Physics

Descripción

Physics Topics - motion forces and conservation of energy - Waves and the Electromagnetic Spectrum - Radioactivity and Astronomy - Forces and Energy - Electricity and Circuits
Dayo Odunowo
Fichas por Dayo Odunowo, actualizado hace más de 1 año
Dayo Odunowo
Creado por Dayo Odunowo hace más de 6 años
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Resumen del Recurso

Pregunta Respuesta
What are vector quantities? A physical quantity that has a size and a direction.
What is a Scalar quatity? A physical quantity that only hs a size but not a diretion.
Is distance Scalar or Vector? Scalar
Is velocity Scalar or Vector? Vector
What is the equation that involves speed, distance and time? speed= distance/ time
Typical speeds of transport method: 1)Walking- 2)Running- 3)Cycling- 4)Cars- 5)Aeroplane- 1)Walking- 1.4km/h 2)Running- 11km/h 3)Cycling-20km/h 4)Cars- 13m/s 5)Aeroplane- 250m/s
Formula for finding acceleration
Example: A car is travelling at 15m/s when it collides with a tree and comes to a stop. Estimate the deceleration of the car. a=(v-u)÷t =(0-15)÷1 =-15m/s²
The equation for uniform acceleration v² - u² = 2 x a x X X= Distance
What is the equation for calculating gradient in a Distance/Time graph? Change in the vertical ÷ Change in the horizotal
What is Newton's First Law? A resultant force is needed to make something start moving, speed up or slow down.
What is the equation involvoing resultant force, mass and acceleration? F = m x a F= Resultant Force (N) m= Mass (kg) a= Acceleration (m/s²)
What is the definition of mass? Mass is a measure of how much stuff is in an object.
Is mass a scalar or vector quantity and what are its units? Mass is a scalar quantity and is measured in kilograms.
What is the equation that involves weight mass and gravitational field strength?
What is momentum? Momentum is the product of an objects mass and velocity.
What is the equation for momentum?
Example: A 50 kg cheetah is running at 60m/s. Calculate its momentum. p = m x v = 50 x 60 =3000 km m/s
Whats thinking distance? The thinking distance is the distance travelled in between the driver realising he needs to brake and actually braking.
what is braking distance ? The braking distance is the distance taken to stop once the brakes are applied.
Ruler drop test Person A holds out their hand with a gap between their thumb and first finger. Person B holds the ruler with the zero at the top of person A's thumb Person B drops the ruler without telling Person A and they must catch it. The number level with the top of person A's thumb is recorded in a suitable table.
Factors that might increase thinking distance Thinking distance can be increased by: greater speed tiredness alcohol and drugs distractions
Factors that might increase thinking distance Braking distance can be increased by: greater speed poor road conditions (icy, wet) car conditions (bald tyres, poor brakes, full of people)
What are the 8 energy stores? Kinetic Thermal Chemical Gravitational potential Elastic potential Electrostatic Magnetic Nuclear
When an object is moving what kind of energy is it using? Kinetic energy
What is the equation for kinetic energy?
What is the useful and wasted energy in a kettle? USEFUL: heat WASTED: Light Sound
What is the equation for efficiency?
What diagram is used to show efficiency? Sankey diagrams
If the particles of the medium are vibrating to and fro in the same direction of energy transport, then the wave is a ____ wave. longitudinal
When the particles of a medium are vibrating at right angles to the direction of energy transport, then the wave is a ____ wave. transverse
What is the amplitude of the wave in the diagram below? 0.03 m
The number of cycles of a periodic wave occurring per unit time is defined as a wave's ___ _. frequency
What is the equation that relates wave speed, wavelength and frequency?
What is the minimum frequency of an ultrasound? 200000 Hz
What is one use of ultrasound? To produce a video image of the foetus
What is the maximum frequency lower than 20Hz? Infrasound
What can infrasounds detect? Seismic waves
What is the law of reflection? Angle of incidence = Angle of Reflection
What are the visible light colours? Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROY G BIV)
What type of lens is a concave lens? Convergent/ Divergent Divergent
What type of lens is a convex lens? Convergent/ Divergent Convergent
What is the order if the Electromagnetic spectrum starting from the longest wavelength? Radio, Microwaves, Infrared, Visible light, Ultra Violet, X-rays, Gamma rays
Which EM wave has the hightest frequency? Gamma Ray
Which EM wave has the most energy? Gamma Ray
What types of waves are the EM spectrum waves? Transverse waves
Everything you know about the current model of the atom. ( include charge and mass) Particle mass charge Proton 1 +1 Neutron 1 0 Electron 1/1836 –1
Alpha decay When an alpha particle is emitted from a nucleus the nucleus loses two protons and two neutrons. This means the atomic mass number decreases by 4 and the atomic number decreases by 2.
Beta Decay In Beta (β-) decay, a neutron changes into a proton plus an electron. The proton stays in the nucleus and the electron leaves the atom with high energy, and we call it a beta particle.
Properties of alpha, beta and gamma decay
isotope definition Isotopes are the atoms of an element with different numbers of neutrons. They have the same proton number, but different mass numbers.
Half-Life definition Isotopes are the atoms of an element with different numbers of neutrons. They have the same proton number, but different mass numbers.
What is background radiation? Background radiation is all around us. Some of it comes from natural sources and some comes from artificial sources.
Give an example of what Alpha Radiation can be used for Household fire alarms
Give an example of what Beta Radiation can be used for Thickness of Paper
Give an example of what Gamma Radiation can be used for Sterilising food and medical equipment
What is Nuclear Fission? Nuclear Fission is a type of nuclear reaction that is used to release energy from uranium atoms. Fission is another word for spliting. Uranium is mainky used because it has a large nuclei so can easily split when hit by a neutron.
What is Nuclear Fusion? Nuclear Fusion involves 2 atomic nuclei joining to make a large nucleus
What is the equation for Work Done?
What is the equation for Power?
What is moments? A moment is a turning effect of a force
What is the formula for moments?
What is current? The rate of flow of charge
What is the formula for charge?
Name all the circuit symbols without looking. :)
what is potential difference? The energy transferred per coulomb of charge
What is the equation for energy transffered?
What is the equation for potential difference?
Difference between parellel and series circuits. In a series circuit, the current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component. In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.
What is the equation for density?
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