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Flashcards

Physics

Sam Ridge Physics Year 7 Inglês 66 flashcards

What is the density triangle?

Flashcards do conjunto (66)

  1. 1Solids where heat travels quickly through them are called?Thermal conductors
  2. 2What happens when the particles in a fluid gain thermal energy?They vibrate more as a result they become less dense.
  3. 3How do convection currents work?The particles of water by the heat source are getting more thermal energy than the surrounding water. This means they will vibrate more. As a result of this they move apart becoming less dense. As they are less dense the hotter particles will rise through the colder water. As this hot water calls down the particles vibrate less. This means they come closer together becoming less dense. So they will sink
  4. 4Why are solar cells black?Black is good at absorbing heat.
  5. 5What is the difference between evaporation and boiling?Evaporation is a surface effect whereas boiling occurs throughout the liquid.
  6. 6How do you make something a good thermal insulator?Air needs to be trapped.
  7. 7Where has all energy originated?All energy has come from the sun originally (in the first place)
  8. 8What are the renewable energy resources?Solar, Tidal, Hydro electric, Wave, Geothermal, Biomass, Wind
  9. 9What are the non renewable energy resources?Coal, Oil, Gas, Nuclear
  10. 10What are renewable energy resources?An energy resource that can easily be replaced, usually within a human lifetime.
  11. 11What is the Law of Conservation of Energy?Energy cannot be created or destroyed. It can only be transferred (converted) from one form to another.
  12. 12What is Energy?The ability to do work?
  13. 13What are the types of energy?ELECTRICAL ENERGY (energy in moving electrons), THERMAL ENERGY (energy in vibrating particles when objects are heated), CHEMICAL ENERGY (energy in chemicals) KINETIC ENERGY (Found in moving objects), GRAVITATIONAL POTENTIAL ENERGY (found in objects with the potential to fall), ELASTIC POTENTIAL ENERGY (found in stretched substances), LIGHT ENERGY (found in the electro magnet spectrum), SOUND ENERGY (found in compressions and rarefactions of sound waves), NUCLEAR ENERGY (energy trapped inside the nucleus of atoms).
  14. 14What is the density triangle?What is the density triangle?
  15. 15How do you measure the volume of an irregular solid?Measure enough water to cover the whole object, and pour it into a graduated cylinder, making sure you don't completely fill the cylinder. Read the volume of the water before displacement, and record the value. Immerse the solid into the cylinder so that the water completely covers the solid without any spillage. Let the water settle to avoid inaccurate reading. Read the new volume after displacement, and record the value. If necessary, repeat the process to ensure your values are accurate. To find the volume of the solid, subtract the water volume before immersion from the new water volume after the immersion. For example, if the initial water volume in the cylinder is 10 cubic meters and the volume after immersion is 15 cubic meters, the volume of the irregular solid is 5 cubic meters.
  16. 16When doing calculations one must?Show full working with units at every stage of a calculation.
  17. 17What type of wave is sound?Longitudinal wave
  18. 18What are the waves made up of?Compressions (particles bunched up close together)
    Rarefactions ( particles spread out)
  19. 19What does sound need to travel?Sound needs particles to move.
  20. 20If the tuning fork is big what will that do to the pitch?The bigger the tuning fork the lower the pitch.
  21. 21What do the trough and the crests represents ?The trough represents the rarefactions and the crests represent compressions.
  22. 22What happens if you increase the amplitude?The sound gets lower
  23. 23What happens if you increase the frequency?The frequency gets higher.
  24. 24Which three ways could you raise the pitch of a violin?Use a lighter weight string
    Make the string shorter
    Put more tension 'pull' on the string
  25. 25Approximately how much faster is the speed of light to the speed of sound?One million times faster.
  26. 26How does light travel?Light travels in waves.
  27. 27What does a transverse wave look like?What does a transverse wave look like?
  28. 28What do you call an object that gives off it's own light?Luminous
  29. 29What do you call an object that is lit up by light from luminous objects (they do not give off light themselves)?Illuminated
  30. 30What does opaque mean?Light doesn't travel through it.
  31. 31What does the transparent mean?To be able to see clearly through.
  32. 32What does translucent mean?An object that allows some light to travel through it.
  33. 33Why will a car's headlights not light the road around a corner?Light travels in straight lines.
  34. 34How is a shadow formed?How is a shadow formed?
  35. 35Do the incident ray and the reflected ray have to be the same?Yes
  36. 36What does a reflection of light diagram look like?What does a reflection of light diagram look like?
  37. 37What is the normal line?An imaginary line drawn at 90 degrees to the mirror where the incident ray strikes.
  38. 38What is the incident ray?The ray coming towards the mirror.
  39. 39What is the angle of incidence?The angle made by the incident ray and the normal.
  40. 40What is the reflected ray?The ray moving away from the mirror,
  41. 41What is the angle of reflection?The angle made by the reflected ray and the normal.
  42. 42What is refraction?When light goes from one substance from another and it changes direction.
  43. 43What does a refraction diagram look like?What does a refraction diagram look like?
  44. 44How do you know which direction the light will turn?When the light enters the more denser material it will bend towards the normal.
  45. 45How and why does total internal reflection happen?The angle of refraction is gradually increased. Eventually the light will have nowhere to refract to and total internal reflection will take place. This happens when the light reaches the critical angle.
  46. 46Total internal refraction diagram, ( Glass semicircle ).Total internal refraction diagram, ( Glass semicircle ).
  47. 47Which seven colours , is white made up of?red Richard
    orange Of
    yellow York
    green Gave
    blue Battle
    indigo In
    violet vain
  48. 48A diagram of how a prism splits up white light.A diagram of how a prism splits up white light.
  49. 49Why is a banana yellow?Because the pigments in the skin will only reflect yellow light
  50. 50why is coal black?Because it absorbs all the colours
  51. 51Why is a piece of paper white?Because it reflects every colour.
  52. 52What is weight?The force of gravity pulling on a mass, it is measured in newtons (N).
  53. 53What is mass?The amount of matter inside an object, it is measured in kilograms (kg)
  54. 54If the mass is bigger, the gravitational pull will be..?Bigger.
  55. 55What is the formula to find weight, mass or gravity?Weight =mass x gravity
  56. 56What is the mnemonic for remembering the planets?Rocky planets-
    Mercury-My
    Venus-Very
    Earth-Elegant
    Mars-Mother
    Gas giant planets-
    Jupiter-Just
    Saturn-Served
    Uranus-Us
    Neptune-Nine
    Pluto-Prunes
  57. 57How do we see the other planets and the moon?The light from the sun is reflected off these bodies an back to us.
  58. 58How long does it take for light from the sun to travel to earth?8 minutes.
  59. 59How is a day defined?A day is defined as the time a planet spins on its own axis.
  60. 60How is a year defined?A year is defined as the time a planet orbits its star.
  61. 61How is the moment calculated?By multiplying the force by the distance from the pivot.
  62. 62What is the triangle for working out moment/force/distance?m
    f d
  63. 63How is the moment of a force given?moment = force x perpendicular distance from pivot
  64. 64What is the normal unit used for moments?Newton- metres (Nm)
  65. 65What is another name for a pivot?A fulcrum
  66. 66—

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Year 7 Physics FlashCards sobre Physics, criado por Sam Ridge em 26-01-2019.
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Sam Ridge
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