Key term
CCEA A-Level Physics 1210
Physical Quantities, Scalars and Vectors
Moments and Equilibrium
Linear Motion and Dynamics
Newton's Laws of Motion
Linear Momentum and Impulse
Work, Energy and Power
Current, Charge and Potential Difference
Resistance and Resistivity
Topic overviewResistance and Ohm's lawOhmic and non-ohmic behaviourResistors in series and in parallelInvestigating current, voltage and resistance in series and parallel circuitsElectrical power and energy in resistive circuitsResistivity and the equation R = ρl/AMeasuring the resistivity of a metalCurrent–voltage characteristics of a conductor, a lamp and a diodeResistance, temperature and superconductivity
Internal Resistance and Potential Dividers
Topic overviewInternal resistance and terminal potential differenceConsequences of internal resistance for external circuitsMeasuring electromotive force and internal resistanceThe potential divider and variable outputPotential dividers in lighting and heating control circuitsLoaded potential dividers and output voltage calculations
Waves
Refraction
Lenses
Superposition, Interference and Diffraction
Topic overviewSuperposition of wavesStanding waves, nodes and antinodesStanding waves on stretched stringsStanding waves in a pipe closed at one endMeasuring the speed of sound with a resonance tubeConditions for observable interferencePath difference and phase differenceYoung's double slitDiffraction at a single slitThe diffraction grating
Quantum Physics
Wave-Particle Duality
Astronomy
Practical Skills and Data Analysis
Topic overviewChoosing and using measuring instrumentsPrecision, accuracy and recording measurementsUsing the cathode ray oscilloscope to measure voltage and frequencyTables, graphs and presenting resultsLinearising a relationship and using the gradientAbsolute and percentage uncertaintyCombining uncertainties and uncertainty on a graphRandom and systematic error, reliability and refining an experiment
Deformation of Solids
Thermal Physics
Topic overviewBoyle's law, Charles's law and the pressure lawThe ideal gas equation pV = nRTThe Avogadro constant, the mole and pV = NkTInternal energy and the distribution of molecular energyThe kinetic theory equation pV = ⅓Nm⟨c²⟩Average molecular kinetic energy and temperatureAbsolute zero and the kelvin scaleSpecific heat capacity and the electrical method
Uniform Circular Motion
Simple Harmonic Motion
Topic overviewDefining simple harmonic motion and a = −ω²xDisplacement, velocity and acceleration: x = A cos ωtThe simple pendulum and T = 2π√(l/g)The loaded spiral spring and T = 2π√(m/k)SHM graphs and finding velocity from a gradientFree vibrations, forced vibrations and resonanceDamping: light, critical and over-damping
The Nucleus and Radioactive Decay
Topic overviewAlpha-particle scattering and the nuclear atomNuclear radius and nucleon numberThe density of nuclear matterAlpha, beta and gamma radiation: nature, penetration and rangeNuclear equations and changes in nucleon and proton numberThe random and exponential nature of radioactive decayActivity, the decay constant and A = −λNExponential decay calculations with A = A₀e^(−λt)Half-life and measuring it
Nuclear Energy, Fission and Fusion
Gravitational Fields
Electric Fields
Capacitors
Magnetic Fields
Charged Particles and Accelerators
Linear Motion and Dynamics
Projectile motion
- 3 things to know
- Unit AS 1
Overview
Projectile motion as the combination of two separate motions, why the horizontal velocity of a projectile stays constant and acceleration of a projectile at every point of its flight.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Describe the velocity of a projectile at the highest point of its path.
Key term
Describe how air resistance changes the real path of a projectile compared with the ideal parabola.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is meant by a projectile?
Model answer
A projectile is an object that is given an initial velocity and then moves freely under the action of gravity alone, with air resistance neglected.
- 2
Describe the path followed by a projectile launched at an angle to the horizontal.
Model answer
The path is a parabola, and when the launch and landing points are at the same height it is symmetrical about the highest point.
- 3
Explain projectile motion as the combination of two separate motions.
Model answer
A projectile has a uniform velocity in the horizontal direction, because no horizontal force acts once air resistance is neglected, together with a uniform downward acceleration of 9.81 m s⁻² in the perpendicular vertical direction.
- 4
Explain why the horizontal velocity of a projectile stays constant.
Model answer
With air resistance neglected, gravity is the only force and it acts vertically, so there is no horizontal force; by Newton's first law the horizontal velocity therefore does not change.
- 5
State the acceleration of a projectile at every point of its flight.
Model answer
The acceleration is 9.81 m s⁻² directed vertically downwards at every point of the flight, including at the highest point.
- 6
Explain why the horizontal and vertical motions of a projectile can be treated independently.
Model answer
The two directions are perpendicular, so the vertical force of gravity has no component along the horizontal direction and cannot alter the horizontal motion; time is the only quantity the two motions share.
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