1.4 Linear Motion Flashcards
Displacement
Vector
Describes how far an object is from where it started
Distance
Scalar
Describes overall how object has moved
Speed
Rate of change of distance
Scalar
Speed equation
Distance/time
Acceleration
Rate of change of velocity
What does delta triangle stand for?
Change in
Acceleration equation
Acceleration = v-u/t
Change in velocity
Change in speed and/or direction
Negative of object slowing down
Negative acceleration
Retardation/deceleration
Average velocity equation
Vav = u+v/2
5 equations of motion
V=u+at
S=ut+1/2at2
V2=u2+2as
S=1/2t(u+v)
S=vt-1/2at2
Acceleration under gravitational field
G = 9.81 ms-2
Object falling down ‘g’ value
Positive - 9.81
Object thrown up ‘g’ value
Negative - -9.81
Gradient of a displacement time graph
Velocity
Y intercept displacement time graph
Initial displacement
2 curves coincide displacement-time graph
Same displacement at this time
Straight line on displacement/time graphs
Constant velocity
Curved line displacement/time graphs
Acceleration
Average velocity on displacement/time graphs
Slope of straight line connecting end points of curve
Instantaneous velocity on displacement/time graphs
Slope of the line tangent to curve at any point
Positive slope on displacement/time graphs
Moving in positive direction
Negative slope on displacement/time graphs
Moving in negative direction
Zero slope on displacement/time graphs
State of rest