Newton’s 1st law of motion
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  • 1. Newton’s Laws of Motion
  • 2. I. Newton’s First Law
    • A. Also called, the law of inertia .
    • B. Every object continues in a state of rest, or at a constant speed in a straight line unless acted on by an unbalanced , or a net force
  • 3.  
  • 4. 2. Why do things stop???
    • Friction – the force that resists the motion, or attempted motion, between objects in contact.
    • Friction is the net force that changes an object’s motion.
  • 5. Friction!
  • 6.
    • Without friction (OR gravity!) all things would continue to move in a straight line at a constant velocity!
  • 7. C. Net force (unbalanced forces!)
    • When more than one force acts on an object, the net force is the sum of all the forces.
    5N 10N 15N
  • 8. C. Net force (unbalanced forces!!)
    • When opposing forces cancel each other out, the net force is zero
    5N 5N Net Force = 0
  • 9.
    • If the forces do not cancel out, then you do have a net force!
    C. Net force (unbalanced forces!!) 10N 5N Net Force = 5N
  • 10. Balanced vs. Unbalanced Forces!
  • 11. Balance & Net Force???
    • Unbalanced Net Force
    • Balanced F net = 0
  • 12. Balanced Forces & Motion
  • 13. Unbalanced Forces & Motion
    • Change in velocity
    • Acceleration
    • Net Force!
    • Unbalanced Force
  • 14. Speeding up!
  • 15. Slowing down!!!
  • 16. Constant Velocity