Help 18 | Physics homework help
2. Time
· Estimate a 30-s time period while someone else times you using a stopwatch. (If you do not have a partner, you can do this experiment by closing your eyes; start the stopwatch and stop it when you think 30 s have elapsed.) · Record the actual time of your estimate. · Calculate the percent error of the estimate from the actual time. · In this exercise you will use your hand, a ruler or a measuring tape to measure lengths of objects. You will then compare the precision of these different methods. Hand width (Measurement of your hand span) ________ cm_______ m
- hand units x hand width
- In this exercise you will use a stop watch (phone) and different cues to measure time.
· Measure a vertical height of 2 m from the floor up. · Stand on a chair and hold a ball (marble) at the marked height in one hand and the stopwatch in the other hand. · Start your stopwatch at the same instant you release the object and stop the timer when you see the object hit the floor. · Repeat three times and calculate the average. **Ask one of your family member or a friend to help you for the next part. · Let your Family member time you while you drop the ball – use verbal commands like “start” or “now” to synchronize the dropping and timing. · Repeat 3 times, find the average drop time of the object.
- In Data table 5 include your measurements of round shaped objects around the house using string, ruler or meter tape
- At least 4 different round objects.
Graphing data and calculation of π based on the values from Data Table 5 · The relationship between the circumference and the diameter of a circle is: C= π D · Plot C vs D, C- circumference on the Y axis and D- diameter on X axis and include it here . [All Graphs should be on Graphing Paper or EXCEL] ***Please pay attention the graph should be a line; use “best fit line” do not simply connect the points. Watch the video posted on ecampus if you are using EXCEL