Click on the image for a discussion of the definition of weight.
Mass or Weight?




2nd Law: ΣF = ma
3rd Law: F12 = F21 (interacting pair)



Net force determines a

Look for Third Law Pairs!




If the forces are equal and opposite why do the rifle and bullet accelerate?





Tug of War!

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BEYOND NEWTONIAN PHYSICS:

  • Electromagnetism (1860)

  • Special Relativity (1905)-- high speeds

  • General Relativity (1915)-- large mass

  • Quantum Physics (1925)-- small objects





  • FRICTION!
    Dark!