Topic 1 - Key Concepts Of Phsyics - Equations To Learn Flashcards
Define the distance equation
Distance = speed x time
Define acceleration as an equation
A = ( v - u)
———
T
V = final velocity
u = initial velocity
T = time
( v - u ) = change in velocity
Define the force equation in words
Force = mass x acceleration
Define the weight equation
W = m x g
Define the GPE equation and what does GPE stand for
1) GPE = m x g x h
2) gravitational potential energy
What is the kinetic energy (KE) equation
KE = 1/2 x m x v2
Define the efficiency equation
Efficiency = usefully energy output
———————————
Total energy input
What are the 2 wave equations
1)Wave length v = X
—
T
2) wave speed = v = f x λ
Define the work done equation
Work done = force x distance( moved in the direction of the force)
Define the power equation
Power = work done
—————-
Time
What is the moment of force equation
Moment of force = force x perpendicular distance
What is the energy transferred equation
Energy transferred = charge moved x pd
Define charge in equation form
Current x time
What is the voltage equation
Voltage = current x resistance
What are the 2 electrical power equations
1) Electrical power = current x pd
2) electrical power = current² x resistance
What is the density equation
Density = mass
———
Volume
Define the force in spring equation
Spring constant x extension
What is the energy transferred equation in circuits
Energy transferred = I x V x T
What is the equation relating the primary and secondary voltage in a transformer?
Vp / Vs = Np / Ns
Vp = voltage across primary, Vs = voltage across secondary, Np = number of turns in primary, Ns = number of turns in secondary.
What is the relationship between power in primary and secondary circuits?
Power of primary = Power of secondary = Vp X Ip = Vs X Is
Ip = current in primary, Is = current in secondary.
What is the formula for change in energy?
Change in energy = mass X specific heat capacity * temp change
This can also be expressed as 4Q = mc0.
How is energy related to mass and latent heat?
Energy = mass X specific latent heat = Q = ml
Q represents the energy transferred during a phase change.
What is the equation for pressure and volume change?
P1V1 = P2V2
This equation is derived from the ideal gas law.
What is the expression for energy transferred in relation to k and x?
Energy transferred = k(4x)²
Here, k is a constant and x represents a variable related to the system.
What is the equation of motion relating initial and final velocities?
v² - u² = 2as
v = final velocity, u = initial velocity, a = acceleration, s = distance.
What is the formula for force on a conductor in a magnetic field?
Force = magnetic flux density x current x length = F = BIl
B = magnetic flux density, I = current, l = length of conductor.
How is pressure from a liquid calculated?
Pressure = height of column x density of liquid x gravity = P = hpg
h = height, p = density, g = acceleration due to gravity.
What is the formula for momentum?
Momentum = p = mv
p = momentum, m = mass, v = velocity.
What does F = (mv - mu) / t represent?
It represents the average force exerted during a change in momentum over time.
F = force, m = mass, v = final velocity, u = initial velocity, t = time.
