Topic 1 - Key Concepts Of Phsyics - Equations To Learn

Question 1

Define the distance equation

Answer 1

Distance = speed x time

Question 2

Define acceleration as an equation

Answer 2

A = ( v - u)
———
T
V = final velocity
u = initial velocity
T = time

( v - u ) = change in velocity

Question 3

Define the force equation in words

Answer 3

Force = mass x acceleration

Question 4

Define the weight equation

Answer 4

W = m x g

Question 5

Define the GPE equation and what does GPE stand for

Answer 5

1) GPE = m x g x h

2) gravitational potential energy

Question 6

What is the kinetic energy (KE) equation

Answer 6

KE = 1/2 x m x v2

Question 7

Define the efficiency equation

Answer 7

Efficiency = usefully energy output
———————————
Total energy input

Question 8

What are the 2 wave equations

Answer 8

1)Wave length v = X
—
T

2) wave speed = v = f x λ

Question 9

Define the work done equation

Answer 9

Work done = force x distance( moved in the direction of the force)

Question 10

Define the power equation

Answer 10

Power = work done
—————-
Time

Question 11

What is the moment of force equation

Answer 11

Moment of force = force x perpendicular distance

Question 12

What is the energy transferred equation

Answer 12

Energy transferred = charge moved x pd

Question 13

Define charge in equation form

Answer 13

Current x time

Question 14

What is the voltage equation

Answer 14

Voltage = current x resistance

Question 15

What are the 2 electrical power equations

Answer 15

1) Electrical power = current x pd

2) electrical power = current² x resistance

Question 16

What is the density equation

Answer 16

Density = mass
———
Volume

Question 17

Define the force in spring equation

Answer 17

Spring constant x extension

Question 18

What is the energy transferred equation in circuits

Answer 18

Energy transferred = I x V x T

Question 19

What is the equation relating the primary and secondary voltage in a transformer?

Answer 19

Vp / Vs = Np / Ns

Vp = voltage across primary, Vs = voltage across secondary, Np = number of turns in primary, Ns = number of turns in secondary.

Question 20

What is the relationship between power in primary and secondary circuits?

Answer 20

Power of primary = Power of secondary = Vp X Ip = Vs X Is

Ip = current in primary, Is = current in secondary.

Question 21

What is the formula for change in energy?

Answer 21

Change in energy = mass X specific heat capacity * temp change

This can also be expressed as 4Q = mc0.

Question 22

How is energy related to mass and latent heat?

Answer 22

Energy = mass X specific latent heat = Q = ml

Q represents the energy transferred during a phase change.

Question 23

What is the equation for pressure and volume change?

Answer 23

P1V1 = P2V2

This equation is derived from the ideal gas law.

Question 24

What is the expression for energy transferred in relation to k and x?

Answer 24

Energy transferred = k(4x)²

Here, k is a constant and x represents a variable related to the system.

Question 25

What is the equation of motion relating initial and final velocities?

Answer 25

v² - u² = 2as ## Footnote v = final velocity, u = initial velocity, a = acceleration, s = distance.

Question 26

What is the formula for force on a conductor in a magnetic field?

Answer 26

Force = magnetic flux density x current x length = F = BIl ## Footnote B = magnetic flux density, I = current, l = length of conductor.

Question 27

How is pressure from a liquid calculated?

Answer 27

Pressure = height of column x density of liquid x gravity = P = hpg ## Footnote h = height, p = density, g = acceleration due to gravity.

Question 28

What is the formula for momentum?

Answer 28

Momentum = p = mv ## Footnote p = momentum, m = mass, v = velocity.

Question 29

What does F = (mv - mu) / t represent?

Answer 29

It represents the average force exerted during a change in momentum over time. ## Footnote F = force, m = mass, v = final velocity, u = initial velocity, t = time.