During stair up and down how much force is created at foot. And in which the force is more stair up or stair down............?
Is there any method or article is support to this......?
Dear Hemal,
Please read the following text:
Computing the work you will do. Since work is force times the distance through which the force acts, you will find the amount of work you do in climbing the stairs by multiplying your weight in newtons by the height of the stairs in meters. Force measured in newtons, times distance measured in meters, gives the metric unit of work or energy, and it is called the joule. (For example if an 80 pound person climbs a flight of stairs which goes up one floor, this person will exert a force of about 360 newtons through a distance of about 4 meters, hence the person will do about 1440 joules of work.)
Computing the amount of power you develop: Power is the amount of work you do divided by the amount of time it took to do the work. The work you did in climbing the stairs is the force you applied (your weight) times the distance you moved upward (the height of the stairs.) That is:
Work (in joules) = your weight (in newtons) X the height of the stairs (in meters.)
Now the power you developed is the work you did divided by the time it took, or:
Power (in watts) = work (in joules) divided by the time (in seconds.)
If we call the time it took for you to climb the stairs in seconds, T, the height of the stairs in meters, h, your weight in newtons, W, then to find the power you developed in watts, P, the following formula restates what we said above:
P = W x h/t
The difference between stair up and stair down will be the difference in the power in the two cases.
If you need more details you can access the following link:
http://www.physics.ucla.edu/k-6connection/forwpsa.htm
Hoping this will be helpful,
Rafik
Dear Hemal,
Please read the following text:
Computing the work you will do. Since work is force times the distance through which the force acts, you will find the amount of work you do in climbing the stairs by multiplying your weight in newtons by the height of the stairs in meters. Force measured in newtons, times distance measured in meters, gives the metric unit of work or energy, and it is called the joule. (For example if an 80 pound person climbs a flight of stairs which goes up one floor, this person will exert a force of about 360 newtons through a distance of about 4 meters, hence the person will do about 1440 joules of work.)
Computing the amount of power you develop: Power is the amount of work you do divided by the amount of time it took to do the work. The work you did in climbing the stairs is the force you applied (your weight) times the distance you moved upward (the height of the stairs.) That is:
Work (in joules) = your weight (in newtons) X the height of the stairs (in meters.)
Now the power you developed is the work you did divided by the time it took, or:
Power (in watts) = work (in joules) divided by the time (in seconds.)
If we call the time it took for you to climb the stairs in seconds, T, the height of the stairs in meters, h, your weight in newtons, W, then to find the power you developed in watts, P, the following formula restates what we said above:
P = W x h/t
The difference between stair up and stair down will be the difference in the power in the two cases.
If you need more details you can access the following link:
http://www.physics.ucla.edu/k-6connection/forwpsa.htm
Hoping this will be helpful,
Rafik
Thank you sir for your suggestion but its there any instrument to shows that number and during walking we can measure that force......? or is there any study done for that purpose.?
Gait Event Detection during Stair Walking Using a Rate Gyroscope
Sensors 2014, 14, 5470-5485; doi:10.3390/s140305470
www.mdpi.com/journal/sensors
There are several papers that deal with the kinetics of stair climb, check the links, also there is an online presentation for that.
If you want to measure the force directly you can either go into pressure insoles ( I ahve worked with Medilogic brand, but there are also Novel/Pedar/Tekscan and probably several other brands available.).
Also, AMTI did an instrumented staircase that uses force plates inside each stair. You can find it on AMTI website, there was also some paper that utilized that solution few years back in G&P - I will try to find it later.
http://dx.doi.org/10.1016/S0966-6362(01)00201-6
http://www.slideshare.net/dr_hetvi/biomechanics-of-stair-climbing
http://www.gaitposture.com/article/S0966-6362(01)00201-6/abstract
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