[PT11] Mechanical Principles

that which alters the state of rest of a body or its uniform motion in a straight line

what is the composition of forces?

the effect of the application of a single force applied to a body

the effect of two forces acting in the same direction and at a common point

the effects of two equal forces acting at a common point, and in opposite directions

the effect of two unequal forces acting at a common point and in opposite directions

the effect of two forces acting at an angle to each other

the effect of two unequal forces acting at different points and in opposite directions

a system of forces tending to separate parts of the body with equal and opposite forces which hold the parts together; used synonymously with force

the force by which all bodies are attracted to the earth

acts continuously upon the human body, and if unopposed the body will fall to the ground

erect position is maintained by the integrated contraction of these muscles

the point through which the line of action of the weight acts

where the center of gravity of the human body is located

a vertical line through the center of gravity

where does the line of gravity of a human pass through?

the area by which a body is supported

where is the base support in humans?

the body restore to its original position after being displaces

the body tend to displace after application of a force, the body falls on the ground

there is a displacement of the body but the height and position of the center of gravity remain (e.g. a ball moves on a flat surface)

when is the stability of a human greatest?

how does the human body become less stable?

concentrates on the forces that produce or resist the movement

deals with types of motion or movement without regard for the forces that produce motion (type, direction, and quantity of motion)

subdivisions of kinematics

a line about which movement takes place

the surface which a movement takes place

these are used to describe movement

in an anterior-posterior direction

in the side-to-side direction

is parallel to the line of gravity

a surface that divides the body into upper and lower

a surface that divides body into anterior and posterior aspect

a surface that divides the body into right and left

which plane is trunk rotation performed?

which plane is shoulder adduction performed?

which plane is shoulder flexion performed?

which plane is supination-pronation performed?

which plane is hip abduction performed?

which plane is elbow flexion performed?

which plane is hip flexion performed?

the rate at which the body moves

the rate of motion which incorporates direction

the product of force and distance

the capacity of a body for doing work

the capacity for doing work by virtue of position

capacity for doing work because of its velocity

the rate of doing work or the rate of energy expenditure; (force*distance/time)

the unit of power

the rate of change in velocity

increase in velocity

decrease in velocity

the quantity of motion it possesses

how do you calculate momentum?

the resistance of a body to any change in its state of rest or motion; Newton's first law of motion

the force which opposes motion when one surface slides upon another

a rigid bar which is capable of movement about a fixed point called fulcrum

how is work done in a lever?

perpendicular distance from the fulcrum (F) to the effort (E)

perpendicular distance from the fulcrum (F) to the weight (W)

class of lever in which the fulcrum is in the middle of the weight and effort

class of lever in which the weight is in the middle of the fulcrum and effort

class of lever in which the effort is in the middle of the fulcrum and weight

example of 1st class lever

example of 2nd class lever

example of 3rd class lever

a movement in the vertical axis would occur in which plane?

a movement in the frontal axis would occur in which sagittal?

a movement in the sagittal axis would occur in which plane?

which plane and axis does cervical forward flexion occur in?

which plane and axis does internal rotation of the shoulder occur in?

which plane and axis does circumduction occur in?

which plane and axis does hip extension occur in?

which plane and axis does neck lateral flexion occur in?