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

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