Lecture 2

Question 1

kinematics

Answer 1

the study of motion (without regard to the forces that cause it)

Question 2

kinetics

Answer 2

the study of forces

Question 3

qualitative analysis

Answer 3

numerical evaluation of motion based on measurement

Question 4

qualitative analysis

Answer 4

non-numerical evaluation of motion based on observation

Question 5

ex of qualitative and quantitative

Answer 5

qualitative: the hip flexes, the knee flexes
quantitative: the hip undergoes x of flexion

Question 6

statics

Answer 6

evaluation of objects in a state of equilibrium
-objects are at rest or moving at a constant velocity
-evaluation of the start position

Question 7

dynamics

Answer 7

evaluation of objects that are not in a state of equilibrium
-objects are speeding up or slowing down
-evaluation following start command

Question 8

scalars: can be described fully by their magnitude

Answer 8

distance

-speed, mass volume, energy

Question 9

vectors: to fully describe a vector, its magnitude and direction is required

Answer 9

displacement

-velocity, acceleration, force

Question 10

linear motion

Answer 10

straight or curved motion such as that all parts of an objects move the same distance in an equal amount of time

also known as translation or translations motion

Question 11

angular motion

Answer 11

motion about an axis of rotation such that regions of a segment rotating about that axis do not move through the same distance in an equal amount of time

Question 12

what is gait?

Answer 12

a particular patter of footfalls that are used in locomotion
the two primary gait patterns are walk and a run

Question 13

gait cycle events (walking)

Answer 13

stance phase = 60% of the stride
swing phase = 40% of the stride
single support = 80% of the stride
double support = 20% of the stride

Question 14

Gait: step

Answer 14

the process of moving one limb forward

Question 15

Gait: stride

Answer 15

the process of making one step with each foot

Question 16

gait: stride time

Answer 16

the time it takes to complete one stride

Question 17

gait: stride length

Answer 17

distance between heel strikes of the same foot

Question 18

stride velocity =

Answer 18

stride length / stride time
vector

Question 19

walking speed =

Answer 19

distance /time
scalar
includes speeding up and slowing down

Question 20

stride cadence =

Answer 20

1/ stride time

Question 21

what happens to stride velocity when you change stride length and stride cadence ?

Answer 21

increase

Question 22

walk

Answer 22

alternating pattern of one foot -two foot
(at least one foot in contact)

Question 23

run

Answer 23

alternating patter of one foot - no feet
(an airborne phase between contacts

Question 24

advantages of qualitative analysis

Answer 24

-easy to apply
-does not require specialized equipment
-takes less time
lower cost

Question 25

disadvantages of qualitative analysis

Answer 25

-subjective
-less accurate
-provides general information

Question 26

advantages of qualitative analysis

Answer 26

-objective
-more accurate
-provides specific information

Question 27

disadvantages of qualitative analysis

Answer 27

-higher cost
-takes more time
-requires specialized equipment
-hard to apply