Here you will find the most common physics equations and formulas used in high school and fundamental university courses. These include, but are not limited to, mechanics, kinematics, energy, uniform circular motion, and waves formulas.
For more physics formulas visit Wikipedia.
v̄  = 

v  = 

Where x is the displacement and t the time. The first equation gives the average velocity while the second equation is the instantaneous velocity
ā  = 

a  = 

Where v is the velocity and t the time. The first equation gives the average acceleration while the second equation is the instantaneous acceleration
F  = ma 
Where m is the mass of the object and a is the acceleration
w  = mg 
Where m is the mass and g is the gravitational acceleration. On earth, it is 9.8 m/s^{2}.
Δx = 

t 
Δx =  v_{0}t + 

at^{2} 
v^{2} = v_{0}^{2} + 2aΔx 
Δx  Displacement 
t  Time 
v_{0}  Initial Velocity 
v  Final Velocity 
a  Acceleration 
PE_{g} = mgh [Joules] 
Where m is the mass of the object, g is the gravitational constant 9.8 m/s2, and h is the height of the object
KE = 

mv^{2} [Joules] 
Where m is the mass of the object, v is the velocity of the object
PE_{x} = 

kx^{2} [Joules] 
Where k is the spring constant and x is the displacement
ω̄ = 

ω = 


ᾱ = 

α = 

Where theta is the angular displacement. The first equation gives the average angular velocity, while the second is the instantaneous angular velocity. The third equation gives the average angular acceleration, while the fourth is the instantaneous angular acceleration
v = ωr 
a = αxr  ω^{2}r 
The angular velocity ω can be converted into a linear velocity v with this equation where r is the radius.
The angular acceleration α can be converted into a linear acceleration a with this equation where r is the radius
τ = r x F 
Where F is the force acting in the direction of rotation, and r is the arm length
ƒ = 

Where T is the period of the wave
v =  λƒ 
Where λ is the wavelength and ƒ is the frequency
n_{1}θ = n_{2}θ 
Where n_{1} and n_{2} are the indices of refraction for the given mediums and θ_{1} is the angle of incidence and θ_{2} is the angle of refraction