01 Measurements

Useful website for sig. fig. : https://www.calculatorsoup.com/calculators/math/significant-figures-counter.php 

PhET vector addtion applet

Use "Explore 2D" and "Equations" to enhance your understanding of vector addition using diagram and resolving vectors into perpendicular components : https://phet.colorado.edu/en/simulation/vector-addition  

What is your reaction time?

Why do we record timings to 1 decimal place when the stopwatch reading is to 2 decimal places? This is because there is a human reaction time as you start and stop the stopwatch. On average, reaction time is between 0.1 to 0.3 s. In this experiment, the distance on the ruler scale when you catch the ruler can be converted into a timing by referring to this table. Why is that so? This is because the ruler is free falling and you can use kinematics equation to relate the distance fallen and time taken. 

Compare with your friends, do students who play sports or musical instruments have faster reaction times? Try the experiment on a variety of people of different ages. Whose reaction time is faster? Boys or girls? Adults or kids? Can you improve your reaction time by repeating the experiment several times daily? Practice for a week then test yourself again to see.