As Physics(3)

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3. Kinematics Definitions: Distance: total length moved along the path, irrespective of direction. (scalar) Displacement: distance moved in a certain direction. (vector) Speed: distance traveled per unit time, no direction. (scalar) Velocity: the rate of change of displacement. (vector) Acceleration: th...

AS physics(1)

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1.Physical quantities and units Physical quantity A Physical quantity has magnitude and unit Base Units The following are base units: Quantity Basic Unit Mass (m) ( m ) Kilogram (kg) ( k g ) Length (l) ( l ) Meter (m) ( m ) Time (t) ( t ) Second (s) ( s ) Temperature (T) ( T ) Kelvin (K) ( K ) Electric ...

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10. Current of Electricity Definition and equations: Electric current: flow of charged particles. Charge at a point. product of the current at that point and the time for which the current flows, Q = I t Coulomb: charge flowing per second pass a point at which the current is one ampere Charge is quantiz...

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11. D.C. Circuits Electromotive Force (emf): the energy converted into electrical energy when 1C of charge passes through the power source. Potential Difference and Electromotive Force Potential difference (work done per unit charge) —— energy transformed from electrical to other forms per u...

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12. Nuclear Physics Geiger-Marsden \mathbf{\alpha} α -scattering Experiment: a beam of \alpha α -particles is fired at thin gold foil Results of the experiment: Most particles pass straight through Some are scattered appreciably Very few – 1 in 8,000 – suffered deflections > 9...

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9. Superposition Principle of Superposition When two or more waves of the same type meet at a point, the resultant displacement is the algebraic sum of the individual displacements Interference and Coherence Interference: the formation of points of cancellation and reinforcement where 2 coherent waves p...

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8. Waves Definition Displacement: distance of a point from its undisturbed position Amplitude: maximum displacement of particle from undisturbed position Period: time taken for one complete oscillation Frequency: number of oscillations per unit time Wavelength: distance from any point on the wave to the...

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7. Deformation of Solids Compressive and Tensile Forces Deformation is caused by a force. Tensile force Act away from each other, object stretched out Compressive force Act towards each other, object squashed Hooke’s Law A spring produces an extension when a load is attached. According to Hooke&#3...

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6. Work, Energy, Power Law of conservation of energy T he total energy of an isolated system cannot change—it is conserved over time. Energy can be neither created nor destroyed, but can change form e.g. from g.p.e to k.e. Work Done Work done by a force: the product of the force and displacement i...

As Physics(5)

浏览:46 2022-08-13 19:29:38

5. Forces, Density, Pressure Definition Force: rate of change of momentum Density: mass per unit of volume of a substance Pressure: force per unit area Finding resultant (nose to tail) By accurate scale drawing Using trigonometry Field Gravitational fields: a region of space in which a mass experiences ...