PHYSICS FOR 7-11 CLASSES

Physics
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Clear explanations, real-life examples and tasks for grades 7-11. Everything to really understand physics.

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F = maa = Δv / Δt

Physics is logical

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FROM THE AUTHOR FIZIKZAUGLOM

“Physics is not a set of formulas that need to be memorized. It's a way to understand why the world around us works the way it does."

AlexanderTeacher of physics, mathematics and computer sciencePracticing teacher project · @teacher.phuket

Alexander, author fizikzauglom, physics teacher

All formulas

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48 from 48 quantities? Tap a highlighted symbol to see what it means

AMechanics

Acceleration

a\frac{\text{м}}{\text{с}^2}9 · 10 classUnit: metre per second squared

a=\frac{\left|v-v_0\right|}{t}9 class10 class

a_{\text{ц}}=\frac{v^2}{R}=\omega^2R9 class10 class

AMCT and thermodynamics

Amount of substance

\nu\text{моль}10 classUnit: mole

\nu=\frac{m}{M}10 class

\nu=\frac{N}{N_A}10 class

Conditions: The internal energy formula U = 3νRT/2 is given for a monatomic ideal gas.

AOscillations and waves

Amplitude

A,\ x_m\text{м}9 · 11 classUnit: meter

x=x_m\cos(\omega t)9 class11 class

q=q_m\cos(\omega t)11 class

AOscillations and waves

Angular frequency

\omega\text{с}^{-1}9 · 11 classUnit: second to the minus first power

\omega=\frac{2\pi}{T}9 class11 class

\omega=2\pi\nu9 class11 class

AMechanics

Angular velocity

\omega\frac{\text{рад}}{\text{с}}9 · 10 · 11 classUnit: radians per second

\omega=\frac{\varphi}{t}9 class10 class

\omega=2\pi\nu9 class10 class11 class

AMechanics

Apparent weight (force on a support)

P\text{Н}7 · 9 · 10 classUnit: newton

P=m(g\pm a)9 class10 class

P=N7 class9 class10 class

Conditions: The sign depends on the direction of acceleration; P = N for a body on a support without vertical acceleration.

CElectricity

Capacitance

C\text{Ф}10 · 11 classUnit: farad

C=\frac{q}{U}10 class

C=\varepsilon_0\varepsilon\frac{S}{d}10 class

CMechanics

Coefficient of friction

\mu\text{dimensionless}9 · 10 classUnit: dimensionless quantity

\mu=\frac{F_{\text{тр}}}{N}9 class10 class

F_{\text{тр}}=\mu N9 class10 class

DMechanics

Density

\rho\frac{\text{кг}}{\text{м}^3}7 · 10 classUnit: kilogram per cubic metre

\rho=\frac{m}{V}7 class

\rho=m_0n7 class10 class

DMechanics

Distance and path

S,\ l\text{м}7 · 9 · 10 classUnit: meter

S=vt7 class9 class10 class

S=\frac{v_0+v}{2}\,t9 class10 class

EMechanics

Efficiency

\eta\%7 · 8 · 10 classUnit: percentage

\eta=\frac{A_{\text{пол}}}{A_{\text{затр}}}7 class

\eta=\frac{Q_{\text{пол}}}{Q_{\text{затр}}}8 class10 class

EElectricity

Electric charge

q,\ Q\text{Кл}8 · 10 classUnit: coulomb

q=It8 class10 class

F=k\frac{\left|q_1q_2\right|}{\varepsilon r^2}8 class10 class

EElectricity

Electric current

I\text{А}8 · 10 classUnit: ampere

I=\frac{q}{t}8 class10 class

I=\frac{U}{R}8 class10 class

EElectricity

Electric field strength

E\frac{\text{В}}{\text{м}},\ \frac{\text{Н}}{\text{Кл}}8 · 10 classUnit: volt per meter, newton per coulomb

