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. … Pressure in a GasRead More »

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 second. … Wave SpeedRead More »

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 the sum of the forces add to zero, a body will remain at rest or move at a constant velocity. … Turning MomentsRead More »

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 fulcrum it will cause the object to rotate e.g. using a spanner, a screwdriver, opening a door hanging on hinges. … MomentsRead More »

When a force acts on a spring it is stretched or compressed, its length will changes by an amount e from its original length. … Force on a SpringRead More »

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. … PressureRead More »

An object of constant mass accelerates in proportion to the force applied. … Force, Mass and AccelerationRead More »

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 a given velocity. … Kinetic EnergyRead More »

Specific heat capacity is how much heat energy is required to raise 1 kg of a substance by 1 °C. … Specific Heat CapacityRead More »

The quantity power is the rate at which work is done. The quicker work is done the greater the power. … PowerRead More »

Stretching or squashing an object can transfer energy into its elastic potential energy store. … Elastic Potential EnergyRead More »

The size of the current is the rate of flow of charge. Electrons are negatively charged particles which transfer energy through wires as electricity. … ChargeRead More »

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

Resistors in series and in parallel can change the total resistance in a circuit. … Resistance in Series and ParallelRead More »

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 circuit. … Electrical PowerRead More »

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

Specific latent heat is the energy needed to change the state of a substance. … Specific Latent HeatRead More »

The radioactivity of a sample decreases over time. Half life is a measurement of this decrease. … Half LifeRead More »

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. … Gravitational Potential EnergyRead More »

The efficiency of a device is the proportion of input energy that is converted to useful energy. … EfficiencyRead More »

The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device. … Energy TransformedRead More »

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. … Forces and Work DoneRead More »

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 involved in a crash they slow down the collision thus reducing the force of impact. … MomentumRead More »

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 involved in a crash they slow down the collision thus reducing the force of impact. … Change in MomentumRead More »

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 the number of cycles of a wave that occur in one second. … Wave PeriodRead More »

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 magnetic induction principle. … TransformersRead More »

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. … The Motor EffectRead More »

The magnification can be calculated if you know the actual size of the object and its image size. … MagnificationRead More »

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. … Uniform AccelerationRead More »

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 increases and so the upthrust increases. … Pressure in FluidsRead More »

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. … AccelerationRead More »

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 total distance travelled and dividing it by the total time required to travel that distance. … SpeedRead More »

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 mass times the acceleration due to gravity. … Weight on the MoonRead More »

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 unit is the Newton. … Weight on EarthRead More »