Tag Archives: Physics

WHAT IS A FREE BODY DIAGRAM-BIOMECHANICS NOTES

A free body diagram of a mass on an inclined plane

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A Free Body Diagram is a pictorial representation often used by physicists and engineers to analyze the forces acting on a free body. A free body diagram shows all contact and non-contact forces acting on the body. Drawing such a diagram can aid in solving for the unknown forces or the equations of motion of the body. Creating a free body diagram can make it easier to understand the forces, and moments, in relation to one another and suggest the proper concepts to apply in order to find the solution to a problem. The diagrams are also used as a conceptual device to help identify the internal forces, (for example shear forces and bending moments in beams), which are developed within structures

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SHORT NOTES ON BASIC CLINICAL SCIENCES–EAR AND HEARING MECHANISM-

Sound is Produced by Vibrations in Matter (Air, Liquids, Solids)

  • Anything which causes matter to vibrate will produce sound
  • Vocal cords vibrate and push on the air flowing through the larynx, causing the air to vibrate
  • Sound cannot travel through a vacuum
  • Sound velocities:
    • Air: 344 meters/sec (770 miles/hr)
    • Water: 1500 meters/sec (3360 miles/hr)
    • Solids: about 5000 meters/sec (11,200 miles/hr)

Pitch is Determined by the Frequency of Vibration

  • We perceive fast vibrations as high pitches, slow vibrations as low pitches
  • When we are young we can hear vibrations from about 20 hertz to about 20,000 hertz
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