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44 results for “force”

Formulae (44)

Newton's Second Law

F = ma

Force equals mass times acceleration.

Work Done

W = F d \cos\theta

Work done by a force over a distance.

PhysicsIntermediate

Impulse

J = F\Delta t = \Delta p

Change in momentum from a force over time.

PhysicsAdvanced

Coulomb's Law

F = k\frac{q_1 q_2}{r^2}

Electrostatic force between two charges.

PhysicsIntermediate

Newton's Gravitation

F = G\frac{m_1 m_2}{r^2}

Attractive force between two masses.

PhysicsIntermediate

Hooke's Law

F = -kx

Restoring force of a spring.

PhysicsAdvanced

Centripetal Force

F = \frac{mv^2}{r}

Force needed to keep an object in circular motion.

Pressure

P = \frac{F}{A}

Force per unit area.

Weight

W = mg

The gravitational force on a mass.

Mechanical Advantage

MA = \frac{F_{out}}{F_{in}}

Force amplification of a simple machine.

Weight

W = mg

Gravitational force on a mass near Earth.

Hooke Law

F = -kx

Restoring force of a spring proportional to displacement.

PhysicsIntermediate

Impulse

J = F\Delta t = \Delta p

Change in momentum from a force over time.

PhysicsIntermediate

Torque

\tau = rF\sin\theta

Rotational effect of a force about a pivot.

Friction Force

f = \mu N

Resistive force between surfaces.

PhysicsIntermediate

Centripetal Force

F = \frac{mv^2}{r}

Inward force needed for circular motion.

Physics Laws & TheoremsBasic

Newton's First Law (Inertia)

\sum F = 0 \Rightarrow v = \text{const}

An object stays at rest or in uniform motion unless acted on by a net force.

Physics Laws & TheoremsBasic

Newton's Second Law

F = ma = \frac{dp}{dt}

Net force equals mass times acceleration (rate of change of momentum).

Physics Laws & TheoremsIntermediate

Archimedes' Principle

F_b = \rho g V

Buoyant force equals the weight of fluid displaced.

Physics Laws & TheoremsBasic

Hooke's Law

F = -kx

The restoring force of a spring is proportional to its extension.

Physics Laws & TheoremsIntermediate

Coulomb's Law

F = k\frac{q_1 q_2}{r^2}

Electrostatic force between two point charges.

Physics Laws & TheoremsAdvanced

Faraday's Law of Induction

\varepsilon = -\frac{d\Phi_B}{dt}

A changing magnetic flux induces an electromotive force.

Physics Laws & TheoremsIntermediate

Conservation of Momentum

\sum p_i = \sum p_f

Total momentum is conserved without external forces.

Physics Laws & TheoremsBasic

Hooke Law

F = -kx

Elastic restoring force is proportional to displacement.

Physics Laws & TheoremsIntermediate

Archimedes Principle

F_b = \rho V g

Buoyant force equals the weight of displaced fluid.

Electricity & MagnetismIntermediate

Coulomb's Law

F = k\frac{q_1 q_2}{r^2}

Force between two point charges.

Electricity & MagnetismBasic

Electric Field

E = \frac{F}{q}

Force per unit charge at a point.

Electricity & MagnetismIntermediate

Magnetic Force on a Charge

F = qvB\sin\theta

Force on a moving charge in a magnetic field.

Electricity & MagnetismIntermediate

Force on a Current Wire

F = BIL\sin\theta

Force on a current-carrying conductor.

Fluid MechanicsBasic

Pressure

P = \frac{F}{A}

Force per unit area.

Fluid MechanicsIntermediate

Archimedes' Principle

F_b = \rho g V

Buoyant force equals weight of displaced fluid.

Fluid MechanicsIntermediate

Surface Tension

\gamma = \frac{F}{L}

Force per unit length along a liquid surface.

Fluid MechanicsAdvanced

Drag Force

F_D = \tfrac{1}{2}\rho v^2 C_D A

Aerodynamic drag on a moving body.

Astronomy & SpaceIntermediate

Newton's Law of Gravitation

F = G\frac{m_1 m_2}{r^2}

The attractive force between any two masses.

EngineeringBasic

Stress

\sigma = \frac{F}{A}

Internal force per unit area in a material.

EngineeringIntermediate

Torque

\tau = r F \sin\theta

Rotational force about a pivot.

EngineeringBasic

Mechanical Advantage

MA = \frac{F_{out}}{F_{in}}

Force amplification of a machine.

Materials & CivilBasic

Stress

\sigma = \frac{F}{A}

Internal force per unit cross-sectional area.

Aviation & AeronauticsIntermediate

Drag Equation

D = \tfrac{1}{2}\rho v^2 S C_D

Aerodynamic drag force on the aircraft, analogous to lift with a drag coefficient.

Aviation & AeronauticsIntermediate

Load Factor in a Turn

n = \dfrac{1}{\cos\phi}

The g-load in a level, coordinated turn depends only on the bank angle.

Aviation & AeronauticsAdvanced

Reynolds Number

Re = \dfrac{\rho v L}{\mu}

Ratio of inertial to viscous forces; characterises airflow over an airfoil.

Aviation & AeronauticsIntermediate

Load Factor

n = \frac{L}{W}

Ratio of lift to weight, felt as g-force.

Unemployment Rate

u = \dfrac{Unemployed}{Labor\ Force}\times 100\%

The share of the labor force that is jobless and actively seeking work.

Unemployment Rate

u = \frac{\text{Unemployed}}{\text{Labor Force}}\times 100

Fraction of the labor force without work.