##### motion 4
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#### Complete list of Terms and Definitions for motion 4

Terms Definitions
pertinacious stubbornly unyielding
persist continue to exist
perceive to become conscious of
flexion the act of bending.
newton the SI unit of force
speed equation distance divided by time
Movement away from the mid line Abduction
trochlea a pulley; pulley-shaped or articulates with a spool-shaped bone
acceleration the rate at which velocity changes
perturb to throw into great confusion or disorder
Laterally rotating the radius until it is parallel with the ulna; moving the palm back to anatomical position Supination
average speed final distance divided by final time
velocity describes a moving object's speed and direction
power the rate at which work is done
net force the force that results form combining all the forces exerted on an object
2nd Law Force = mass x acceleration (the larger the force the larger the acceleration)
Balanced forces result in a net force of zero.
inertia when an object resists a change in motion
displacement the act of compelling people to leave or relocate
Extension of IP joints Opening of fist to MP flexion
the energy of stretched or compressed objects elastic potential energy
Condyle A rounded knob on the end of a bone; used for articulation with another bone&#13;&#10;
Newton's First Law Law of Inertia--an object at rest will stay at rest, an object in motion will stay in motion unless acted upon by an outside force
the rule that energy cannot be created or destroye law of conservation of energy
Equilibrium Rule EF=0
Gravity force of attraction
Newton The scientific unit of force.
Which depends on gravity-weight or mass? Weight
Interaction Mutual action between objects where each object exerts equal ad opposite force on the other.
Speed Rate at which an object moves
Vector In general, a vector quantity is characterized by having both a magnitude and a direction.
Inversely When two values change in opposite directions, so that if one increases and the either decrease by the same amount, they are said to be inversely proportional to each other.
Free Fall Motion under the influence of gravitational pull only.
Scalar A scalar quantity has a magnitude, but no direction.
Average acceleration The average acceleration during the time interval is the change in velocity divided by
Support Vector The force that supports an object against gravity.
Average velocity The average velocity during a time interval is the displacement divided by
What two quantities are necessary to determine a vector quantity? Magnitude and direction
Unbalanced Forces Forces that are not equal and change or motion happens.
What is the name of the force when a piece of rope is pulled in opposite directions? Tension
Balanced Forces Forces that are equal and no change or motion happens
Newton's THIRD Law is the law of : and : Action force and reaction force