15 Questions
What is the formula for calculating torque?
$\tau = F \times r$
In which unit is force measured?
Newton (N)
What does it mean if the torque is zero?
The force is passing through the pivot point
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
What represents the center of mass in an object?
The geometric center of the object
How can the direction of torque be obtained?
By using the right-hand rule
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
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
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
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
What problem do people who have lost an arm often experience?
Permanent distortion of the spine due to continuous compensatory bending of the torso
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
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
What force is required to topple an erect person standing at rigid attention if Fa x 1.5 = 68.6?
$45.7$ N
What torque is produced by the applied force when pivoting around point A if Fa x ra = Fa x 1.5?
$Fa x 1.5$
Test your knowledge of torque and statics with this quiz based on Chapter Two of Biophysics by Dr. Mohaned Mohammed. Explore questions related to the calculation of torque, including the relationship between applied force, arm length, and angle, as well as the measurement of force in Newtons.
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