Newtons 2nd law of motion[1]

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Investigating Newton's 2nd Law

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Newtons 2nd law of motion[1]

  1. 1. Newton’s Laws of Motion Overview
  2. 2. Background Sir Isaac Newton (1643-1727) an English scientist and mathematician famous for his discovery of the law of gravity also discovered the three laws of motion. Today these laws are known as Newton’s Laws of Motion and describe the motion of all objects on the scale we experience in our everyday lives.
  3. 3. Definitions: Newton’s First Law: Objects in motion tend to stay in motion and objects at rest tend to stay at rest unless acted upon by an unbalanced force. Newton’s Second Law: Force equals mass times acceleration (F = ma). Newton’s Third Law: For every action there is an equal and opposite reaction.
  4. 4. Newton’s Second Law Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed. F = ma Force = MASS times ACCELERATION
  5. 5. 22ndnd LawLaw The net force of an object isThe net force of an object is equal to the product of itsequal to the product of its mass and acceleration, ormass and acceleration, or F=ma.F=ma.
  6. 6. 22ndnd LawLaw
  7. 7. 22ndnd LawLaw When mass is in kilograms andWhen mass is in kilograms and acceleration is in m/s/s, the unit of force isacceleration is in m/s/s, the unit of force is in newtons (N).in newtons (N). One newton is equal to the force requiredOne newton is equal to the force required to accelerate one kilogram of mass at oneto accelerate one kilogram of mass at one meter/second/second.meter/second/second.
  8. 8. Newton’s 2nd Law proves that different masses accelerate to the earth at the same rate, but with different forces.  We know that objects with different masses accelerate to the ground at the same rate.  However, because of the 2nd Law we know that they don’t hit the ground with the same force. F = maF = ma 98 N = 10 kg x 9.8 m/s/s98 N = 10 kg x 9.8 m/s/s F = maF = ma 9.8 N = 1 kg x 9.89.8 N = 1 kg x 9.8 m/s/sm/s/s
  9. 9. 5.2 The Second Law: Force, Mass, and Acceleration Investigation Key Question: What is the relationship between force, mass, and acceleration?
  10. 10. 5.2 The Second Law: Force, Mass, and Acceleration Investigation Key Question: What is the relationship between force, mass, and acceleration?

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