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Newton’s Laws

Newton’s Laws. Newton’s First Law. An object moving at a constant velocity keeps moving at that velocity unless acted upon by an unbalanced net force. Newton’s First Law Continued…. An object at rest remains at rest unless acted upon by an unbalanced net force

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Newton’s Laws

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  1. Newton’s Laws

  2. Newton’s First Law • An object moving at a constant velocity keeps moving at that velocity unless acted upon by an unbalanced net force

  3. 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

  4. Newton’s Second Law • The acceleration of an object is in the same direction as the net force on the object

  5. 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

  6. 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

  7. 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

  8. Newton’s Third Law • “To every action force there is an equal and opposite reaction force”

  9. Action and Reaction • For every action there is an equal and opposite reaction.

  10. Action and Reaction Forces Don’t Cancel

  11. Momentum • Related to how much force is needed to change its motion p=mv p momentum (kg∙m/s) m  mass (kg) v  velocity (m/s)

  12. Law of Conservation of Momentum • The momentum of an object doesn’t change unless its mass, velocity, or both change

  13. Bill Nye - Momentum • http://www.youtube.com/watch?v=y2Gb4NIv0Xg

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