VECTORS Flashcards
how do we find the sum of two vectors
you have to find the resultant vector
what does theta tell us with 2-D vectors?
it tells us the direction
what happens when we multiply a vector by a scalar?
we get another vector with a different magnitude but the same direction
What happens if we multiply a vector by a negative number?
The direction changes
when subtracting vector A-B what do we do?
we have to flip the direction of B and place the tail of B at the tip of A
in 2-D motion, what type of quanitity is the displacement?
it is a vector
what is the velocity vector?
it is the displacement vector divided by the change in time
what direction does a velocity vector point?
it points in the direction of the displacement
what is considered a change in velocity
when the magnitude changes, the speed changes
the direction of the motion can change and this is a change in velocity
when is there acceleration?
whenever there is a change in velocity
what are vector components
they are components of a vector that can be broken up into the x and y components
how do you specify a vector?
you need the degrees and a specific language (north, south, east, west, north of west, clockwise)
how do you draw north of west
start with second word and go north from there
for two objects in freefall, what can we say about their graphs?
since they have the same acceleration, the graphs will have the same slopes and will be straight line graphs
how is velocity different from speed
velocity indicates a direction
Once you have selected a coordinate system, you can express a two-dimensional vector using a pair of quantities known collectively as
components
For circular motion, which way does the acceleration vector point?
it points towards the center
