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Biophysics Dr. Mohaned Mohammed: Chapter Two Statics and Torque Quiz

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Biophysics Dr. Mohaned Mohammed: Chapter Two Statics and Torque Quiz

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Questions and Answers

What is the formula for calculating torque?

$\tau = r \div F$

$\tau = F + r$

$\tau = F - r$

$\tau = F \times r$ (correct)

In which unit is force measured?

Joule

Newton (N) (correct)

Watt

Pascal (Pa)

What does it mean if the torque is zero?

The angle between the force and the arm length is zero

The force is passing through the pivot point (correct)

The applied force is zero

The length of the arm is zero

What are the conditions for a body to be in mechanical equilibrium?

Resultant external force equals zero and resultant external torque about any axis equals zero Signup and view all the answers

What represents the center of mass in an object?

The geometric center of the object Signup and view all the answers

How can the direction of torque be obtained?

By using the right-hand rule Signup and view all the answers

What is the condition for a body to be in stable equilibrium under the action of gravity?

The center of mass position must be directly over its base of support Signup and view all the answers

In unstable equilibrium, what happens if the center of mass is still above its base?

The reaction force at the pivoting point and force produced by the body weight try to restore the body to its original position Signup and view all the answers

Where is the center of gravity of an erect person with arms at the side located?

56% of the person’s height measured from the soles of the feet Signup and view all the answers

What does a person tend to do when carrying an uneven load?

Compensate by bending and extending the limbs to shift the center of gravity back over the feet Signup and view all the answers

What problem do people who have lost an arm often experience?

Permanent distortion of the spine due to continuous compensatory bending of the torso Signup and view all the answers

What is the torque produced by a person's weight if their mass is 70 kg and gravitational acceleration is 9.8 m/s^2?

$68.6$ N.m Signup and view all the answers

What is the opposite restoring torque due to a person’s weight if their mass is 70 kg and gravitational acceleration is 9.8 m/s^2?

$68.6$ N.m Signup and view all the answers

What force is required to topple an erect person standing at rigid attention if Fa x 1.5 = 68.6?

$45.7$ N Signup and view all the answers

What torque is produced by the applied force when pivoting around point A if Fa x ra = Fa x 1.5?

$Fa x 1.5$ Signup and view all the answers