# AQA Synergy 1-9 – P1 & P2

### 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 second.

### 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 a given velocity.

### Specific Heat Capacity

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

### Power

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

### Elastic Potential Energy

Stretching or squashing an object can transfer energy into its elastic potential energy store.

### 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.

### Resistance

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

### Resistance in Series and Parallel

Resistors in series and in parallel can change the total resistance in a circuit.

### 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 circuit.

### Density

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

### Specific Latent Heat

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

### Half Life

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

### 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.

### Efficiency

The efficiency of a device is the proportion of input energy that is converted to useful energy.

### Energy Transformed

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

### 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.

### 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 the number of cycles of a wave that occur in one second.

### Magnification

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