Biomech Unit 1 part 1 Flashcards
(35 cards)
Name the four base SI units
metres, seconds, kilogram, kelvin
Name the supplementary SI units
radian
Give example of a derived unit
Newton - kgms-2
What is the prefix for mega
x10^6
Prefix for micro
x10^-6
Prefix for nano
x10^-9
SI unit for angle and common unit
radian - SI
common - degrees
SI unit for temp and common unit
Kelvin - SI
Common - degrees celsius/fahrenheit
What is a reference frame?
A plane in which an objects motion and position is related to
Naem the two co-ordinate systems
Rectangular coordinate system and polar co-ordinate system
Describe the rectangular one
aka cartesian co-ord system - x,y,z axis (think of cube)
What is a plane
a flat surface with zero thickness therefore 2D
What is formed where two planes cross each other?
a straight line
What is a polar co ordinate
used in circular objects where angles and rotations are important
What co ordianted system is used for joints motion?
polar
What is a vector quantity
Magnitude and direction
Velocity vs speed
Velocity - rate of change of dispalcement therefore vector
Average velocity
V = change in dispalcement / time
Acceleration
Rate of change of velocity
Two effects of force
change the position of object and deform the shape
Which effect is ignored for rigid body mechanics
No deforming of shape
How do we measure force
calibrated spring balance
What does statics involve
forces and moments acting on objects at rest or moving with constant velocity
A static object has no acceleration but has a resultant force.
FALSE has neither
