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Verifying Newton's Second Law (force against acceleration graph) watch

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    Hi there all!
    I had practical on the above title using a trolley with masses. The trolley moved along the ramp when air blower is turned on and when masses are hanged on the weight hanger.Each time experiment was repeated, 20 g weight was added. Before the experiment, the total moving mass (trolley,piece of cards, weights) and the length of the card were measured.(my 1st question. why?)

    Its initial velocity, final velocity, time and acceleration were calculated using data logger from the info retrieved from light gate and interrupter card.
    All frictional forces were removed using air blower

    We were asked to draw a graph (force against acceleration) and then we were asked to calculate the total moving mass using the graph. My 2nd question is how? Wouldn't the gradient give the mass of only weights added?

    Very grateful for all your support through suggestions, answers and opinions!
 
 
 
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