physics1

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Author:
colm
ID:
125886
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physics1
Updated:
2012-01-05 07:37:27
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physics
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Description:
physics mass,volume, density, speed, velocity and acceleration
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  1. What is the basic unit (and symbol) used for measuring length?
    Meters (m). The basic unit of length is the “meter” symbol: m
  2. In addition to the metre (m) - give three other commonly used units for length?
    kilometres (km), centimetres (cm) and millimetres (mm)

    • To measure lengths larger than a metre we often use kilometres (km). 1km = 1000 m.
    • To measure lengths smaller than a metre we often use centimetres (cm) 100cm = 1m or millimetres (mm) 1mm = 1cm.
  3. Name, state accuracy and give examples of use for 6 instruments for measuring length?
    • 1. Metre stick or ruler - accuracy: nearest mm. Used to measure a block of wood.
    • 2. Measuring Tape - accuracy: nearest mm. Rigid measuring tape used by builders to measure a wall. Flexible measuring tape used by tailor to measure a person’s waist.
    • 3. Callipers - accuracy: nearest mm. Measuring internal or external diameters of a object.
    • 4. Vernier Callipers - accuracy: nearest 0.1 mm. Measuring thickness of wire.
    • 5. Opisometer - accuracy: nearest mm. Used to measure distance on a map.
    • 6. Trundle Wheel - accuracy: nearest cm. Used to measure lines on a running track.
  4. What is a Trundle Wheel used for?
    A Trundle Wheel is used to measure lines on a running track or a football pitch. It is accurate to the nearest cm.
  5. Give the definition for mass
    The mass of an object is the amount of matter or stuff in it
  6. Name the instrument used to measure mass of a solid
    A scales, balance or electronic balance is used to measure mass of a solid.
  7. What is the basic unit (and symbol) used for measuring mass?
    Mass is measured in Kilograms (kg). A gram (g) is 1000th of a kg.
  8. In addition to the kilogram (kg) - give two other commonly used units for mass?
    Gram (g) or milligram (mg).

    A gram is 1/1000 of a Kg. A milligram is 1/1000 of a gram.
  9. Describe in 5 steps with a diagram the method to measure mass of a liquid
    • 1. Set up the scales and zero it
    • 2. Find the mass of a dry empty beaker and record it
    • 3. Add the liquid
    • 4. Read the new mass of beaker + liquid.
    • 5. Subtract the reading to get mass of liquid only
  10. What is the basic unit (and symbol) used for measuring time?
    Time is measured in seconds (s)
  11. In addition to seconds (s) - give four other commonly used units for time?
    Time is often measured in hours (h), minutes (m) days or years.
  12. Name and give examples of use for 4 instruments used for measuring time?
    • 1. Watch - To know the time
    • 2. Clock - to know the time
    • 3. Stopwatch - to time interval between two events.
    • 4. Electronic timers - professional sports such as Olympic Games
  13. Give the definition for temperature
    The temperature of a object is a measure of hot hot or cold the object is
  14. What is the basic unit (and symbol) used for measuring temperature?
    Temperature is measured in degrees Celsius oC
  15. What is the normal temperature of the human body?
    The normal temperature of the human body is 37oC
  16. At what temperature does water become ice?
    Water (a liquid) freezes and becomes ice (a solid) at 0oC
  17. At what temperature does water boil and become steam?
    Water (a liquid) boils a becomes steam at 100oC
  18. Name and give examples of use for 4 types of thermometers?
    • 1. Mercury Thermometer. Used in school laboratories.
    • 2. The thermoscan ear thermometer. Used in hospitals.
    • 3. Electronic digital Thermometer. Often used at home.
    • 4. Temperature sensor - used with data logging or PC.
  19. What name is given to the set of standard units that do most of the world use?
    Most of the world use the S.I. (Systéme Internationale) system of units.
  20. What does the prefix milli- mean?
    The prefix milli- (symbol: m) indicates one thousandent 1/1000 or 0.001 or 10 to the power of minus 3.

