English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

Which is the correct equation for contact force, such as a Karate blow...

2006-06-25 02:56:26 · 12 answers · asked by jack 7 in Science & Mathematics Physics

12 answers

the second equation

2006-06-25 02:59:58 · answer #1 · answered by Frankie 3 · 2 15

Force =ma
Momentum =mv
Kinetic Energy =1/2mv^2

2013-11-13 11:33:17 · answer #2 · answered by EL 2 · 3 0

24

2016-03-16 22:43:20 · answer #3 · answered by ? 4 · 0 1

Since

f=ma

for a mass m accelerating at a, then assuming an ideal system, we can set the impact force as,

f=m(dv/dt)

for a time interval dt.

For example, a 1 kg mass moving at 500 m/s that hits a 'perfect' steel wall where it uniformly decelerates from 500 m/s to 0 m/s in .02 seconds, has an approximate impact force of 25000 N. Thus, a body which decelerates more quickly has a greater effective impact than one which decelerates more slowly.

2006-06-25 13:14:59 · answer #4 · answered by James E 4 · 1 1

This Site Might Help You.

RE:
F=1/2mv2 or F=mv2?
Which is the correct equation for contact force, such as a Karate blow...

2015-08-17 02:25:03 · answer #5 · answered by Anonymous · 0 0

Differential equation for force F is:

F = d(m * v) / dt

If the mass is a constant and using the definition of acceleration a as the change in velocity with time, the second law reduces to the more familiar product of a mass and an acceleration:

F = m * a

Since acceleration is a change in velocity with a change in time t, we can also write this equation in the third form shown on the slide:

F = m * (v1 - v0) / (t1 - t0)

2006-06-25 03:01:58 · answer #6 · answered by hmc121667 3 · 2 1

F= m*a, E= 1/2mv2 You may want to think of energy as the ability to do work i.e. Force X Distance. If you're asking about a Karate blow, it would seem you want the second equation.
For instance, the energy a bullet imparts upon impact may be measured in ft-lbs.

2006-06-25 04:35:28 · answer #7 · answered by tom d 2 · 0 2

Neither is right. 1/2* mv^2 is an expression for energy. mv^2 is an expression for momentum. I"m guessing that all you're looking for is F=ma, where F=force, m=mass, a=acceleration.

2006-06-26 14:16:51 · answer #8 · answered by Rachel P 2 · 1 2

neither. its E=1/2 mv2

2006-06-26 02:39:44 · answer #9 · answered by Anonymous · 2 1

F refers force; ½ mvv or mvv refers energy.

Therefore both equations are wrong. The force x displacement gives the total work done or kinetic energy in this case; it is equal to ½ mvv and not mvv.

2006-06-25 03:54:36 · answer #10 · answered by Pearlsawme 7 · 4 1

force(kinetic energy in this case)=1/2mass*velocity

hope that helps

2006-06-25 03:07:25 · answer #11 · answered by jasmeet_bond 2 · 1 1

fedest.com, questions and answers