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# Newton’s 1st law of motion

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### Newton’s 1st law of motion

1. 1. Newton’s Laws of Motion
2. 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>
3. 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>
4. 5. Friction!
5. 6. <ul><li>Without friction (OR gravity!) all things would continue to move in a straight line at a constant velocity! </li></ul>
6. 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
7. 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
8. 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
9. 10. Balanced vs. Unbalanced Forces!
10. 11. Balance & Net Force??? <ul><li>Unbalanced Net Force </li></ul><ul><li>Balanced F net = 0 </li></ul>
11. 12. Balanced Forces & Motion
12. 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>
13. 14. Speeding up!
14. 15. Slowing down!!!
15. 16. Constant Velocity