Linear motion Flashcards
BIOMECHANICAL MOVEMENT
what is linear motion
motion in a straight line or curved line, with all body parts moving at the same speed and direction
scalar quantities
only has magnitude
- distance, area, volume
- speed
- mass, density
- pressure
- temperature
- energy
- power
vector quantities
has both magnitude and direction
- displacement
- velocity
- acceleration/ deceleration
- momentum
- force
- lift, drag, thrust
- weight
length of arrow shows the magnitude
the longer the arrow the bigger the size
direction is shown by a line of application
what is mass
- physical quantity of matter
- made of bone, muscle, tissue and fluid
- measured in kilograms
- mass is scalar
what is weight
- force on a given mass due to gravity
- measured in newtons
- weight = mass x gravity
- gravity = 9.8n/kg
- weight on the moon is 1/6 of earths weight = 1.6n/kg
- weight is vector
what is distance
- measured in metres
- the path a body takes as it moves from the starting and end position
what is displacement
- measured in metres
- shortest route in a straight line between start and end points
definition and calculation of acceleration and deceleration
definition - the positive (acceleration) or negative (deceleration) change in the velocity of an object
calculation - (m/s²) acceleration/deceleration = change in velocity/time
definition and calculation of momentum
definition - amount of motion an object, resulting from mass and velocity
calculation - momentum (kgm/s) = mass x velocity
definition and calculation of an impulse
definition - the product of the amount of force exerted and time that its exerted for, goes in a particular direction (vertical/horizontal)
calculation - impulse = force x time
explanation of the 3 impulse graphs
graph 1 = resembles the start of a race, large positive force shows acceleration
graph 2 = resembles the middle of the race as both negative and positive impulses are equal
graph 3 = resembles the end of the race, large negative force shows deceleration
