{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 6.Biomechanics.Students

# Lecture 6.Biomechanics.Students - MECHANICS OF THE...

This preview shows pages 1–4. Sign up to view the full content.

1 MECHANICS OF THE MUSCULOSKELETAL SYSTEM Lecture 6 Applications to Biomechanics OBJECTIVES | Be able to draw a free-body diagram (FBD) for a statically determinate joint. | Use the equilibrium equations to solve for joint reaction forces for a statically determinate case. Discuss how engineers can quantify injury in | Discuss how engineers can quantify injury in order to develop safer products and provide examples | Describe whiplash STATIC EQUILIBRIUM | Derived from Newton’s laws of motion | Static equilibrium means no accelerations - but not necessarily no motion

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 EQUATIONS OF EQUILIBRIUM Forces: F i = 0 F x = 0 F y = 0 By definition , force is positive in the positive direction of the coordinate axis chosen Moments (Force × Distance): F z = 0 M i = 0 M x = 0 M y = 0 M z = 0 By definition , a moment is positive if the moment rotates the body counter- clockwise (CCW) FREE BODY DIAGRAM | A pictorial representation of forces and reactions | Forces drawn on a detached (free) body | Label distances between forces and moments JOINT REACTIONS SOLUTION METHOD | Draw a complete free-body diagram | List simplifying assumptions | List the known quantities | List the unknown quantities | Write all the equations of equilibrium | If number of unknowns = number of equations, solve the resulting system of equations
3 EXAMPLE: CANTILEVER BEAM a M R F = 0 -P + R = 0 Pa - M = 0 P M = Pa M = 0 R = P EXAMPLE PROBLEM FORCES IN AN ELBOW JOINT J y B θ 1. Elbow joint is frictionless : no moment W a J x b 2. W is much greater

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 11

Lecture 6.Biomechanics.Students - MECHANICS OF THE...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online