Circular Motion Practical 1 Analysis Graphs Plotting You

Circular Motion Practical 1 Analysis

Graphs - Plotting • You need to plot 2 graphs: v Vs r and v 2 Vs r. Put r on the x-axis of both graphs. Plot the data but don‘t draw in best fit lines yet! • *plot the graphs on 2 separate pieces of graph paper* Remember your rules for graphs: ØUse sensible scales (don’t go up in 3 s, 6 s, 7 s or 9 s), your plotted points must take up a minimum of 50% of the A 4 page…. it doesn’t count if your trim the edges! ØPlot your points accurately ØLabel the axis and give the graph a title

Graphs – Trend lines • When you have plotted each graph, look at the data and decide whether you should draw a line of best fit or a curve of best fit. • Curves should be drawn as one smooth line, you should not lift your pencil once you start drawing and you should not join dot to dot. • Lines of best fit should be on single, straight line drawn with a ruler. The points should be distributed evenly either side of the line. • Describe the relationship shown in each graph.

Graphs – Analysis • For your graph of v 2 Vs r, calculate the gradient of your line. • Find the maximum and minimum gradient using the box method. • Calculate the uncertainty in your gradient. • What does your gradient represent in terms of physical quantities?

Uncertainty Calculations • Calculate the maximum uncertainity in your raw data (radius and time) • Calculate the uncertainty in v 2. • Calculate the uncertainty in a.

Analysis • Are your results reliable? • To determine this, you should look at: • Repeat readings – do they agree? • Uncertainty in a – is it acceptable? • Are there any anomalies?

Conclusion • What did you find out in the experiment? This should be linked back to your hyphothesis.

Evaluation • What were limitations in your method? • How could errors have been introduced? • How could this be minimised?