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Balanced and Unbalanced Forces


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Ms. Parker's notes on October 3, 2011 over free body diagrams and balanced/unbalanced forces.

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Balanced and Unbalanced Forces

  1. 1. <ul><li>What happens when an unbalanced force acts on an object? </li></ul><ul><ul><li>the object accelerates </li></ul></ul><ul><li>When two forces act on an object at the same time, the direction as well as the magnitude of the force determine the motion (including direction) of the object </li></ul>
  2. 2. <ul><li>If the two forces are in the same direction, the sum of the forces (net force) will cause a larger acceleration than either force on its own </li></ul>
  3. 3. <ul><li>If the two forces are in opposite directions then the net force could be zero – in which case there would be no acceleration </li></ul><ul><li>OR </li></ul><ul><li>the sum of the two forces will result in a net force in one direction </li></ul>
  4. 4. <ul><li>Draw a free body diagram that you think would represent two forces in opposite directions that would result in no net force (and thus, no acceleration) </li></ul>
  5. 5. <ul><li>Draw a free body diagram with two forces in opposite directions that would result in a net force (and acceleration) </li></ul>
  6. 6. <ul><li>It ’s really, really important to remember: </li></ul><ul><li>a net force results in acceleration </li></ul><ul><li>BUT </li></ul><ul><li>no net force does not mean no motion – an object will move at a constant speed in a straight line with no net force!!! </li></ul>
  7. 7. <ul><li>What if the forces aren ’t in line with each other? </li></ul>