Matter - models and explanations
How does energy transform matter? - Cambridge OCR 21st Century
When energy is added to matter, its temperature will rise. The temperature rise will depend on the mass, which in turn depends on its density.

The particle model and heating - Cambridge OCR 21st Century
The particle model describes the arrangement of particles in solids, liquids and gases. It can be used to predict changes when matter is heated.

Quiz: Temperature changes and energy
This interactive quiz is suitable for GCSE physics students studying states of matter, internal energy, energy and temperature, specific heat capacity and specific latent heat.

Interactive activity: States of matter - Cambridge OCR 21st Century
Visualise what happens when states of matter change with this interactive activity designed for the OCR 21st Century GCSE physics specification.

Materials under stress
Forces are responsible for changing the motion of objects. If more than one force is present, the shape of an object can also be changed.

Pressure in liquids and gases - Cambridge OCR 21st Century
Every living thing on Earth is in balance with the pressure of the air or water around it. Pressure helps blood to move around the body and allows organisms to breathe.

Quiz: Pressure in fluids
This interactive quiz is suitable for GCSE physics students studying calculating pressure, pressure in a liquid and atmospheric pressure.

Quiz: Particles in gases
This interactive quiz is suitable for GCSE physics students studying particle motion, gas pressure and temperature, gas pressure and volume and changing gas pressure - Higher.

Understanding the Big Bang Theory - Cambridge OCR 21st Century
The Sun is our nearest star. It is a relatively small star when compared to other stars in the Universe. The Big Bang theory suggests how our Universe was created. The evidence for this is red-shift.

Quiz: The Solar System
This interactive quiz is suitable for GCSE physics students studying the structure of the Solar System, the Sun, orbital motion and orbits and speed - Higher.

Sample exam questions - matter - Cambridge OCR 21st Century
Understanding how to approach exam questions helps boost exam performance. Questions will include multiple choice, descriptions and explanations, using mathematical skills and extended writing.

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