falling objects guide - theatre safe australiaterms • kinetic energy (ke) is the energy of motion...
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This product is intend for trained and competent persons and should only be considered as a guide only. TSA takes no responsibility for any information a person uses from this documentation.
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Falling Objects Guide
Terms • Kinetic Energy (KE) is the energy of motion • Velocity (V) is the rate at which an object changes its position • Joule (J) is a unit of energy • Newton (N) or a Kilonewton are units of force • Gravitational Acceleration (g) is the acceleration on an object caused by force of gravitation • Mass (M) is the weight of an object • Height (H) refers to the vertical distance of a fall in meters
Conversions • Gravitational Acceleration (g) = 9.8m/s • 1 Joule (J) = 10 Newtons (N) • 1000 Newtons (N) = 1 Kilonewton (KN) • 1 Kilonewton (KN) = 100 Kilograms (KG)
Formulas • Velocity = √ 2 x (g x h) • Kinetic Energy = (0.5 x M) x (V²)
Key Information To Remember
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How To Calculate The Force Of A Falling Object
To calculate the force of a falling object you must first discover the velocity that object is traveling at, once this has been calculated you can then discover the Kinetic Energy of that object. See an example below:
If a 10kg counter weight is falling from a height of 15m what is the impact force of that weight?
!Velocity = √ 2 x (g x h) Velocity = √ 2 x (9.8 x 15) Velocity = √ 2 x (147) Velocity = √ 294 Velocity = 18m/s (rounded Up) != The total impact force of the 10KG counter weight falling from a height of 15m is 1.6KN or 160KG !NB: Always round up figures in rigging and safety
Kinetic Energy = (0.5 x M) x (V²) Kinetic Energy = (0.5 x 10) x (18²) Kinetic Energy = (5) x (324) Kinetic Energy = 1620 J
1620 J = 1.6KN 1.6 KN = 160KG
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How Much Can The Body Handle (Gravitational Force)
!• Between 5g - 8g will cause the average human to be loose consciousness\ !• In the average human 14g will cause tearing of internal organs !• After 3 minutes of a human hanging in a standard harness the blood will pool in the legs and
start to cause detrimental effects on the body, In a worse case scenario death of a human can apply within 10 minutes of suspension in a standard harness. These types of injures are referred to as suspension trauma, First responders should not use standard first aid treatment on casualties of suspension trauma (unless CPR is required) as this could cause reflow syndrome. First responders should contact emergency services for emergency advise.
!• 510N of force can cause a fracture to the skull
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Safety LanyardKick Rail & Hand Rail
How To Reduce The Risk Of Falling Objects !• All Raised work platforms must have a kick rail/ toe rail installed • Position Storage buckets at entrances of raised work platforms so all personal loose items can be stored • Insure any tools being used at height have safety lanyards attached to them • All Raised platforms must have guard rails / hand rails installed • Keep all height access areas clear and clean of debris • Keep area below workers clear of personnel for their safety
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References: https://www.safetyequipment.org
https://www.millerfallprotection.com http://hyperphysics.phy-astr.gsu.edu
This product is intend for trained and competent persons and should only be considered as a guide only. TSA takes no responsibility for any information a person uses from this documentation.
Please consulate a professional on the best product for your use
www.theatresafe.com.au [email protected]
www.facebook.com/theatresafeaustralia