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# Inertia 3

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### Inertia 3

1. 1. Inertia <ul><li>Is the tendency for an object to stay at rest </li></ul><ul><ul><li>More simply: The laziness of an object </li></ul></ul>
2. 2. Point 1 <ul><li>Inertia describes the tendency of an object to stay at rest or preserve its state of motion. </li></ul><ul><li>An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force. </li></ul>
3. 3. Point 2 <ul><li>Objects of larger mass have larger inertia and are harder to start moving. </li></ul><ul><li>Inertia- The tendency of an object to stay at rest. </li></ul><ul><li>Higher mass= Higher inertia. </li></ul>
4. 4. Point 3 <ul><li>Objects of smaller mass have less inertia and are easier to start moving. </li></ul><ul><li>Mass- The measure of the amount of “stuff” contained in an object. </li></ul><ul><li>Inertia- An objects resistance to change a change in motion. </li></ul>
5. 5. Example Problem <ul><li>A 1000 kg car is traveling at 5m/s and hits a concrete barrier. The driver’s mass is 75 kg and his passenger is 60kg. They are hurled forwards at a force of 600N, and both are stopped by the airbag. The force of the airbag is greater on which occupant. </li></ul><ul><ul><li>A) The Same </li></ul></ul><ul><ul><li>B) The Driver </li></ul></ul><ul><ul><li>C) The Passenger </li></ul></ul><ul><li>Note- you can not calculate inertia. </li></ul><ul><li>Answer- B The Driver. </li></ul>
6. 6. Example Problem <ul><li>A five kilogram box is moving across a surface at a constant velocity of 1 m/s what force must be applied to the box in order to keep it moving at a constant speed? The coefficient of friction between the box and the floor is 0.6 </li></ul><ul><li>Answer: 29.43N </li></ul>
7. 7. Newton's 1 st Law of Motion <ul><li>Also called the “Law of Inertia” </li></ul><ul><li>Version 1- An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force. </li></ul><ul><li>Version 2- If Fnet=0 then a=0 (v=constant) </li></ul>
8. 8. Point 4 <ul><li>If the Net force acting on an object is zero it will continue moving in a straight line at a constant speed. </li></ul><ul><li>Net Force= Fnet= Sum of all forces acting on an object. </li></ul><ul><li>IF Fnet=0 then acceleration=0 and velocity is constant. </li></ul>