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Investigate the F=MA rule and establish links between acceleration, force and mass and how they affect each other.

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Introduction

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Aim: _                My aim is to investigate the F=MA rule and establish links between acceleration, force and mass and how                 they affect each other.

Prediction:        I predict that the acceleration will be effected by the mass and other factors like friction and                         aerodynamics. The force will be affected by mass, but in this experiment we need to find the                         acceleration, the formula can be re-arranged to read a=f/m.

Theory:                In this investigation I intend to look at three factors

                1. Shape or Size

                2. Speed in a straight line

                3. Direction

                Forces are measured in Newtons (N) named after the person who invented it, Sir Isaac Newton. When                 several forces act on an object they can either combined to make an overall force, which will change the                 objects shape or motion, or they could cancel each other out giving no overall force. In the last case the                 overall forces are balanced. If there is no force acting, or if all forces acting on an object are balanced,                 then there will be no change taking place. An object at rest will remain at rest. And a moving object will                 continue to move, keeping the same speed and travelling in the same direction.

                The mass of an object tells us how much matter it contains and is measured in the units of kilograms (kg).

                Acceleration is the rate at which the velocity of an object changes over a period of time. It is measured in                 metres-per-second per second (m/s/s)

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Middle

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Apparatus:        Margerine tub

                Plastercine

                Newton Meter

                Stool

                2 Rubber Bands

                Metre Ruler

                Chalk/Floor Marker

                Stopwatch

                Power Pack

                Ticker Timer

                Ticker Timer Tape

                Weighing Scales

Method:

                • Collect apparatus

                • Place margarine tub and plastercine on weighing scales and record result.

                • Link the two rubber bands together, like so:

                • Put the two ends of the combined rubber bands underneath the legs of the stool, like so:

                • With a Newton Meter pull the rubber band under the stool and every Newton the rubber band is being                 pulled mark on the floor where each Newton pulls the rubber band. Pull from the middle of the two                 rubber bands on the join so that it is approximately in the middle. You should get around ten Newtons                 marked on the floor depending on the strength and the amount of ‘stretch’ the rubber band has.

                • Mark on the floor in front of the stool every 10cm or so to give you rough range of how far the                         margarine tub will travel.

                • Place your weighed margarine tub with plastercine on the floor in front of the rubber band and pull back                 on the rubber band so that the back of the margarine tub is on the 1N mark and then release and                         simultaneously you must start the stopwatch and stop as soon as the margarine tub stops. Record your                 results. You can either measured from the front

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Conclusion

Evaluation:        My results were not very accurate. I know this because in the table above, if my knowledge serves me                 correctly, Mm/s2=N, if so  the Actual Force column should be the same as the Newtons column, of which it                 is not. But as the two columns are or such vast differences I am led to believe that the mentioned equation                 is untrue and I am unsure of what F may represents. It maybe just that I have miscalculated, or maybe my                 response times in stopping or starting the stopwatch was too slow I don’t know. If I had more time it                 would be wise to re-conduct the experiment. Maybe then the stopwatch being replace with laser beams                 as we have used them before I think it would be very accurate for timing the margarine tub with. Also                 because the results are not accurate I cannot establish a link between acceleration, force and mass and                 how they affect each other. So therefore I feel I have failed what I set out to do.

Ian speirs 10e2

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