Lecture 4 Flashcards
(33 cards)
What is a vector
magnitude AND direction
deals with
- displacement
- velocity
- acceleration
What is a scalar?
magnitude ONLY
deals with
- distance
- speed
what are (-) and (+) of Linear Kinematic?
up: (+)
down: (-)
right: (+)
left: (-)
forward/anterior :(+)
backward/posterior:(-)
what are (-) and (+) of angular Kinematic?
Counterclockwise (ccw)= (+)
clockwise (cw)= (-)
What is the right thumb rule
the thumb of your right hand points in the direction of the axis of rotation, and the curl your fingers is the positive direction of rotation.
point your thumb in either
- right
- up
- forward
you fingers will then be pointing in the + direction
What is displacement
This is just how far you went from point A to point B in a straight line ( vector)
What is distance
this is the distance you took from the whole path (scalar)
What is angular displacement
- change in angular position
- the direction angular distance form initial to final angular position
- the vector equivalent of angular distance
- measured in units of degrees, radians, or roations
what is angular distance
- sum of all angular changes
- the scalar equivalent of angular displacement
- measured in units of degrees, radians, or roations
What happens when you return to the same place as you started?
This would mean you would have and angular displacement of 0. just thing of then the forearm return to original position at the completion of a curl it really didnt go anywhere
what is the relationship btwn linear and angular displacement
the ↑ the radius btwn a give point on the rotating body and the axis of rotation. the ↑ the linear distance traveled by the point during an angular motion
- think why at track meet they have to stagar people at the start
- think of the slide with the triange and lengths
s=ro( sima)
What is Linear velociy
vector
- this is the rate of change in location
v= change in displacement / change in time
- measured in m/s or km/hr
what is linear speed
scalar
- distance covered over the them taken
s=distance /time
-measured in units of m/s or km/hr
what s angular velocity
Vector
- the rate of change in angular position
angular velocity (w)= degree/ time -measured in degree/sec
what is angular speed
Scalar
-the rate of change in angular distance
angular speed ( sima)= angular distance / time - measured in degrees / sec
what is the relationship between linear and angular velocity?
since velocity is displacement over time, linear and angular velocity are related by the same factor that relates displacement : the radius of rotation ( r)
V=r* angular velocity( w)
what is the relationship btwn linear and angular motion
the ↑ the angular velocity of a baseball bat, the farther a struck ball will travel, other conditions being equal
What is acceleration
the rate of change in linear velocity
a= (v2-v1)/t
-measured in units of m/s^2
what happens to the acceleration as you change directions and change speed
-Speeding up (right)
V (direction of motion)= (+)
change in motion ( speeding up or slowing down)= (+)
A ( direction of acceleration=(+)
what happens to the acceleration as you change directions and change speed
-Not changing (right)
V (direction of motion)=(+)
change in motion ( speeding up or slowing down)= 0
A ( direction of acceleration=0
what happens to the acceleration as you change directions and change speed
-slowing down (right)
V (direction of motion)=(+)
change in motion ( speeding up or slowing down)= (-)
A ( direction of acceleration=(-)
what happens to the acceleration as you change directions and change speed
-speeding up (Left)
V (direction of motion)=(-)
change in motion ( speeding up or slowing down)= (+)
A ( direction of acceleration=(-)
what happens to the acceleration as you change directions and change speed
-Not changing (Left)
V (direction of motion)=(-)
change in motion ( speeding up or slowing down)= 0
A ( direction of acceleration=0
what happens to the acceleration as you change directions and change speed
-slowing down (Left)
V (direction of motion)=(-)
change in motion ( speeding up or slowing down)= (-)
A ( direction of acceleration=(+)
