Need some simple physics help.
This is embarrassing, I know. I asked all my friends and they didn't want to answer me because of how stupid this question was.. But here it goes:
Looking at this picture, there are 4 frames of the ball:
http://i.gyazo.com/b04b279d05606ace177bf3a761c61503.png
This picture was shot through a 30 frames / second camera.
How many seconds elapsed from the start to the top?
I think it's 2/15 seconds but my friend said to check my units and he sent me this:
http://www.purplemath.com/modules/fraction3.htm
-_-
I am so confused so if someone could help I would gladly appreciate it!
October 30, 2014
5 Comments • Newest first
Wow, thanks guys! I finally got through my assignment! <3 <3
frame time = 1/30 sec
and the stroboscope captured 4 "images" of the ball.
so the stroboscope flashed 4 times as the ball fell through the picture? (then you are right?)
My physics teacher once suggested doing this as a project/lab/ w/e in high school. It was to demonstrate linear momentum and 2d collisions... flash a stroboscope, let billiard balls collide, and take pictures. That's one way to measure movement.. if you're interested in this stuff lol
you're correct. your friends are just trolling/messing with you.
this is maths not physics, and u are correct 2/15 = 4/30 = 4 frames out of 30
no idea what ur friend is doing, u shouldnt be his friend he is influencing u to be bad at maths
Using dimensional analysis:
30 frames / second is the same as second / 30 frames.
Thus, 1 second / 30 frames = x seconds / 4 frames and x should equal 2/15. Your friend is incorrect.