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Beschreibung
Karteikarten von Dayo Odunowo, aktualisiert more than 1 year ago
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Erstellt von Dayo Odunowo
vor mehr als 6 Jahre
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| Frage | Antworten |
| 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
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| 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? |
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| 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 |
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What is the amplitude of the wave in the diagram below?
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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 |
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| 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? |
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| 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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