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# 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