Biomechanics - Numerical Final Exam Review

These flashcards cover key calculations and concepts related to biomechanics, specifically focusing on torque, friction forces, angular velocity, and angular acceleration to aid in exam preparation.

What is the formula for calculating arc displacement in a circle?

Arc displacement can be calculated using the formula: Arc Displacement = Radius × Angle (in radians).

What is the arc displacement for a femoral head with a radius of 3 cm rotating through 60°?

The arc displacement is approximately 3.14 cm.

What is the friction force for a 75 kg person with normal synovial fluid (µk = 0.003)?

The hip friction force is approximately 5.29 N.

For a patient with osteoarthritis (µk = 0.3), how much friction force is generated in the hip?

The hip friction force is approximately 529.2 N.

What is the friction force between titanium and bone if the coefficient of friction (µk) is 0.63?

The friction force is approximately 1111 N.

How do you calculate torque?

Torque = Force × Distance from joint.

Calculate the torque produced by a 900 N force acting 0.30 m from the knee joint.

The torque produced is 270 N·m.

What is the percentage error in torque measurement if the measured torque is 252 N·m?

The percentage error in torque measurement is approximately 6.6%.

What is the angular velocity after a leg sweeps 60° in 5 seconds from rest?

The angular velocity is approximately 0.21 rad/s.

What is the angular acceleration for a leg that sweeps 60° in 5 seconds?

The angular acceleration is approximately 0.04 rad/s².