Key term
Edexcel GCSE Combined Science Physics 1SC0
Key Concepts of Physics
Motion and Forces
Topic overviewScalar and vector quantitiesExamples of vectors and scalars, and velocitySpeed, distance, time and distance-time graphsAcceleration and the equation v squared minus u squaredVelocity-time graphs and free fallMeasuring speed in the laboratory, and typical everyday speedsNewton's first law, and investigating force, mass and accelerationNewton's second and third lawsWeight, mass and gravitational field strengthReaction time, stopping distance and large decelerationsFactors affecting stopping distance and reaction time
Conservation of Energy
Waves
Light and the Electromagnetic Spectrum
Topic overviewProperties of electromagnetic wavesInvestigating refraction in glass blocksThe groups of the electromagnetic spectrumThe continuous spectrum, and what our eyes can detectHow radiation is generated, and why danger rises with frequencyHarmful effects of excessive exposure to radiationUses of electromagnetic radiation
Radioactivity
Topic overviewThe atom and the size of atomsIsotopes, atomic number and mass numberRelative masses and charges of subatomic particlesElectron orbits and energy levelsForming ions, and how the atomic model changedTypes of ionising radiationBackground radiation and detecting radioactivityAlpha, beta and gamma, and their penetrating powerBeta-minus and beta-plus decayEffects of decay on atomic number and mass numberBalancing nuclear equationsActivity and the becquerelHalf-life and the randomness of decayHalf-life calculationsThe dangers of ionising radiationSafety precautions, contamination and irradiation
Energy – Forces Doing Work
Topic overviewEnergy stores and energy transfer diagramsChanging a system's energy, and measuring work doneWork done and the energy changes it causesGravitational potential and kinetic energy calculationsDissipation and wasted energyPower as the rate of energy transferThe watt, and calculating efficiency
Forces and Their Effects
Electricity and Circuits
Topic overviewThe atom, and drawing circuit diagramsSeries and parallel circuitsPotential difference and the voltmeterEnergy transferred by moving chargeCurrent, charge and measuring currentResistance and the equation V = IRResistors in series and in parallelDesigning circuits to test componentsInvestigating resistance in circuitsCurrent-potential difference graphs for componentsLight-dependent resistors and thermistorsThe heating effect of an electric currentUses of the heating effect, and the equation E = IVtPower as energy transferred per secondCalculating electrical powerEnergy transfer in domestic devices, and power ratingsDirect and alternating currentAlternating current and the UK mains supplyLive and neutral wires, earthing and fusesFuses in the live wire, mains voltages and electrical dangers
Magnetism and the Motor Effect
Electromagnetic Induction
Particle Model
Topic overviewKinetic theory and differences in densityCalculating density, and investigating itChanges of state and internal energySpecific heat capacitySpecific latent heat and thermal insulationInvestigating the specific heat capacity of waterGas pressure and the motion of particlesAbsolute zero and the kelvin scale
Motion and Forces
Measuring speed in the laboratory, and typical everyday speeds
- 3 things to know
- Paper 5
Overview
Measuring speed with light gates or a metre rule and stopwatch, typical speeds for walking, running, cycling, cars, wind and sound, then accuracy, precision, repeatable and reproducible results, and random, systematic and zero errors.
What you need to know
Answer each one before you reveal it.
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Key term
Why does a light gate give a more accurate speed than timing a trolley with a stopwatch?
Key term
Describe how a metre rule and a stopwatch can be used to find the average speed of a person walking along a corridor.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe how a single light gate can be used to measure the speed of a trolley.
Model answer
A card on the trolley interrupts the beam, and the card length is divided by the time the beam is blocked.
- 2
Why does a light gate give a more accurate speed than timing a trolley with a stopwatch?
Model answer
The light gate removes human reaction time from the measurement, so the timing is more accurate.
- 3
Describe how a metre rule and a stopwatch can be used to find the average speed of a person walking along a corridor.
Model answer
The measured length of the corridor is divided by the stopwatch time taken to walk it.
- 4
What two measurements must be taken to calculate the speed of a moving object in the laboratory?
Model answer
A distance travelled and the time taken to travel it.
- 5
Explain why the card on a trolley must be measured carefully when a light gate is used to find speed.
Model answer
The card length is the distance used in the speed calculation, so an error in it gives an error in the speed.
- 6
Describe how two light gates a measured distance apart are used to find an average speed.
Model answer
The distance between the gates is divided by the time taken to travel from one gate to the other.
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