## 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 **second**.

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# igcse-edexcel-combined-double-solution

# igcse-edexcel-combined-double-solution

## Wave Speed

## Turning Moments

## Pressure

## Force, Mass and Acceleration

## Kinetic Energy

## Power

## Charge

## Resistance

## Electrical Power

## Density

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**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**.

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**.

**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/m ^{2}**.

An object of constant **mass** accelerates in proportion to the **force** applied.

In physics, the ** kinetic energy (KE)** of an object is the

The quantity **power** is the rate at which work is done. The quicker work is done the greater the **power**.

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

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

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.

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