Physical Science Applications in Agriculture Unit Physical Science Systems.
Physical Science Applications in Agriculture
description
Transcript of Physical Science Applications in Agriculture
Physical Science Applications in Agriculture
Unit
Physical Science Systems
Problem Area
Agricultural Mechanics and Machine Systems
Safe Handling and Loading:Balance and Center of Gravity
Lesson
What is a roll-over?
• Discuss tractor safety and rollover protection.
• Anyone personally aware of tractor rollovers.
• Discuss loading and transport.
• Have any of them dumped a load or heard of someone who has dumped a load?
Learning Objectives1. Define stability.
2. Explain the center of gravity.
3. Calculate the center of gravity.
Terms
• Balance• Center of gravity• Equilibrium• Stability
www.cdc.gov/www.galleri-bjorn.dk/.../pages/John%20Deere4.htm
What is stability?
• Stability – Refers to a condition of
balance.
• Center of gravity is critical to stability.
• If an object is tipped, but will return to its original position when released, it is in stable equilibrium.
www.alpaca-info.com/ranch.htm
What is stability?
• For a stable equilibrium condition, a plumb line dropped from the center of gravity will fall within the base of the object.
www.safetyline.wa.gov.au/.../lecture78/l78_03.asp
What is stability?
• If an object is tipped to a point where a plumb line attached to the center of gravity falls outside its base, an unstable equilibrium condition exists.
www.safetyline.wa.gov.au/.../lecture78/l78_03.asp
What is stability?
What is center of gravity?
• Center of gravity – Point at which all
parts or areas of a body are balanced.
• Balance – Stability or
equilibrium
iareh.usask.ca/rhep/.../slide0004.htm
THE CENTER OFGRAVITY ON A TRACTOR
What is center of gravity?
• The typical tractor has its center of gravity located between the front and rear wheels behind the midpoint of the tractor’s length and above the axle height.
• Center of gravity of an object will always seek the lowest possible position.
• If tipping an object lowers the center of gravity, the object will not return to its original position.
What is center of gravity?
www.alpaca-info.com/ranch.htm
Where is the center of gravity located on a tractor?
• Center of gravity of an object determines the stability of that object.
Where is the center of gravity located on a tractor?
• The center of gravity will always seek the lowest position possible; therefore great care must be taken when loading or hitching to prevent rollover.
• The external forces acting on a tractor pulling an implement can be quantified and analyzed.
Where is the center of gravity located on a tractor?
• Hitch height is an important variable in stability.
1. If hitch height is too high, the hitched tractor is not in equilibrium.
2. Hitching at a lower point or weighing the front of the tractor can prevent unsafe rollover conditions from occurring.
Where is the center of gravity located on a tractor?
Where is the center of gravity located on a tractor?
• The object will be stable if a plumb line dropped from the center of gravity passes through the base of the object.
Review/Summary
• What is stability?
• What is center of gravity?
• Where is the center of gravity located on a tractor?