physics exam 1

definition of scalar

how much (only a number and unit)

examples of scalar quantities

mass; speed; distance; time; temperature

mnemonic for examples of scalar quantities

(M)ake (S)ure (D)inner (T)astes (T)errific

definition of vector

how much and which direction (number, unit, & direction)

examples of vector quantities

acceleration; velocity; displacement; force

mnemonic for examples of vector quantities

(A) (V)ery (D)elicious (F)east

a constant rate of change of displacement means the velocity is

constant

velocity

speed and direction

acceleration

how quickly the speed changes (velocity over time)

speed

how fast an object is moving (distance over time)

if acceleration has the SAME sign as velocity, the object is

speeding up

if acceleration has an OPPOSITE sign from velocity, the object is

slowing down

if an object is moving to the right (think coordinate system), acceleration is

positive

if an object is moving to the left (think coordinate system), acceleration is

negative