Energy and motion Flashcards
what is the difference between speed and velocity?
speed: scalar quantity with magnitude
velocity: vector quantity with magnitude and DIRECTION
formula for speed
distance/time
what does the gradient represent on a distance-time graph?
speed
what does a horizontal line represent on a distance-time graph?
stationary
formula for velocity
displacement of time
what does the gradient represent on a velocity-time graph?
acceleration
what does the area below line represent on a velocity-time graph?
total distance travelled
what does a horizontal line represent on a velocity-time graph?
constant speed
formula for acceleration and its units
change in velocity/time
unit: m/s^2
newton’s 1st law
- zero resultant force - object remain stationary
- forces are balanced: constant velocity
newton’s 2nd law
f=ma
newton’s 3rd law
for every action, there is an equal and opposite reaction
what type of quantity is momentum?
vector quantity
formula for momentum
mass x velocity
units for momentum
kg m/s
