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P1 physics
Fichas del conjunto (52)
- 1Difference between heat and Temperature?Heat is a a form of energy and is measured in jules.
Temperature tells us hot something is and measured in degrees celcius . - 2What happens to an objects temperature if it is warmer than its surroundings.The energy will flow from the object to its surrounding.
- 3What happens if an object is cooler than its surroundings?Then it gains energy from its surroundings.
- 4Temperature is a measure of...?The average kinetic energy of the particles in a substance.
- 5Heat is a measure of...?Energy on an absolute scale. Unlike temperature, it is not related to reference points.
- 6What happens to an object as it gains energy?Gets hotter.
- 7What happens to an object as it loses energy?It gets cooler.
- 8Different materials, hold different amounts of...?Energy.
- 9It takes more energy to raise 1KG of... than 1KG of...?Water. Aluminium.
- 10This means water has a higher...?Specific heat capacity.
- 11Specific heat capacity of a material is defined as...?The amount of energy in joules needed to raises the temperature of 1kg of a material by 1 degree celsius.
- 12What are the units for specific heat capacity.J/KG degrees celcius.
- 13You can calculate the amount of energy required to heat an object by which equation.energy (J) = mass (KG) x specific heat capacity (J/KG degrees Celsius) x temperature changer (degrees celsius)
- 14Why is water used in central heating systems?It transfers thermal energy well. It also has a high specific heat capacity so transfers a lot of energy because it needs a lot of energy to heat it up.
- 15How do you work out the specific heat capacity.mass (KG) x energy J x temp change (degrees C)
- 16What is a change of state? Name two of them.When something melts is takes in energy just to change it from solid to liquid. While ice melts its temp stays the same it just takes in energy.
Two examples.
1 ICE to water
2 water to gas. - 17What is specific latent heat.The amount of energy (in joules) needed to change the state 1KG of a substance.
- 18What is the equation of specific latent heat?energy (j) = specific latent heat (j/kg) x mass (kg)
- 191KJ = how many joules1000J
- 20what is fusionmelting a substances
- 21vaporisationboiling and evaporating a substance
- 22Energy is sent through a solid by...Conduction
- 23What happens when you heat up one end of a material.The particles start vibrating more. The kinetic energy is passed to its neighbour. The energy is transferred to each other by colliding with each other.
- 24What material is a good thermal conductor.Metal.
- 25Why are radiators made of metalThere particles are close together so the energy can pass through easily.
- 26Name two thermal insulatorsWood, plastics
- 27Why does the energy not pass through the particles easily.They are in an irregular pattern. The energy passes slowly from particle to particle.
- 28Why are liquids and gases poor thermal conductors.The particles in a liquid are not in any regular arrangement. So it is difficult for the energy to be passed on. Gas the particles are very far apart so it is almost impossible for the energy to be transferred.
- 29Free electronsThey travel freely through metals conducting electricity. They gain more kinetic energy from collisions.
- 30What is convectionWhen particles carry energy from one place to another.
- 31What is convection currentThe cooler fluid is denser that the warmer fluid so the warmer fluid rises and the cooler fluid flows downwards.
- 32What absorbs lightBlack
- 33What reflect lightSilver
- 34Infrared is what type of waveElectromagnetic
- 35when you insulate you house you reduce energy loses through...Convection, conduction, radiation
- 36Air is a good ... insulator and a poor ... conductorthermal, thermal
- 37Equation for payback timeCost/savings per year= ...years
- 38What is a sankey diagram.A sankey diagram is a diagram which tells us how much energy goes in, how much is useful and how much is wasted.
- 39Equation for efficiency.Efficiency= useful energy output /
total energy input X100% - 40Waves contain a series of....Troughs and crests
- 41Waves are mad up of a series of...Oscillations (back and forth motion that happens over and over again)
- 42AmplitudeMaximum hight of the wave measured from the middle.
- 43WavelengthShortest distance between one point and the same point on the next wave.
- 44FrequencyThe number of waves passing one point in one second.
- 45Wave equationwave speed= Frequency X wavelength
- 463 examples of electromagnetic waves.Light, microwaves, X rays
- 47What don't electromagnetic waves need to travelA medium they can travel through a vacuum.
- 48What is the speed of light.300,000,000m/s
- 49All waves can be...Reflected
- 50What is the law of reflection.States that the angle of incidence is always equal to the angle of reflection.
- 51What is refraction.When a wave goes from one medium to another it changes direction. The wave slows down and bends towards the normal.
- 52What is diffraction.Diffraction is where the waves pass through a gap or move around an object. The size of gap relative to the wavelength of the wave affects how much diffraction takes place.
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- Fichas sobre P1 physics, creado por 11-buller el 29/12/2014.
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- 11-buller
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