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# Forces and motion

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Introduction

PHYSICS INVESTIGATION How the increase of height affects speed through a certain point Aim In this investigation I aim to investigate how an increase of a height of a surface affects the speed (velocity) of an animate object through a point. Strategy Equipment: Dynamics trolley, Plank, Meter ruler, QED, clamp, stand, light gate, and a piece of card I first set up the equipment which consisted of- QED ( quick electronic display) and light gate, 2 stands set up as 'rugby posts' with a metal rod in the middle to alter the height easily. I then used a ramp to put the trolley on and set the QED and light gate at the bottom to get the most accurate reading. ...read more.

Middle

that I could get an average of the 3 and, so if there was an outlier I could use the other readings as an average. The reading in red was an outlier it could have been of us setting that reading up wrong or could have been us letting the trolley off from the wrong distance, therefore it gained more speed than the other times. We had one 2 dependant variables, the distance and the height because we controlled each of them during the experiment. The equation to find the average is you add up the 3 reading and then divide by 3. ...read more.

Conclusion

If we used a machine there still would have been a chance of mechanical error. Our results show use that we did a fair and well conducted experiment it also shows us that we were consistent, except the when the QED showed us that we have a speed of 19.531. this could have been human error or a fault with the QED and light gate. To improve the experiment we could have used a machine to adjust the height because there could have been a error of 0.1cm. The error bar shows this on the graph. A machine would have been programmed to do it accurately. This is caused by human error. JAMES WILLANS Page 1 22/02/2009 ...read more.

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