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77 Cards in this Set
- Front
- Back
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In the lever system, the point of rotation is known as the:
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Fulcrum
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The Law of _________ states that a change in the acceleration of a body is directly proportional to the force causing it and inversely proportional to the mass of the body:
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Acceleration
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When the fulcrum is between the force and the resistance the lever system is known as a _______ class lever.
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1st
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A lever system with the force between the fulcrum and the resistance is best designed for:
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speed and range of motion
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A lever system with the resistance between the force and the fulcrum is best designed for:
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force movements
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When the resistance is between the force and the fulcrum, the lever system is known as a ________ class lever.
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2nd
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Distance between the axis and the point of force application
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Force Arm
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Ability to control equilibrium, either static or dynamic
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Balance
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State of zero acceleration in which there is no change in the speed or direction of the body
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Equilibrium
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Point at which all of the body's mass and weight are equally balanced or equally distributed in all directions
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Center of Gravity
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Distance between the axis and the point of resistance application
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Resistance Arm
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Moment of force
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Torque
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Motion along a line
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Linear Motion
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Motion involving rotation around an axis
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Angular Motion
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Rate of change in velocity
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Acceleration
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Resistance to a change in the body's acceleration; the resistance to a disturbance of the body's equilibrium
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Stability
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Body at rest or completely motionless
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Static Equilibrium
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All of the applied or inertial forces acting on the moving body are in balance, resulting in movement with unchanging speed or directions
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Dynamic Equilibrium
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Resistance to action or change
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Inertia
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Quality of motion, equal to Mass x Velocity
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Momentum
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Mass x Acceleration
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Force
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Shoveling lever class
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Third
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"Effort, E"
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Force
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Description of a system's motion including consideration of time, displacement, velocity, acceleration, and space
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Kinematics
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Load divided by effort
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Mechanical Advantage
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Most common machine in humans
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Lever
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Point of rotation about which lever moves
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Axis
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Study of forces associated with motion of a body
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Kinetics
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Moving the resistance closer to the axis _______ the distance the resistance moves.
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Decreases
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Study of the systems in motion with acceleration
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Dynamics
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When force arm and resistance arm are equal in length, a force _______ to the resistance is required to balance it.
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Equal
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Lever class where large force is needed to move a small resistance
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Third
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Crowbar lever class
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First
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Lever class with resistance between force and axis
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Second
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Study of systems that are in a constant state of motion
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Statics
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-ism
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process; condition
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Relationship between force components and resistance components
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Proportional
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Increase mechanical advantage
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Machines
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Study of mechanics relating to functional and anatomical analysis of humans
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Biomechanics
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See-saw lever class
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First
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As the force arm length _______ an increasing amount of force is required to move a relatively smaller resistance.
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Decreases
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Function to change effective direction of force application
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Pulleys
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Statics and dynamics
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Mechanics
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Effectiveness of imparting velocity may be increased by _______ the lever.
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Lengthening
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Relationship between length of force arm and resistance arm
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Inverse
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Lever class for balance movements
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First
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Rigid bar that turns about an axis of rotation
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Lever
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Force applied in a directions not in line with center of rotation of object with fixed axis
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Eccentric
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If either of the resistance components increase, there must be an _________ in one or both of force components.
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Increase
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Lever class for moving large resistance with small force
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Second
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Force X force arm
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Torque
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Wheel has a mechanical advantage over the axle when wheel radius is _______ than axle radius.
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Greater
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Moving the point of force application closer to the axis _______ the speed.
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Increases
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As ______ arm length increases, a decreasing amount of force is required to move a relatively larger resistance.
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Force
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Wheelbarrow lever class
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Second
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Required to change inertia
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Force
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For every action there is an opposite and equal reaction (law)
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Reaction
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Force of the surface reacting to the force placed on it
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Ground Reaction
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Amount of matter in a body
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Mass
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Body in motion tends to remain in motion (law)
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Inertia
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Actual distance an object has been displaced from its original point of reference
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Displacement
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Relationship between mass of an object and its inertia
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Proportional
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Balance may be enhanced by ________ the center of gravity.
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Lowering
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When stimulus is not strong enough to cause an action potential
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Sub threshold
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Reluctance to change status
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Inertia
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Linear motion
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Translatory
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Larger bases of support provide for _______ balance.
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More
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Resistance to an object rolling across a surface.
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Rolling Friction
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Stability may be increased by __________ the base of support.
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Enlarging
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Force resulting from resistance between surfaces of two objects from moving upon one another
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Friction
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Friction between two objects sliding upon one another
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Kinetic
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Static and kinetic friction is _______ than rolling friction.
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Greater
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Relationship between momentum and inertia
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Proportional
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Kinetic friction is _______ than static friction.
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Less
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Change in location of a rotating body
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Angular Displacement
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Relationship between the change in acceleration and the mass of the body
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Inverse
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Angular motion
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Rotary
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