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# Forces Concept1

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### Forces Concept1

1. 1. Force and Motion <ul><li>Mac was a lonely soccer ball. Mac sat for hours and often pondered about the forces keeping him at rest on the green soft grass of his soccer field. </li></ul>
2. 2. <ul><li>Mac decided there were at least three forces acting upon him to keep him still. </li></ul><ul><li>Can you name them? </li></ul>
3. 3. <ul><li>Correct! Air pressure, gravity, and the ground are all forces that keep him at rest. </li></ul><ul><li>The forces are balanced since the net force results in zero movement. </li></ul>
4. 4. <ul><li>One day, a kid walks up to Mac and kicks him 15 yards eastward! </li></ul><ul><li>The force of the kick is an unbalanced force and causes Mac to move. </li></ul>
5. 5. <ul><li>In flight, other unbalanced forces act upon Mac, that make him fall back to the ground and eventually comes to rest again. </li></ul><ul><li>Name at least two of these unbalanced forces. </li></ul>
6. 6. <ul><li>Correct! Friction (Air Resistance) and gravity act upon Mac, slowing him down, until he comes to rest. </li></ul>
7. 7. <ul><li>Once at rest, the original three balanced forces (what are they?) act upon Mac again to keep him at rest. </li></ul>
8. 8. <ul><li>Now the same kid comes up and kicks Mac once again, sending him into the air. However, this time a nearby cliff causing him to fall at at increasing speed. </li></ul>
9. 9. <ul><li>When mac hits the ground, another unbalanced force(the ground) acts upon him, slowing him down. </li></ul>
10. 10. <ul><li>Additional forces now act on Mac slowing him down even more. </li></ul><ul><li>What are two of these forces? </li></ul>
11. 11. <ul><li>Correct! Once again gravity and air resistance (friction) are unbalanced forces resulting in a change of speed. </li></ul>
12. 12. <ul><li>Eventually, these unbalanced forces cause Mac to slow down come to a rest. </li></ul>
13. 13. <ul><li>Once at rest, the original balanced forces(what are they?) act upon Mac to hold him still again. </li></ul>
14. 14. <ul><li>Until another unbalanced force causes him to move from his station in life. </li></ul>
15. 15. <ul><li>Morale: </li></ul><ul><li>Sometimes boredom is better than an unbalanced force. </li></ul>
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