Demonstration
v
= Final velocity
u= Initial velocity
a = Acceleration
t = Time.
d = Distance
d = ut + (1/2)at2
Lets use the above
formula for an entertaining demonstration
Hold a ten dollar note, or
if you dare a fifty dollar note, between the fingers of a person. Release
the note, without any warning. If they catch the note they can keep
it. The secret is to keep the top of the note about 7 cm above the
fingers of the person.
It takes approximately 0.143 seconds for the nerve impulses to travel
from the eye to the brain and into the muscles controlling the fingers.
Click to see a 100kb movie.
What is the distance traveled by the note in 0.143 seconds if it is
released from rest?
Use d = ut + 0.5at2
Where
u= initial speed = 0 (starts from rest)
t = 0.143 seconds
a = 9.8 m/s/s
d = 0.5 X 9.8 X (0.143)2 = 0.1m or 10cm