E=\frac{F}{q}8 class10 class

E=k\frac{\left|q\right|}{\varepsilon r^2}10 class

EElectricity

Electric potential

\varphi\text{В}10 classUnit: volt

\varphi=\frac{W_{\text{п}}}{q}10 class

\varphi=k\frac{q}{\varepsilon r}10 class

EElectricity

Electrical resistance

R\text{Ом}8 · 10 · 11 classUnit: ohm

R=\frac{U}{I}8 class10 class

R=\rho\frac{l}{S}8 class10 class

EElectricity

Electrical voltage

U\text{В}8 · 10 classUnit: volt

U=\frac{A}{q}8 class10 class

U=IR8 class10 class

EElectricity

Electromotive force

\mathcal{E}\text{В}10 · 11 classUnit: volt

\mathcal{E}=\frac{A_{\text{ст}}}{q}10 class

I=\frac{\mathcal{E}}{R+r}10 class

EMechanics

Energy

E,\ W\text{Дж}7 · 9 · 10 · 11 classUnit: joule

E_{\text{п}}=mgh7 class9 class10 class

E_{\text{к}}=\frac{mv^2}{2}7 class9 class10 class

EMechanics

Extension

\Delta l\text{м}7 · 9 · 10 classUnit: meter

\Delta l=l-l_07 class9 class10 class

F_{\text{упр}}=k\left|\Delta l\right|7 class9 class10 class

FOptics

Focal length

F\text{м}9 · 11 classUnit: meter

\frac{1}{F}=\frac{1}{d}+\frac{1}{f}9 class11 class

F=\frac{df}{d+f}9 class11 class

FMechanics

Force

F\text{Н}7 · 9 · 10 · 11 classUnit: newton

F=ma9 class10 class

F_{\text{упр}}=k\left|\Delta l\right|7 class9 class10 class

FOscillations and waves

Frequency

\nu\text{Гц}9 · 11 classUnit: hertz

\nu=\frac{n}{t}9 class11 class

\nu=\frac{1}{T}9 class11 class

HMCT and thermodynamics

Heat

Q\text{Дж}8 · 10 classUnit: joule

Q=mc\Delta t8 class10 class

Q=m\lambda8 class10 class

HMechanics

Height and depth

h\text{м}7 · 9 · 10 classUnit: meter

h=v_0t\pm\frac{gt^2}{2}9 class10 class

h=\frac{v^2-v_0^2}{\pm 2g}9 class10 class

IElectricity

Inductance

L\text{Гн}11 classUnit: henry

\mathcal{E}_{\text{си}}=L\frac{\left|\Delta I\right|}{\Delta t}11 class

T=2\pi\sqrt{LC}11 class

Conditions: n is the number of turns of the coil, Φ is the flux through one turn; nΦ - flux linkage. The connection is linear with constant inductance.

LOptics

Lens magnification

\Gamma\text{dimensionless}9 · 11 classUnit: dimensionless quantity

\Gamma=\frac{H}{h}9 class11 class

\Gamma=\frac{f}{d}9 class11 class

LOptics

Lens power

D\text{дптр}9 · 11 classUnit: diopter

D=\frac{1}{F}9 class11 class

D=\frac{1}{d}+\frac{1}{f}9 class11 class

MMagnetism

Magnetic flux

\Phi\text{Вб}8 · 11 classUnit: weber

\Phi=BS\cos\alpha8 class11 class

n\Phi=LI11 class

Conditions: The flux Φ is the same for all n turns. The energy formula refers to a constant inductance coil.

MMagnetism

Magnetic flux density

B\text{Тл}8 · 11 classUnit: tesla

B=\frac{F_m}{Il}8 class11 class

\Phi=BS\cos\alpha8 class11 class

MMechanics

Mass

m\text{кг}7 · 8 · 9 · 10 · 11 classUnit: kilogram

m=\rho V7 class

F=ma9 class10 class

MMechanics

Mechanical stress

\sigma\text{Па}10 classUnit: pascal

\sigma=\frac{F}{S}10 class

\sigma=E\left|\varepsilon\right|10 class

MMCT and thermodynamics

Molar mass

M\frac{\text{кг}}{\text{моль}}10 classUnit: kilogram per mole

M=M_r\cdot 10^{-3}\ \frac{\text{кг}}{\text{моль}}10 class

M=m_0N_A10 class

MMCT and thermodynamics

Molecular concentration

n\text{м}^{-3}7 · 10 classUnit: reciprocal cubic metre

n=\frac{N}{V}10 class

p=nkT10 class

MMechanics

Momentum

p\frac{\text{кг}\cdot\text{м}}{\text{с}}9 · 10 classUnit: kilogram metre per second

p=mv9 class10 class

F=\frac{\Delta p}{\Delta t}9 class10 class

Conditions: In the formulas for changing momentum, F is the average resultant force, and FΔt is the impulse of the force. The moment of force is denoted by M and is used to describe the rotational action of a force.

POscillations and waves