What was the work done by the suspended weight when the car (a) moved up the inc

Question

What was the work done by the suspended weight when the car (a) moved up the incline and (b) moved down the inclinc? (Show your calculations.) 2. What was the work done by gravity acting on the car when it (a) moved up the incline and (h) moved down the incline? (Show your calculations.) 3. (a) For the car going up the incline. what percentage of the work done by the suspended weight was lost to friction? (b) For the car moving down the incline. what percentage of the work done by gravity was lost to friction? (Show your calculations.)

Explanation / Answer

1)   a) car moving up plane , work done = m * g * sin30 * x   = 4.9 * m * x

           car moving up plane , work done = m * g * sin45 * x   = 6.93 * m * x

      b)   car moving down plane , work done = - m * g * sin30 * x   = 4.9 * m * x

             car moving down plane , work done = - m * g * sin45 * x   = 6.93 * m * x

2)    a) car moving up plane , work done = M * g * sin30 * x   = 4.9 * M * x

           car moving up plane , work done = M * g * sin45 * x   = 6.93 * M * x

      b)   car moving down plane , work done = - M * g * sin30 * x   = 4.9 * M * x

             car moving down plane , work done = - M * g * sin45 * x   = 6.93 * M * x

3) a) % work done lost to friction =   * cos45/sin45 =   * 100 %

       b)   % work done lost to friction =   * cos45/sin45 =   * 100 %

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