Week 3 - Anthropometry Flashcards
Scalar
quantities that have a magnitude
- 28 degrees
- 25kgs
- 1.8m
Vector
quantities that have a magnitude and a direction
- 25degrees North
- 26km/h West
Distance
how much ground is covered, scalar
Displacement
how far away you are from the start, vector
Speed
time rate of change of distance
distance/time, scalar
Velocity
Time rate of change of displacement
displacement/time, vector
Position
location, vector
What is the symbol for displacement?
X_
What does - and + mean infront of velocity values?
Up/right or down/left
What does delta stand for?
Change
What is acceleration?
the time rate of change in velocity
m/s2
What does - and + mean in front of acceleration values?
positive = accelerating negative = slowing down
When there is a 0 value for acceleration, what does that mean?
- no movement
- constant velocity
What is one radian in degrees?
1 radian = 57.3 degrees
What is the symbol for displacement?
θ
In reference to displacement, is clockwise or anticlockwise positive?
Anticlockwise
When using a cartesian co-ordinate system, what does the Y value need to be in regards to the X value?
Right angle
thumb rule for Z
What is the laboratory/global co-ordinate system?
when the origin is the plate/ground, and all angles are in reference to the joint
What is the segment/embedded co-ordinate system?
When the camera is attached to a segment and the original is a joint
What is mass?
amount of matter in an object?
What is weight?
weight force
What unit is weight measured in?
Newtons (N)
How do you measure weight?
mass x acceleration due to gravity
What does ‘wg’ stand for?
weight due to gravity
What does xCOM stand for?
centre of mass distribution
what does x stand for in the COM equation?
position of each object
What does the E stand for in the COM equation?
add all mass x position values up
