Year 9 End of Year Exam Revision Plan: Comprehensive Study Guide

Energy Stores

• Kinetic

• Thermal

• Chemical

• Gravitational

• Elastic

Conservation of Energy

• Energy cannot be created or destroyed.

• Power = energy ÷ time

Energy Transfer

• Conduction: occurs in solids.

• Convection: occurs in liquids and gases.

• Radiation: no particles needed for transfer.

Motion & Pressure

• Speed = distance ÷ time.

• Pressure = force ÷ area.

• In liquids, pressure increases with depth.

Inheritance

• Variation:

  • Continuous (e.g., height)

  • Discontinuous (e.g., blood group)

• DNA carries genes.

• Natural selection relates to survival of the fittest.

Atoms

• Atom = proton + neutron + electron.

• Atomic number equals number of protons.

• Isotopes: same number of protons but different number of neutrons.

• Mixtures can be separated physically.