31 Questions
In static (rotational) equilibrium, what condition must be satisfied?
Net torque on the rigid body is zero
What does dynamic (translational) equilibrium imply?
The net force on the rigid body is zero
What physical quantity causes an object to begin rotating or moving in a circle?
Torque
What is the equation for torque?
$\tau = dF\sin\theta$
What does a net torque of zero indicate about a rigid body?
The rigid body is in static (rotational) equilibrium
When is a seesaw perfectly balanced?
In static equilibrium
What factor does torque depend on?
Force, distance, and angle
In dynamic equilibrium, what is the condition for the rigid body?
Experiencing no translational acceleration
What does a net force of zero indicate about a rigid body?
The rigid body is in dynamic (translational) equilibrium
What is the point of rotation in a lever known as?
Fulcrum
In a first class lever, when is the mechanical advantage (MA) greater than 1?
When the force arm is longer than the load arm
Which type of lever is commonly found in the human body, producing speed and range of motion movements?
Third class lever
What serves as the fulcrum in the human body's lever system?
Joints
What movement is produced by a third class lever in the human body?
Speed and range of motion
In a second class lever, where is the load positioned in relation to the fulcrum and the force?
Between the fulcrum and the force
What is the ratio used to calculate mechanical advantage (MA) in a lever?
Force arm / Load arm
In a third class lever, where is the force positioned in relation to the fulcrum and the load?
Between the fulcrum and the load
What is the function of the bones in the human body's lever system?
To serve as levers
When is the mechanical advantage (MA) equal to 1 in a lever system?
When the force arm is equal to the load arm
What is the characteristic feature of a second class lever?
The load is between the fulcrum and the force
What does a positive torque indicate when using the right hand rule for counterclockwise rotation?
The rotation is counterclockwise and the torque is positive
Where is the center of mass or center of gravity of a symmetric object located?
At the geometrical center
How can the center of mass of an irregular-shaped object be determined?
By drawing vertical lines from different suspension points and finding their intersection
In what position does a system experience static stable equilibrium?
There is a vertical line that passes both the object’s center of gravity and its base of support
What is a lever?
A device that applies force or transfers it
What does a negative torque indicate when using the right hand rule for clockwise rotation?
The rotation is clockwise and the torque is negative
Where can the whole mass of a body be considered to be concentrated?
At the center of mass or center of gravity
What does the intersection of drawn lines from different suspension points indicate for an irregular-shaped object?
The center of mass
What does a system experience if it returns to equilibrium after being small displaced?
Static stable equilibrium
What is the condition for a system to be in static stable equilibrium?
There is a vertical line that passes both the object’s center of gravity and its base of support
What type of device is a lever?
A force-applying or force-transferring device
Test your knowledge of statics and biomechanics with this quiz! Explore concepts related to stability in systems and the influence of gravity. From understanding body shapes in aquatic animals to the importance of statics in biomechanics, this quiz will challenge your understanding of these fundamental principles.
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