Dynamics Flashcards
how do you calculate average velocity in the trolley problem?
entire length of journey divided by the total time taken
How do you calculate the instantaneous velocity in the trolley problem?
length of the mask divided by time taken for mask to pass through lightgate
how do you calculate average speed?
v = d/t
ave. speed = distance/time
how do you calculate instantaneous speed?
v = mask length/time taken
what is average speed/speed measured in?
ms -1
what is distance measured in?
m (metres)
what is time measured in?
s (seconds)
what is displacment represented as and measured in?
s and m(metres)
how do you calculate acceleration on a speed/time graph?
measure the gradient of the graph ( a = v-u/t )
how do you calculate displacment/distance on a speed time graph?
measure the area under the graph
how do you calculate speed/velocity on a speed time graph?
calculate area under the graph divided by the total time of the x axis
how do you calculate the work done?
Ew = Fd
work done = force x distance
how do you calculate potential energy?
Ep = mgh
potential energy = mass x gravitation field strength x height
how do you calculate kinetic energy?
Ek = 1/2 x mv squared
Kinetic energy = 1/2 x mass x velocity squared
what is velocity?
the change in displacment per unit of time
how do you calculate displacment?
s = vt
displacment = velocity x time
how do you calculate average velocity?
ave. vel. = s/t
average velocity = displacment/time
when does projectile motion occur?
when an object has both a constant horizontal velocity and a constant vertical acceleration
how do you calculate horizontal velocity?
v = dt
velocity = distance x time
how do you calculate vertical velocity?
v = u + at
velocity = initial v. + accel. x time
what is horizontal motion?
motion that goes at a constant velocity
how do you calculate horizontal distance?
Dh = Vh x t
horizontal distance =
horizontal vel. x time
what is vertical motion?
motion with a constant acceleration/increasing velocity
how do you calculate vertical distance?
measuring area under a speed/time graph
or
distance(height) = ave. speed x time
what is newton’s first law of motion?
an object will remain at rest or going at the same speed/direction unless acted on by an unbalanced force
what is newton’s second law of motion?
if mass remains constant, an object’s acceleration is directly proportional to the unbalanced force applied
what is newton’s third law of motion?
every action has an equal opposite reaction
what is terminal velocity?
the velocity something travels at when the forces acting on it are balanced
what are balanced forces?
equal forces going in opposite directions
how do you calculate unbalanced forces?
F = ma
force = mass x acceleration
