Physics Complete Syllabus Flashcards

Potential Difference word equation

Energy divided by Charge

Potential Difference Symbol equation

E / Q

* Word equation for density

Density = mass ÷ volume

* Symbol equation for density

ρ = m ÷ V

* Word equation for average speed

Average speed = total distance ÷ total time

* Symbol equation for speed (distance/time)

v = d ÷ t

* Word equation for acceleration

Acceleration = change in velocity ÷ time taken

* Symbol equation for acceleration

a = (v - u) ÷ t

* Word equation for weight

Weight = mass × gravitational field strength

* Symbol equation for weight

W = m × g

* Word equation for spring force

Spring force = spring constant × extension

* Symbol equation for spring force

F = k × x

* Word equation for resultant force

Resultant force = mass × acceleration

* Symbol equation for resultant force

F = m × a

* Word equation for kinetic energy

Kinetic energy = ½ × mass × speed²

* Symbol equation for kinetic energy

Eₖ = ½ m v²

* Word equation for change in gravitational potential energy

Change in grav. potential energy = mass × g × change in height

* Symbol equation for change in grav. potential energy

ΔEₚ = m × g × Δh

* Word equation for work done (force-distance)

Work done = force × distance moved in the direction of force

* Symbol equation for work done

W = F × d

* Word equation for power

Power = rate at which work is done

* Symbol equation for power

P = W ÷ t

* Word equation for pressure

Pressure = force ÷ area

* Symbol equation for pressure

p = F ÷ A

* Word equation for charge

Charge = current × time

* Symbol equation for charge

Q = I × t

* Word equation for potential difference (energy/charge)

Potential difference = energy ÷ charge

* Symbol equation for potential difference (energy/charge)

V = E ÷ Q

* Word equation for potential difference (Ohm's law)

Potential difference = current × resistance

* Symbol equation for potential difference (Ohm's law)

V = I × R

Energy Stores

kinetic, gravitational potential, chemical, elastic (strain), nuclear, electrostatic and internal (thermal)

Kinetic energy formula

E = 1/2m x v^2

Mechanical work equation

W = Fd

Efficiency equation

(useful energy output)/(total energy output) x 100

Power definition

W/t OR (change in)E/t

Charge is measured in

Coulombs (C)

Electric current definition

The charge passing a point per unit time

Current equation

I = Q/t

E.M.F. definition

The work done by one charge when moved around a complete circuit (in volts).

P.D. definition

The work done by a charge passing through a component.

E.M.F. equation

E = W/Q

P.D. equation

V = W/Q

Acceleration definition

Change in velocity per unit time

Weight definition

Weight is a gravitational force on an object that has mass

Gravity equation

g = W/m

Earth's gravitional field strength

9.8J per Kg

Spring constant definition

Force per unit extension

Spring constant equation

k = F/x

Force equation

F = ma

Resistance equation

R=V/I

Longer wire means _ resistance

higher

Wider wire means _ resistance

lower

Eletrical power equation

P = IV

Eletrical energy equation

E = ItV

Time definition (waves)

Amount of time for a singular wave to be produced

Frequency equation

1/T

Wave speed equation

v = fλ

Approximate range of frequencies audible to humans

20 Hz to 20 000 Hz

Speed of sound in air

330 - 350 m/s

Ultrasound is over _ kHz

20

Focal length definition

The distance from the centre of the lens to the principal focus (focal point)

Difference between partial magnets and permanent magnets

Permanent magnets remain indefinitely magnetised, whereas partial magnets only are magnetized within a magnetic field

How is the relative strength of a magnet found in a diagram?

The spacing between lines of a magnetic field

Unit for Time

Seconds