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Scalar & Vector Quantities

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A physical quantity is something that can be measured. Scalar quantities only have a or size.

Examples of scalar quantities

Some examples of scalar quantities include:

temperature, eg 10 degrees Celsius (°C)

mass, eg 5 kilograms (kg)

energy, eg 2,000 joules (J)

distance, eg 19 metres (m)

speed, eg 8 metres per second (m/s)

density, eg 1,500 kilograms per metre cubed (kg/m³)

Calculations involving scalar quantities

Adding scalars

The sum of scalar quantities can be found by adding their values together.

Calculate the total mass of a 75 kg climber carrying a 15 kg backpack.

75 kg + 15 kg = 90 kg

Subtracting scalars

Scalar quantities can be subtracted by subtracting one value from another.

A room is heated from 12°C to 21°C using a radiator. Calculate the increase in temperature.

21°C - 12°C = 9°C

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Scalar quantities - Scalar and vector quantities - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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A physical quantity is something that can be measured. Scalar quantities only have a or size. Some examples of scalar quantities include: temperature, eg 10 degrees Celsius (°C) mass, eg 5 kilograms (kg) energy, eg 2,000 joules (J) distance, eg 19 metres (m) speed, eg 8 metres per second (m/s) density, eg 1,500 kilograms per metre cubed (kg/m³) The sum of scalar quantities can be found by adding their values together.

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Contact & Non-contact Forces

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Contact forces - Contact and non-contact forces - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise contact and non-contact forces with GCSE Bitesize Physics.

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Gravity

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Weight is the force acting on an object due to gravity - it has the unit newtons (N) and acts towards the centre of a gravitational field. The weight of an object can be measured using a calibrated spring-balance, often called a Newton meter.

Weight is a because gravity exerts its force through a field. An object does not need to be touching the Earth to have a weight.

Gravitational field strength ( ) is measured in newtons per kilogram (N/kg). The Earth's gravitational field strength is 9.8 N/kg. This means that for each kg of mass, an object will experience 9.8 N of force.

Where there is a weaker gravitational field, the weight of an object is smaller. For example, the gravitational field strength of the Moon is 1.6 N/kg. This means that for each kg of mass, an object will experience 1.6 N of force. Therefore, an astronaut will weigh less on the Moon than they do on the Earth.

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Gravitational fields - Gravity - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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Weight is the force acting on an object due to gravity - it has the unit newtons (N) and acts towards the centre of a gravitational field. The weight of an object can be measured using a calibrated spring-balance, often called a Newton meter. Weight is a because gravity exerts its force through a field.

# data[].attributes.body
Scalar & Vector Quanitities

# data[].attributes.attachment_link.readable_text
A physical quantity is something that can be measured. Scalar quantities only have a or size.

Examples of scalar quantities

Some examples of scalar quantities include:

temperature, eg 10 degrees Celsius (°C)

mass, eg 5 kilograms (kg)

energy, eg 2,000 joules (J)

distance, eg 19 metres (m)

speed, eg 8 metres per second (m/s)

density, eg 1,500 kilograms per metre cubed (kg/m³)

Calculations involving scalar quantities

Adding scalars

The sum of scalar quantities can be found by adding their values together.

Calculate the total mass of a 75 kg climber carrying a 15 kg backpack.

75 kg + 15 kg = 90 kg

Subtracting scalars

Scalar quantities can be subtracted by subtracting one value from another.

A room is heated from 12°C to 21°C using a radiator. Calculate the increase in temperature.

21°C - 12°C = 9°C

# data[].attributes.attachment_link.title
Scalar quantities - Scalar and vector quantities - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
A physical quantity is something that can be measured. Scalar quantities only have a or size. Some examples of scalar quantities include: temperature, eg 10 degrees Celsius (°C) mass, eg 5 kilograms (kg) energy, eg 2,000 joules (J) distance, eg 19 metres (m) speed, eg 8 metres per second (m/s) density, eg 1,500 kilograms per metre cubed (kg/m³) The sum of scalar quantities can be found by adding their values together.

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Contact & Non-Forces

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Contact forces - Contact and non-contact forces - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

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Learn about and revise contact and non-contact forces with GCSE Bitesize Combined Science.

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Gravity

# data[].attributes.attachment_link.readable_text
Weight is the force acting on an object due to gravity - it has the unit newtons (N) and acts towards the centre of a gravitational field. The weight of an object can be measured using a calibrated spring-balance, often called a Newton meter.

Weight is a because gravity exerts its force through a field. An object does not need to be touching the Earth to have a weight.

Gravitational field strength ( ) is measured in newtons per kilogram (N/kg). The Earth's gravitational field strength is 9.8 N/kg. This means that for each kg of mass, an object will experience 9.8 N of force.

Where there is a weaker gravitational field, the weight of an object is smaller. For example, the gravitational field strength of the Moon is 1.6 N/kg. This means that for each kg of mass, an object will experience 1.6 N of force. Therefore, an astronaut will weigh less on the Moon than they do on the Earth.

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Gravity - Gravity - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Weight is the force acting on an object due to gravity - it has the unit newtons (N) and acts towards the centre of a gravitational field. The weight of an object can be measured using a calibrated spring-balance, often called a Newton meter. Weight is a because gravity exerts its force through a field.