#### Pressure in a Gas

Gas Pressure is created when gas particles collide with the walls of their container. The more often the particles collide with the walls, and the faster they are moving, the greater the pressure….

#### Wave Speed

Wave speed is given in meters per second (the number of waves that pass per second). Wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per…

#### Turning Moments

The size of the turning effect is called a turning moment. As Newton’s first law of motion states, an object will remain at rest if the forces are balanced. When…

#### Moments

Forces can cause an object to rotate and the turning effect of the force is called a moment. If a resultant force acts on an object about a fixed turning point called the pivot or…

#### Force on a Spring

When a force acts on a spring it is stretched or compressed, its length will changes by an amount e from its original length. Demo In this tutorial you will learn how…

#### Pressure

Pressure can be calculated if you know the force applied to or by an object and the contact area. The units are newtons per square meter, or N/m2. Demo In this…

#### Force, Mass and Acceleration

An object of constant mass accelerates in proportion to the force applied. Demo In this tutorial you will learn how to calculate the force applied to an object if you are given its mass…

#### Kinetic Energy

In physics, the kinetic energy (KE) of an object is the energy that it has due to its motion. It is defined as the work needed for an object of a known mass to accelerate to…

#### Specific Heat Capacity

Specific heat capacity is how much heat energy is required to raise 1 kg of a substance by 1 Â°C. What is Specific heat capacity? Specific heat capacity is how…

#### Power

The quantity power is the rate at which work is done. The quicker work is done the greater the power. What is Power? The quantity power is the rate at…

#### Elastic Potential Energy

Stretching or squashing an object can transfer energy into its elastic potential energy store. What is Elastic potential energy? Stretching or squashing an object can transfer energy into its elastic…

#### Charge

The size of the current is the rate of flow of charge. Electrons are negatively charged particles which transfer energy through wires as electricity. What is Charge? The size of…

#### Resistance

Resistance is an electrical quantity that measures how a device or material reduces the electrical current flow through it. What is Resistance? Resistance is an electrical quantity that measures how…

#### Resistance in Series and Parallel

Resistors in series and in parallel can change the total resistance in a circuit. What is Resistance in series and parallel? Resistors in series and in parallel change the total…

#### Electrical Power

The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time at which electrical energy is transferred by an electric…

#### Density

Density is a measure of how compact the particles are in a substance. Density is defined as the mass per unit volume. What is Density Density is a measure of how…

#### Specific Latent Heat

Specific latent heat is the energy needed to change the state of a substance. What is Specific latent heat? Specific latent heat is the energy needed to change the state…

#### Half Life

The radioactivity of a sample decreases over time. Half life is a measurement of this decrease. What is Half life? The radioactivity of a sample decreases over time. Half life…

#### Gravitational Potential Energy

Lifting an object in a gravitational field transfers energy into the objects gravitational energy store. Gravitational potential energy is the energy an object has due to its height above Earth. What is Gravitational…

#### Efficiency

The efficiency of a device is the proportion of input energy that is converted to useful energy. What is Efficiency? The efficiency of a device is the proportion of input…

#### Energy Transformed

The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device. What is Energy transformed? The potential difference between two…

#### Forces and Work Done

The unit for work done is the joule (J), or Newton meter (N-m). One joule is equal to the amount of work that is done when 1 N of force moves an object over a distance of 1 m. Demo…

#### Momentum

All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the same. Car safety features absorb energy…

#### Change in Momentum

All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the same. Car safety features absorb energy…

#### Wave Period

The period of a wave is the time it takes to complete one cycle. The unit for a wave period is seconds, and it is inversely proportional to the frequency of a wave, which is…

#### Transformers

A transformer is an piece of electrical apparatus which will increase or decrease the voltage in an alternating current. It can be designed to “step up” or “step down” voltages and is based on…

#### The Motor Effect

A current-carrying wire or coil can exert a force on a permanent magnet. The force increases if the strength of the magnetic field and/or current increases. This is called the motor effect. Demo In this tutorial…

#### Magnification

The magnification can be calculated if you know the actual size of the object and its image size. Demo In this tutorial you will learn how to calculate the magnification of objects…

#### Uniform Acceleration

Uniform or constant acceleration is a type of motion in which the velocity of an object changes by an equal amount in every equal time period. Demo In this tutorial you will learn…

#### Pressure in Fluids

Fluid pressure is exerted on the surface of an object in a liquid. This pressure causes upthrust . An object placed in a liquid will begin to sink. As it sinks, the liquid pressure on it…

#### Acceleration

Acceleration is how quickly the velocity is changing whether it be speed, direction or both. Acceleration is a measure of how quickly the velocity of an object is changing. Demo…

#### Speed

Speed is how fast an object is moving in no given direction. Velocity is how fast an object is moving in a given direction. In physics, you can calculate the average speed by taking the…

#### Weight on the Moon

Weight is the force acting on an object due to gravity. The weight of an object is defined as the force of gravity on the object and can be calculated as the…

#### Weight on Earth

Weight is the force acting on an object due to gravity. The weight of an object can be defined as the force of gravity on the object. Since the weight is a force, its…