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2014-05-04 07:51:53
science physics
Show Answers:

  1. What is energy measured in?
    J joules
  2. What is Resultant force measured in?
    N newtons
  3. What is Mass measured in?
  4. What is acceleration measured in?
  5. What is energy velocity in?
  6. What is time measured in?
  7. What is weight measured in?
    N newton
  8. What is gravitational field strength measured in?
  9. What is force measured in?
    N newton
  10. What is spring constant measured in?
  11. What is extension measured in?
  12. What is work done measured in?
    J joules
  13. What is  force applied measured in?
    N newton
  14. What is distance measured in?
  15. What is change in gravitational potential energy  measured in?
    J joules
  16. What is height measured in?
  17. What is kinetic energy measured in?
    J joules
  18. What is speed measured in?
  19. What is momentum measured in?
    kg m/s
  20. What is current measured in?
    A amps
  21. What is charge measured in?
    C coulombs
  22. What is potential difference measured in?
    V volts
  23. What is resistance measured in?
  24. What is power measured in?
    W watts
  25. What is the work done by an object moving 6m with a force of
    500 X 6 = 3000J =3KJ
  26. What is the force when something moved by 10m and 400J?

  27. How far has something moved with 300J of energy and 10N?
  28. What is 1Watt the same as?
  29. What is the change in Gravitational positional energy of a
    object with mass of 30 kg changing height by 2m?
  30. What is change in height of an object with mass and 200J of energy?
  31. What is the mass of an object moving 15m with 450 J ofgravitational energy?
    450/(15x10) = 3kg
  32. Explain what happens to GPE and KE during each swing of a
    While the pendulum1 is still it has maximum KE, when it is at its maximum height the GPE is at maximum and KE is zero. These keep transferring but eventually it will slow down and stop, this is because when the transfer takes place not all the energy transfers to KE or GPE because it is lost via thermal energy etc.
  33. What is the kinetic energy when mass is 30kg and  and velocity is 3m/s?
  34. What is the velocity when there is 500J of kinetic energy
    and a mass of 1000kg?
  35. What is the mass of an object withvelocity 10m/s and kinetic energy of 50KJ?
  36. What is current?
    Rate of flow of charge
  37. What is momentum?
    Describes how hard it would be to stop  a moving object.
  38. What is the momentum of an object with a mass of 10kg and velocity 2m/s?
    2x10= 20kgm/s
  39. What is the mass of an object with momentum of 50kgm/s andvelocity 50m/s?
  40. What is the velocity of an object with mass 50kg and momentum of 100kgm/s?
  41. How does the power of a device affect the rate at which it
    transfers energy?
    The more powerful the quicker the rate at which it transfers energy.
  42. Which is more powerful A torch bulb or a mains filament lamp.
    A mains filament lamp
  43. Does a 1kw heater use the same amount of electric energy in1 hour as
    A 2kw heater on for 30 mins
    A 4kw heater on for 2 hours
    A 2kw heater on for 30 mins
  44. A 1000kg rail wagon moving at velocity of 50m/s on a track,
    collides with a 1500kg stationary wagon. The two wagons move together after the

    a) Calculate the velocity of the wagon before the collision

    b) Calculate the velocity of the two wagons afterwards.
    a) 1000x5=5000kgm/sb) After the collision the total momentum is 5000kgm/s5000/2500=2m/s
  45. What is the final momentum after an explosion?00=(m1v1)+(m2v2)
    • 0
    • 0=(m1v1)+(m2v2)
  46. A student of mass 40kg standing at rest on a skateboard of
    mass 2kg jumps of the skateboard at a speed of 0.3m/s. Calculate the recoil velocity
    of the skateboard.

     (-2V)= (40x0.3)


  47. What is the potential difference when the current is 3amps
    and the resistance of the wire is 4 ohms?
  48. What is the current when the resistance is 10 ohms and the
    potential difference is 43 volts?
  49. What is the resistance when the potential difference is 54
    volts and the current is 9 amps?
    54/9=6 ohms
  50. What is current in a series circuit like?
    The same all around.
  51. What is voltage in a series circuit like?
    The same all around.
  52. What is voltage in a series circuit like?
    Spread across or shared out between components
  53. What is voltage in a series circuit like?
    The same all around.
  54. What is current in a series circuit like?
    Spread across or shared out between components
  55. What is an ohmic device?
    • Something that follows ohms law V=IR or if you increase voltage
    • current increases
  56. What do excited electrons have?
    More energy.
  57. Name  four non-ohmic
    Filament bulb


    Light dependent resistor (LDR)

  58. What are diodes, LEDs AND LDRs made of?
    Semi conductors
  59. What happens as current increases in a filament bulb?
    • Thin wire heats up, as it becomes hotter its resistance
    • increase, so it needs a larger p.d. to make the current increase in a small
    • amount.
  60. Does it affect resistance of a filament if p.d. is positive
    or negative?
    No it is the same.
  61. Give
    an example of a diode

  62. What happens as light shines on a light dependant resistor
    becomes brighter?

    Resistance increases so current increases
  63. Name two things LDRs are used for?
    Smoke alarms

    Security lighting.
  64. How does a smoke alarm work?
    • Smoke
    • stops light getting to the LDR and the change in current switches oh the alarm
  65. How does a security light work?
    • As it gets darker the resistance increases , the
    • change in current turns on the light
  66. What does heating a thermistor do?

