• Related to how much force is
needed to change its motion
p=mvp momentum (kg∙m/s)
m mass (kg)
v velocity (m/s)
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Law of Conservation of Momentum
• The momentum of an object doesn’t change unless its mass, velocity, or both change
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• Bill Nye - Momentum
– http://www.youtube.com/watch?v=y2Gb4NIv0Xg