3.1 motion Flashcards
What is a scalar quantity?
Something that only has magnitude (e.g speed)
what is a vector quantity?
Has both magnitude (size) and has a specific direction
define speed
rate of change of distance
define velocity
rate of change of displacement
average velocity
velocity over a given time. v=s÷t
instantaneous velocity
velocity of an exact moment
define acceleration
rate of change of velocity
what is displacement
the distance between 2 fixed points in a given direction
what equations do you use for linear motion (horizontal or vertical)
suvat equations
what does the s stand for in suvat and what are its units
s = displacement = meters
what does the u stand for in suvat and what are its units
u = initial velocity = ms⁻¹
what does the v stand for in suvat and what are its units
v = final velocity = ms⁻¹
what does the a stand for in suvat and what are its units
a = acceleration = ms⁻²
what does the t stand for in suvat and what are its units
t = time = seconds
what speed to all objects one Earth fall at (provided there are no other forces)
9.81 or -9.81
what can 9.81 be used for in free fall calculations (when air resistance is negligable)
acceleration
what condition has to be met for suvat equations to be used
no other forces acting (air resistance and drag)
what is a projectile
an object where the only force acting on it is gravity
in the horizontal of projectile motion (horizontal suvat) what is acceleration always
0
in the horizontal of projectile motion (horizontal suvat) what is the rule for u and v (initial and final velocity)
they are the same as there is no acceleration
in the vertical of projectile motion (vertical suvat) what is acceleration always
-9.81
in the vertical of projectile motion (vertical suvat) what is the rule for u and v (initial and final velocity)
v = -u
what is always the same in both vertical and horizontal suvat
time
