Mechanics Flashcards
SUVAT
v=u+at
s=(u+v)/2 t
v^2=u^2+2sa
s=ut+0.5at^2
velocity
the rate of change of displacement
acceleration
the rate of change of velocity
displacement
average velocity*time
change in velocity
acceleration*time
terminal velocity
forces are balanced (no resultant force)
weight never changes
surface area presented + velocity affect it
relative velocity
speed of an object from a perspective
fundamental forces
nuclear strong force
nuclear weak force
gravity (weakest)
electromagnetic (all others observed)
newton’s 3rd law
all forces are interactions between objects
(same magnitude of force in opposite directions
same type of force)
Newton’s first law
if there is no resultant force, there will not be a change in velocity
Newton’s second law
F=ma
linear momentum
=m*v (kgms^-1)
conservation of momentum
impulse
sudden change in momentum for an object/ the force on an object and the time it is applied (kgms^-1)
Impulse=dP=forcetime
=mdv
Work done
force*distance
FSCosΘ
(if energy gained, positive and vice versa)
Power
work done in 1 s
dW/dt=F(ds/t) P=Fv
