Physics Flashcards
Area under a force time graph is
impulse
Area under a force displacement graph is
Work
Work is equal to…
Fs or ΔKinetic Energy
Stopping distance equals
reaction distance plus breaking distance
s (displacement) equals
ut +(at^2)/2
v^2 equals
u^2 +2as
v equals
u + at
v equals (only in freefall)
root 2gh
A nucleon is…
either a proton or neutron
the refractive index of air is…
1
Half life equal
N =No x (1/2)^n
N-> half life
No-> number of nuclides initially
n=t/to
t-> time elapsed
->time of the half life
magnification equals
m=height of image/height of object = distance of image/distance of object
->m= hi/ho= di/do
Work equals
W=Fs=Ft=Δp=ΔKe=Q
Power equals
W/s or VI (power connects work and circuits)
Frequency is
1/T and always constant
Period is
1/f or wavelenght/velocity
Calculating refractive index is
n (refractive index)= c (speed fo light)/ v (speed of light inside the material investigated
Hooke’s Law
the force applied to a string is proportional to its stretch
Zeroth Law of Thermodynamics
if two objects in thermal equilibrium are in contact with a third object, then the third object must also be in equilibrium
1st Law of Thermodynamics
Within a closed system, energy cannot be created or destroyed, but can be transferred
-Q loss = Q gain
2nd law of thermodynamics
the entropy (disorder) of a system always increases
3rd law of thermodynamics
entropy always reaches some constant
Electron Volts are
the work required to move on electron through one volt of potential difference
used in atomic physics
Binding Energy is
the amount of energy used to pull protons, neutrons and electrons together
The strong nuclear force
overcomes the repulsion between protons, and binds neutrons and protons together
the strong nuclear force is
the strongest force
If a wave goes into a denser medium
it refracts away from the normal and moves faster
e.g a sound wave
if a wave goes into a less dense medium
it refracts towards the normal and is slower
