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# Force

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### Transcript

• 1. Section 2 Force
• 2. Force – push or pull <ul><li>a force always acts in a certain direction </li></ul><ul><ul><li>ex. if you push something, the force is in the direction of the push </li></ul></ul>
• 3. Forces in Nature <ul><li>Electric force </li></ul><ul><ul><li>ex. lightning </li></ul></ul><ul><li>Magnetic force </li></ul><ul><ul><li>ex. magnetic poles </li></ul></ul>
• 4. <ul><li>Weight is a force </li></ul>
• 5. Newton <ul><li>Unit used for force (N) </li></ul>
• 6. Net force <ul><li>The combination of all the forces acting on an object. </li></ul><ul><li>How do you determine the net force of an object if all forces act on the same direction. </li></ul><ul><li>The answer depends on the directions of the forces </li></ul>
• 7. Ballanced and unbalanced forces <ul><li>When the forces on an object produce a net force of 0 N, the forces are balanced. </li></ul><ul><li>Balanced forces do not cause a nonmoving object to start moving. </li></ul><ul><li>When the net force on an object is NOT 0 N, the forces on the object are unbalanced. </li></ul><ul><li>Unbalanced forces are necessary to cause a nonmoving object to strat moving. </li></ul>
• 8. What is friction? <ul><li>Friction </li></ul><ul><ul><li>force that opposes the motion of an object </li></ul></ul><ul><ul><ul><li>the force of friction works in the opposite direction of the force of motion </li></ul></ul></ul>
• 9. Friction occurs because the surface of any object is rough <ul><li>The amount of friction between two surfaces depends on many factors. </li></ul><ul><li>Two factors include the force pushing the surfaces together and the roughness of the surfaces. </li></ul>
• 10. Types of Friction <ul><li>Kinetic Friction </li></ul><ul><ul><li>The word kinetic means “moving” , friction between moving surfaces </li></ul></ul><ul><ul><li>In which of the two pictures friction is smaller? </li></ul></ul>
• 11. Static Friction <ul><ul><li>When a force is applied to an object but does no cause the object to move. </li></ul></ul><ul><ul><li>The word static means ………. </li></ul></ul>
• 12. CLASSWORK <ul><li>IN YOUR OWN WORDS, WRITE A DEFINITION FOR THE TERMS FRICTION AND FORCE. </li></ul><ul><li>LIST THREE FORCES YOU EXCERT WHEN RIDING A BICYCLE. </li></ul><ul><li>EXPLAIN HOW FRICTION CAN BE HARMFUL AND HELPFUL. </li></ul><ul><li>EXPLAIN WHY FRICTION OCCURS. </li></ul><ul><li>NAME TWO WAYS IN WHICH FRICTION CAN BE INCREASED. </li></ul><ul><li>LIST THREE COMMON LUBRICANTS. </li></ul><ul><li>NAME SOME WAYS TO REDUCE FRICTION. </li></ul><ul><li>MAKE AN ILLUSTRATION EXPLAINING WHAT KIND OF FRICTION IS BEING APPLIED. </li></ul>
• 13. <ul><li>THANK YOU </li></ul>