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In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on.

After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

This is now known as the Law of Conservation of Energy which means that energy doesn't appear or disappear.

Energy can be transferred between different stores of energy.
the total energy stored before = total energy stored after.
For example:

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In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on. After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

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Use this knowledge organiser to produce a set of flash cards on the key words and definitions.
Produce a mind-map on the essential knowledge
Follow the links to carry out further reading in this subject area.

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Energy is usually measured in joules (J). One joule of energy is transferred to a one watt device used for one second.

\(Energy~transferred = power \times time\)

\(1~J = 1~W \times 1~s\)

However energy companies use a different unit called kilowatt hours (kWh).

Appliances are usually used for long periods of time so very large amounts of energy are transferred.

1 kWh is the amount of energy transferred to a 1kW appliance in 1 hour.

\(Energy~transferred = power \times time\)

\(1~kWh = 1~kW \times 1~h\)

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Energy is used in the home to power domestic appliances. Find out more with BBC Bitesize. For students between the ages of 11 and 14. Find out more with BBC Bitesize. For students between the ages of 11 and 14.

# data[].attributes.attachment_link.readable_text
In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on.

After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

This is now known as the Law of Conservation of Energy which means that energy doesn't appear or disappear.

Energy can be transferred between different stores of energy.
the total energy stored before = total energy stored after.
For example:

# data[].attributes.attachment_link.description
In the 18th century the French philosopher, Émilie du Châtelet, did an experiment. She dropped a number of balls from different heights then observed how they fell and their impact with the surface they landed on. After analysing all of her data, du Châtelet concluded that energy cannot be created or destroyed.

# data[].attributes.attachment_link.readable_text
Energy is usually measured in joules (J). One joule of energy is transferred to a one watt device used for one second.

\(Energy~transferred = power \times time\)

\(1~J = 1~W \times 1~s\)

However energy companies use a different unit called kilowatt hours (kWh).

Appliances are usually used for long periods of time so very large amounts of energy are transferred.

1 kWh is the amount of energy transferred to a 1kW appliance in 1 hour.

\(Energy~transferred = power \times time\)

\(1~kWh = 1~kW \times 1~h\)

# data[].attributes.attachment_link.description
Energy is used in the home to power domestic appliances. Find out more with BBC Bitesize. For students between the ages of 11 and 14. Find out more with BBC Bitesize. For students between the ages of 11 and 14.

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The particles in solids are very close together, therefore they cannot usually be compressed or squashed. of attraction between the particles hold them together and keep them in place.

The particles in solids are arranged in a regular way. The particles in solids move only by vibrating about a fixed position. This gives solids a fixed shape and means that they cannot flow like liquids.

The hotter a solid gets, the faster its particles vibrate. This means that solids expand when they are heated.

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The particles in solids are very close together, therefore they cannot usually be compressed or squashed. of attraction between the particles hold them together and keep them in place. The particles in solids are arranged in a regular way. The particles in solids move only by vibrating about a fixed position.

# data[].attributes.attachment_link.readable_text
The particles in solids are very close together, therefore they cannot usually be compressed or squashed. of attraction between the particles hold them together and keep them in place.

The particles in solids are arranged in a regular way. The particles in solids move only by vibrating about a fixed position. This gives solids a fixed shape and means that they cannot flow like liquids.

The hotter a solid gets, the faster its particles vibrate. This means that solids expand when they are heated.

# data[].attributes.attachment_link.description
The particles in solids are very close together, therefore they cannot usually be compressed or squashed. of attraction between the particles hold them together and keep them in place. The particles in solids are arranged in a regular way. The particles in solids move only by vibrating about a fixed position.

# data[].attributes.attachment_link.readable_text
All life on Earth is made from cells. Without cells, there can be no life.

Almost all cells are so small that you need a to see them. Some organisms, like are made of only one cell. These are unicellular organisms . Others, like trees and blue whales, are made from millions or even billions of cells. These are multicellular organisms. These often have different types of cells, each with a different function. These are .

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Find out what animal and plant cells are and learn what the function of the cell wall and the nucleus is in this KS3 Bitesize biology article.

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All life on Earth is made from cells. Without cells, there can be no life.

Almost all cells are so small that you need a to see them. Some organisms, like are made of only one cell. These are unicellular organisms . Others, like trees and blue whales, are made from millions or even billions of cells. These are multicellular organisms. These often have different types of cells, each with a different function. These are .

# data[].attributes.attachment_link.description
All life on Earth is made from cells. Without cells, there can be no life. Almost all cells are so small that you need a to see them. Some organisms, like are made of only one cell. These are unicellular organisms . Others, like trees and blue whales, are made from millions or even billions of cells.

# data[].attributes.body
Use this knowledge organiser to produce a set of flash cards on the key words and definitions.
Produce a mind-map on the essential knowledge
Follow the links to carry out further reading in this subject area.

# data[].attributes.body
Use this knowledge organiser to produce a set of flash cards on the key words and definitions.
Produce a mind-map on the essential knowledge
Follow the links to carry out further reading in this subject area.

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Topic: Atoms, Elements, Compounds & Mixtures

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Topic: Atoms, Elements, Compounds & Mixtures

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A compound is a pure substance that is made from more than one element. In a compound, elements are chemically bonded together, which makes it very difficult to separate them.

When a compound is made, the atoms of the elements bond together in a fixed . This means that each compound can be represented by a chemical formula.

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Learn about elements, compounds and mixtures in this KS3 Chemistry guide from BBC Bitesize.

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Quiz: Atoms, Elements, Compounds & Mixtures

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Quiz: Atoms, Elements, Compounds & Mixtures

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Learn about elements, compounds and mixtures in this KS3 Chemistry guide from BBC Bitesize.

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The skeletal system - Skeleton - Living organisms - KS3 Biology - BBC Bitesize

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The skeleton allows movement, provides support, protection and makes blood cells Find out more with Bitesize. For students between the ages of 11 and 14.

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Some bones in the skeleton are joined rigidly together and cannot move against each other. Bones in the skull are joined in this way. Other bones are joined to each other by flexible joints. The vertebrae have limited movement, but the shoulders, elbows and knees are joints that allow more movement.

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Some bones in the skeleton are joined rigidly together and cannot move against each other. Bones in the skull are joined in this way. Other bones are joined to each other by flexible joints. The vertebrae have limited movement, but the shoulders, elbows and knees are joints that allow more movement.