Concepts (E1) Flashcards
scalar
-a quantity
-can add (with same units) and multiply by other scalars
ex. temperature, speed, volume
vector
-magnitude and direction
-changes with change in magnitude and/or direction
-can add (with same units) and multiply by other vectors
ex. force, velocity, acceleration
What mathematical functions can you do with scalars & vectors?
CAN: multiply
CANNOT: add
Force
mass x acceleration
newton (N) (1 kg/m/s^2)
Work
mass x acceleration x distance/displacement
joule (J) (kg/m^2/s^2)
Power
work / time
watt (W) (J/s)
Potential energy
-work performed stored
-energy associated with the position of an object
force x height
gravity: mgh (mass x gravity x height)
Kinetic energy
-energy associated with the motion of an object
1/2mv^2
Distance
scalar quantity
value >=0
Displacement
vector quantity
positive or negative values
x(initial) - x(final)
Speed
scalar quantity
value >=0
distance / time
Velocity
vector quantity
positive or negative values
x(final) - x(initial) / time
Acceleration
vector quantity
positive or negative values
+: getting faster
-: getting slower
v(final) - v(initial) / time
Mass
scalar
intrinsic property of an object
ex. gm, kg, slug
Weight
scalar
effect of gravitational force on an object
ex. N, lbs, kg
