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# The Moment Of Truth II

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### The Moment Of Truth II

1. 1. The Moment of Truth Forces Physics Semester I 2008-2009 Mrs. Kuzara
2. 2. Forces <ul><li>A ropes pulls up on a 10.0kg box with a force of 250N. What is the acceleration of the box? </li></ul><ul><ul><ul><li>15.2m/s 2 up </li></ul></ul></ul>
3. 3. Forces <ul><li>A 20N force is applied to a 5kg object. The object accelerates at 2m/s 2 . </li></ul><ul><ul><li>What is the force of friction? </li></ul></ul><ul><ul><ul><li>-10N </li></ul></ul></ul><ul><ul><li>What is the coefficient of friction? </li></ul></ul><ul><ul><ul><li>0.20 </li></ul></ul></ul>
4. 4. Forces & Work <ul><li>A 5.0kg box is pulled 10.0m right on a frictionless surface by a 25N force. </li></ul><ul><ul><li>How much work is done? </li></ul></ul><ul><ul><ul><li>250J </li></ul></ul></ul><ul><ul><li>If the box starts at rest, what is its final velocity? </li></ul></ul><ul><ul><ul><li>10m/s </li></ul></ul></ul>