    • Makes the resistance decrease so the current though the
    • thermistor increases (Heat can make resistance increase or decrease)
  67. Name two things thermistors are used for?
    Electric thermometers

  68. How does an electric thermometer work?
  69. Temperature is measured by the resistance
  70. Is there flow in the negative direction in a diode?
    No only in the positive direction past a certain point e.g.0.6 volts(No increase until past this point)
  71. How do you calculate the total resistance over a circuit?
  72. Calculate the current when p.d. is 6v and resistance is 4ohms.
  73. Calculate resistance when p.d. is 6v and current is 0.5 A.
    6/0.5=12 ohms
  74. Calculate the p.d. when current is 10A and resistance is 2.5ohms.
    10x2.5=25 V
  75. How long
    will it take a car to travel 300m at 20m/s?
    • 300x20=6000s         
    • =100 mins
  76. How far can
    a car travel going 100m/s in 60 seconds?
    100x 60=600m
  77. What is the
    difference between Velocity and Speed?
    Speed is a scalar quantity which can get biggerVelocity has direction (speed in a given direction)
  78. What is the
    equation for working out speed, distance or time?
  79. Distance = Speed x Time

  80. How long will it take for a car to travel 150m at 3m/s?
    • 150/3=50 seconds
  81. How fast is
    a car travelling if it travels 100m in 20 seconds?
    100/20= 5m/s
  82. How would
    you convert mins to secs?
  83. What is the
    difference between average speed and instantaneous speed.
    • Average speed is the whole distance over the whole time or over a
    • particular time.Instantaneous is when the speed over a certain distance and the time it
    • took to travel there e.g. at a particular point
  84. What is thestopping distance at 20mph?
  85. What is the stopping distance at 80mph?
  86. What is the relationship between: Force and Mass
    Force and acceleration are Proportional
  87. How do youwork out the distance something has travelled on a velocity graph?
    Work out the area under the graph by splitting it up into shapes.
  88. Which axis is time always in?
  89. How do you work out stopping distance?
    Thinking distance + Braking distance
  90. What is the point of the centre of gravity must pass for an object to fall over?
    the base
  91. How fast is
    a car travelling when it travels 100m in 5 seconds?
  92. Acceleration of a car mass 1000kg force 20000N?
  93. Acceleration of a car mass 1000kg force 20000N?
  94. What affectsboth braking and thinking distance?
  95. What is the stopping distance at 60mph?
  96. What is weight?
    A force that acts downwards on an object dueto gravitational pull
  97. What is the
    relationship between the forces of a stationary object?
    They are balanced
  98. What is the
    equation for working out Mass, Weight and Gravitational field strength?
    • Weight = Mass x
    • Gravitational field strength.
  99. What is the
    stopping distance at 50mph?
  100. What isterminal velocity?
    When the forces on an object are equal
  101. What is the force needed to accelerate a bus
    4000kg by 2m/s2?
    4000x2= 8000N
  102. What are the
    two situations that can occur when forces are balanced?
  103. When an object is travelling at a constant speedWhen an object is at rest(stopped)
  104. What is the
    stopping distance at 30mph?
  105. Give three
    things that affect thinking distance.
    • If the driver is under the influence of drugs or alcohol etc. make it
    • slowerIf the driver has had caffeine which could make it fasterIf there is a distraction in the car making it slower
  106. What is the
    relationship between distance and velocity?
    • the greater the
    • velocity the greater the  distance

  107. How far can a car travel in 60 seconds at 10m/s?
    • 60x10=600m

  108. What is the stopping distance at 40mph?


  109. What is Braking distance?

    the distance it takes for the car to physically stop.

  110. Give three things that affect braking distance.
    • If the road is wet or icy
    • Mass of the car if it is heavier it will be harder to stop
    • The condition of the car e.g. worn brakes

    • Mass of a car force 15 KN at 10 m/S2?


    • What is thinking distance?

    the distance you travel before thinking you need to stop

    • How would you convert minutes to hours?


  111. What is 1N the same as?

    1 kgm/s2

  112. How does deceleration differ to acceleration?

    It is the same with a -

  113. What is up thrust?

    The Upward force

  114. How would you convert hours to minutes?


    • What is the stopping distance at 70mph?


  115. What is drag?

    The force acting in the opposite direction to the motion of a moving object

  116. How would you convert seconds to minutes?


  117. On a
    velocity graph what direction is object C moving in?
    It is not moving
  118. On a velocity graph what direction is object B moving in?
    • Back to the start
  119. On a velocity graph what direction is object A moving in?
    • Away from the start

  120. Which is moving faster?
    • A

  121. Label 1, 2 and 3 with what the force is?
      • 1. Push
      • 2. Weight
      • 3. Friction

  122. Describe the speed graph.
      • between a and b the object is accelerating
      • between b and c the object is moving at a constant speed.
      • between c and d the object is decelerating

  123. A stone weighing 20N drops with 4N of drag and 2N of up thrust:
    a)What is the total upward force
    b) the resultant force
    c) the direction it is travelling in

      • a) 4N+2N=6N
      • b) 20N-6N=14N
      • c) Downwards
  124. Describe the velocity graph
      • between a and b the object is moving away from the start
      • between b and c it is stationary
      • between c and d it is returning to the start

  125. What is A?


  126. What is B?

    Thermal resistor

  127. What is C?


  128. What is D?


  129. What is E?


  130. What is F?


  131. What is G?


  132.  What is H?


  133. What is I?


  134. What is A?
    Brass disc

  135. What is B?

    Ebonite stopper

  136. What is C?

    Brass rod

  137. What is D?

    Gold leaves

  138. What is E?

    Tin foil

  139. What is F?

    Wooden base

  140. Why do the gold leaves rise ?

    because the rod is negatively charged and this wants to go back  to the ground so it repels this down the brass rod into the leaves, which the repel each other causing them to rise/move apart.

  141.  What is a  resistance graph for a filament bulb like?
  142. What does a resistance graph for a diode look like?

  143. What is this?


  144. What is this?


  145. What is this?
    • Thermistor