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# The Biomechanics of Rock Climbing- Rappelling

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## Heather Moloney

on 21 March 2013

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#### Transcript of The Biomechanics of Rock Climbing- Rappelling

Heather Moloney
Julia Daun
Sabrina Sunderji
Jerard Lee Pan
Carrissa Lowhorn The Biomechanics of
Rock Climbing - Rappelling Rappelling Consists of
Two Parts: Rappelling (Abseiling) Overview APPLYING THE FORMULA SYSTEM: Belayer & belay device - Forces on the climber
- Normal Force
- Gravitational Force
- Friction Force

- Centre of Mass
- Gravitational Potential Energy BELAYER CLIMBER Forces FRICTION OF THE BELAY DEVICE BELAYING 101 Tubular belay device Harness Friction: Gravitational: Normal: Gravitational Potential Energy EXTERNAL FORCES: Force of the climber INTERNAL FORCES: Belay device, climber, belayer's hands Fk = UN Ep = 90.00kg x -9.81m/s2 x 13.10m
= 11 565.99 J The gravitational potential energy of a system consisting of the Earth and an object of mass (m) near the Earth's surface SI Units: Joules FORCES ACTING ON THE BELAY DEVICE:
- Carabiner & rope
- Hands & rope Now let's apply some numbers... A 90kg man Kinetic Friction Coefficient of friction Normal force LET'S CALCULATE! 1) Determine Normal Force:
(90kg)(-9.81m/s^2)
2) Determine proper coefficient: (0.5)
3) Plug it in! Introduction to Friction STEPS Main focus on the force
of friction within the belay and
climber, and discussing the
potential energy of the climber
as well as the COM. Friction: The resistance that one surface or object
encounters when moving over another, and is always in the opposite direction to movement Types of Friction: 1) Static

2) KINETIC Formula for Kinetic Friction: Coefficient:
- ratio of frictional
resistance force to normal
force that presses 2
surfaces together Normal Force:
- net force compressing two parallel surfaces together
- direction perpendicular to the surfaces Center of Mass Rappelling Fail References http://scholar.google.ca and https://www.google.ca/imghp?hl=en&tab=wi All Forces are Newtons for SI units
Definition: A point on the body or system of bodies where the concentration of the majority mass occurs.

- Rappelling and the change in COM http://www.engineershandbook.com/Tables/frictioncoefficients.htm Rock Climbing Instructor: Andrew Sawatsky
Rock Climbing TA: Charlie Shin Essential of College Physics- Serway, Vuille http://hyperphysics.phy-astr.gsu.edu/hbase/frict2.html#kin http://user.xmission.com/~tmoyer/testing/Simulation_of_Climbing_and_Rescue_Belays.pdf
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