Give me some background information on why this happens....
2006-08-30 21:49:22 · 6 answers · asked by Jonathan N 3 in Science & Mathematics ➔ Physics
More height means more velocity. because accelaration of free fall adds 9.8 meters per second of velocity every second it falls toward the water. so the higher the pencil drops the faster it gets.
2006-08-30 22:05:53 · answer #1 · answered by Kalooka 7 · 0⤊ 0⤋
When a pencil is dropped from a height h from the water surface, it gets a kinetic energy equal to ½ m v v. Its potential energy m g h is fully converted to kinetic energy.
mgh = ½ m v v.
Or gh = ½ v v
Or vv = 2gh.
or v = square root of ( 2gh)
Therefore when h is increased v is increased and hence the pencil penetrates more into the water before returning to water surface.
2006-08-31 00:01:30 · answer #2 · answered by Pearlsawme 7 · 0⤊ 0⤋
??? So easy ... because the pencil's velocity is higher, when being dropped from greater height. Due to greater velocity, the power of impact is higher, thus the penetration of the water will be a deeper one.
2006-08-30 22:06:24 · answer #3 · answered by jhstha 4 · 0⤊ 0⤋
Velocity
2006-08-30 21:57:04 · answer #4 · answered by MysticTortoise 3 · 0⤊ 0⤋
when it's dropping
v2 = v1 + at
where a = gravity
the longer it drops, the higher v2 is.
when it hits water
v3 = v2 - at
where a = deceleration due to viscosity of water
the higher v2 is, the longer it takes for v3 to get to 0.
and I flunked math
2006-08-30 22:06:27 · answer #5 · answered by Cyril L 1 · 0⤊ 0⤋
more height more potential engergy(mgh) of the pencil and more will be its penetration in water.
2006-08-30 22:11:18 · answer #6 · answered by CHIMPU 2 · 0⤊ 0⤋