Question

You will measure the speed of a thump. Our thump will be made with your index finger, but many methods of thumping something are possible. You may use any method to deliver the thump: a pencil, a spring, a rubber band stretched between two fingers, but the thump must be made horizontally. We could use the fact that speed, vstance but because of the speeds and distances available at home, we cannot easily measure the time of movement, which is typically <1s. Our reaction time (see previous experiments) would be a significant fraction of this time, so our results will not be reliable because we will not be able to measure the time reliably. We will instead use the drop time of our projectile from a distance H to constrain the distance traveled, X Use your knowledge of kinematic equations to determine the drop time of a projectile launched horizontally. Take a projectile launched horizontally at speed v. If the projectile is launched from a height H, what is the fall time of the projectile in terms of H and g? Show your work below. Take a projectile launched horizontally at speed. If the projectile travels a distance X in time t, its speed is given by v (note there is no acceleration in the horizontal direction). Using the time found above, determine the speed of the projectile (launched horizontally from a height H) in terms of X, H, and g. Show your work below. 1 Select a projectile and a horizontal platform to launch your projectile. Determine your method of thumping and describe it below.

Answer 1