mechanics Flashcards
what is a vector
a physical quantity which has both magnitude and direction
what is a scalar
a physical quantity which has magnitude only
what is a bearing
measured clockwise from north
what is a resultant
is the single vector that has the same effect as all the component vectors together would have
what is the maximum resultant
1)it is obtained when two vectors act in the same direction.
2)the angle between them is 0 degrees.
3)the resultant sum is then the sum of the magnitudes of the two vectors.
what is the minimum resultant
1) is obtained when two vectors act in the opposite direction
2) the angle between them is 180 degrees
3)the resultant is then the difference of the magnitudes of the vectors
what is position (x)
the SI unit for position
the reference point
m
what is distance (d)
SI unit for distance
distance from one position to another is the length of the path actually taken
m
what is displacement (Δx)
SI unit for displacement
displacement is a body’s change of position
m
what is speed (v)
SI unit for speed
is the rate of change of distance moved
m.s-1 or m/s
what is instantaneous speed
instantaneous speed is the speed at a particular moment
what is instantaneous speed
instantaneous speed is the speed at a particular moment
what is velocity (v)
SI unit for velocity
the rate of change of position
m.s-1 or m/s
what is instantaneous velocity
the velocity at a particular moment
how do we convert km.h-1 to m.s-1
divide 3,6
what is acceleration (a)
SI unit for acceleration
the rate of change of velocity.
m.s-2
what scalar quantities
Distance
Mass
Speed
Time
what is a vector quantity
Displacement
Weights
Velocity
Acceleration
draw a basic Position vs Time graph pg121
draw a positive acceleration graph pg121
what does it mean
it means that the velocity is increasing
draw a negative acceleration graph pg121
what does it mean
it means that the velocity is decreasing
draw a basic Velocity vs Time graph pg123
-explain the increasing decreasing of velocity
positive velocity -the gradient increases
negative velocity- the gradient decreases
