Name: Phy 101 Chapter 3 Activity: Projectile Motion Requires a golf ball, a stop

Question

Name: Phy 101 Chapter 3 Activity: Projectile Motion Requires a golf ball, a stop watch and a friend to help you. 1) Throw a small ball (best a golf ball) straight upward as hard as you can. Your friend can measure the time of flight of the ball using a stop watch. Find the initial speed of your throw and the approximate maximum height of the ball solely with the use of the measured time. Please write here the equations you are using: Trial 1 Trial 2 Trial 3 Trial 4 Trail 5 max 2) What happens when you throw the ball at some angle other than 90 Does this change the time of flight? Explain. Can you still determine the maximum height and the initial speed? Explain.

Explanation / Answer

1) when ball is thrown straight upwards with speed u.

then at maximum height, speed of ball will be zero.

using v^2 - u^2 = 2aH

0^2 - u^2 = 2 * -9.81*H

H = u^2 / 2g Or u^2 / 2(9.81) = u^2 / 19.62 .......(i)

for time. v =u +at

0 = u -gt

t = u/g or u/9.81 .....(ii)

from (i) and (ii) , we can find Hmax, t and v0. (here v0 is u)

2)when ball is thrown at angle @ other 90 than time will change.

time will be t = (2 v0 sin@) / g

and Hmax = (v0)^2 ( sin@)^2 / 2g

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