iGCSE Physics (Combined) Edexcel
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55 topics in 7 modules
âď¸ Forces and Motion 10 topics
- Units
- Movement and Position
- Distance-Time Graphs
- Velocity-Time Graphs
- Forces Between Bodies
- Scalars and Vectors
- Friction
- Weight, Mass and Gravitational Field Strength
- Stopping Distance
- Hooke's Law
âď¸ Electricity 8 topics
- Units
- Mains Electricity
- Power, Current and Voltage
- Transfer of Energy
- A.C. and D.C.
- Energy and Voltage in Circuits
- Series and Parallel Circuits
- Voltage and Charge
âď¸ Waves 10 topics
- Waves: Units
- Properties of Waves
- Longitudinal and Transverse Waves
- Frequency
- Sound and Electromagnetic Waves
- The Electromagnetic Spectrum
- Uses of Electromagnetic Radiations
- Light and Sound
- Reflection
- Refraction
âď¸ Energy Resources and Energy Transfers 10 topics
- Units
- Energy Transfers
- Energy Transfer: Efficiency
- Work Done
- Gravitational Potential Energy
- Power
- Solids, Liquids and Gases: Units
- Density and Pressure
- Ideal Gas Molecules
- Absolute Zero
âď¸ Magnetism and Electromagnetism 6 topics
- Units
- Magnetism
- Electromagnetism
- Fleming's Left Hand Rule
- Electromagnetism: Loudspeakers
- Electromagnetic Induction
âď¸ Radioactivity and Particles 8 topics
- Units
- Radioactivity: Structure of Atom
- Nuclear Equations
- Half-life
- Uses of Radioactivity
- Dangers of Ionising Radiation
- Nuclear Fission
- Nuclear Fusion
âď¸ Astrophysics 3 topics
- Units
- Motion in the Universe
- Stellar Evolution
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iGCSE Physics (Combined) Edexcel Revision Content
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iGCSE Physics (Combined) Edexcel - Forces and Motion - Units Content Preview
Forces and Motion
Units
Understanding Units
- Units are standard quantities used to specify the measure of a particular physical quantity.
- The basic units we use are determined by the International System of Units (SI).
- Every physical quantity, from displacement to force, is measured in terms of these base units.
Units Used in Forces and Motion
- Displacement is measured in metres (m).
- Time is measured in seconds (s).
- Speed and Velocity are measured in metres per second (m/s).
- Acceleration is measured in metres per second squared (m/s²).
- Mass is measured in kilograms (kg).
- Force is measured in newtons (N).
Unit Conversions
- Always remember to convert units where necessary. For example, if time is given in minutes, convert to seconds for calculations involving speed or acceleration.
- Likewise, convert kilometres to metres when necessary.
Compound Units
- Some units are compound units â they are derived from more than one base unit. For example, the Newton is a compound unit derived from the equation F=ma (Force equals mass times acceleration). Therefore 1 Newton equals 1 kg m/s².
- Another common compound unit in Forces and Motion is metres per second squared (m/s²), used for acceleration.
The Importance of Units
- Always include units in your answer unless the question specifies otherwise, as marks often are awarded for correct use of units.
- When carrying out calculations, ensure the units you're using are consistent throughout in order to avoid errors.
Unit Prefixes
- Some units may have prefixes such as kilo (k), mega (M), giga (G), micro (Îź), nano (n) and so on. These alter the base unit by a particular factor.
- For instance, 1 kilogram (kg) equals 1000 grams and 1 millimetre (mm) equals 0.001 metres.
Question: A car increases its velocity from 5.0 m/s to 17.0 m/s in 4.0 seconds; state the unit of its acceleration in SI base units.
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