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Dynamics

Learn about Newton's Second Law of Motion, the fundamental equation a=FNet/m, and its applications. Discover why objects accelerate when a force is applied and how this law helps in scenarios like truck vs. mosquito and Earth vs. marker.

chriswilson
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Dynamics

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  1. Dynamics Linear

  2. Newton’s Second Law • The acceleration of an object is directly proportional to Net Force applied to the object and inversely proportional to the mass of the object. The acceleration is always in the direction of the FNet. • a=FNet/m or FNet = ma • Single Most Important Equation in Physics

  3. Defining a Newton • Newton- The amount of force required to accelerate a 1 kg object at a rate of 1 m/s2. • Units: N = kg·m/s2

  4. Applying Newtons 2nd Law Truck and Mosquito Example:If according to Newton’s 3rd law that the force of the truck on the mosquito must equal the force of the mosquito on the truck, Why then does the mosquito get the worst of end of the deal?

  5. Applying Newtons 2nd Law • According to the 3rd Law • FMT = FTM • By Newton’s 2nd law then, • Mtruckatruck = mmosquitoamosquito

  6. Applying Newtons 2nd Law Earth and Marker Example:If according to Newton’s 3rd law that the force of the Earth on the marker must equal the force of the marker on the Earth, Why then do we not feel the Earth move upward when we drop the marker get the worst of end of the deal?

  7. Applying Newtons 2nd Law • According to the 3rd Law • FME = FEM • By Newton’s 2nd law then, • Mearthaearth = mmarkeramarker

  8. Applying Newtons 2nd Law • Applications • Accelerating a weight on a string upward • Vertical Jump • Cart going down a ramp • Frictionless • With tension

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