    10-3
  21. What is 5m plus 4 cm?
    ou can’t add meters and cm unless you convert to the same unit. So 500cm plus 4cm is 504cm
  22. What does the prefix hecto- mean?
    The prefix hecto- (symbol: h) indicates hundred 100 or 10 to the power of 2

    102
  23. What kilo does the prefix kilo- mean?
    The prefix kilo- (symbol: k) indicates thousand 1000 or 10 to the power of 3

    103
  24. Kilo indicates a 10n - What value has n?
    • N is 3. 10^3 or 103.
    • The prefix kilo- (symbol: k) indicates thousand 1000 or 10 to the power of 3.

    103
  25. Write 104 as a real number?
    10^4 is 4 zeros 1 0000 10,000 (Ten Thousand)
  26. What instrument is used to measure - A river on a map?
    • Opisometer
    • Accuracy: nearest mm.

    Used to measure distance on a map.
  27. What instrument is used to measure - The thickness of a tea-cup?
    • Callipers -
    • Accuracy: nearest mm.
    • Measuring internal or external diameters of a object.
  28. What instrument is used to measure - the length of the 3rd lane of a running track?
    • A Trundle Wheel
    • Accuracy: nearest cm.
    • Used to measure lines on a running track.
  29. What instrument would you used to measure - the quantity of liquid in a special juggling ball?
    A measuring cylinder is used to measure a quantity of a liquid.
  30. What instrument is used to measure - the time between a lightening flash and the sound of thunder?
    A stopwatch is how we measure the time between two events.
  31. Fill in the blanks.
    A [blank] is a instrument used to measure thickness. It has 2 scales called [blank] and [blank] .
    A Vernier Cllipers is a instrument used to measure thickness. It has 2 scales called main scale and vernier scale .
  32. Name a person’s senses
    A person has five senses - Sight, Touch, Hearing, Smell and Taste
  33. Give two example how a person senses can provide false information
    1) The “error of parallax” error when reading a ruler.

    2)Comparing the heights of objects placed at different distances.
  34. Give the definition for AREA ?
    The area of a shape is the amount of surface enclosed within its boundary lines
  35. Give the formula for the Area of a RECTANGLE ? Calculate the area of a rectangle with length =12.5m width = 4m?
    Area = Length X Width
  36. area = 12.5m X 4m
    • = 50 square metres or 50 metres squared
    • = 50m2
  37. Give the formula for the Area of a SQUARE ?
    Calculate length = 7 m ?
    Area = Length X Length

    • = 7m X 7m
    • = 49 square meters
  38. Give the formula for the Area of a TRIANGLE ?
    Calculate base = 13m, height= 8m ?
    • Area = ½ Base X Perpendicular Height
    • = ½ 13 X 8
    • = 6.5 X 8
    • = 52 square meters
  39. Give the formula for the Area of a DISC ?
    Calculate radius 4m ?
    • Area = PI x Radius X Radius
    • = 3.14 X 4 X 4
    • = 50.24 m2
  40. Give the definition for VOLUME ?
    The volume of an object is the amount of space it takes up
  41. Give the definition for DENSITY ?
    The density of a substance is its mass per unit volume.

    density = mass / volume

    = g / cm3 = g cm-3
  42. How do you measure the volume of a regular shape?
    The volume of a Irregular shape is often measured by displacement. e.g. We measure the volume of water that the solid displaces. We record the volume of liquid in a measuring cylinder before and after we put the solid in the liquid.
  43. Describe the principle of FLOATATION in terms of density of materials ?
    A solid object float in a medium if its density is less than that of the medium

    But a metal ship floats in water... thats another story.
  44. Describe why a metal ship floats in water even though the density of metal is greater than the density of water.
    • A ship is not a solid metal block.
    • A solid metal block does NOT float.

    The mass of the ship and its contents is less than the mass of the water that the ship displaces.
  45. Give the definition for SPEED ?
    The speed of a object is the distance it travels per unit time.

    • Speed = distance traveled / time taken
    • Measured in: meters / seconds m/s m s-1
    • and often in km/hour (km/h) km h-1
  46. Give the definition for VELOCITY ?
    TBD - Answer coming soon
  47. What is the difference between SPEED and VELOCITY?
    TBD - Answer coming soon
  48. Give an example of a plane’s speed and its velocity flying from London to New York?
    TBD - Answer coming soon
  49. Sketch a distance-time graph showing no movement for a period on 10 minutes.
    TBD - Answer coming soon
  50. Sketch a velocity-time graph showing a car traveling at a constant velocity for 10 min
    TBD - Answer coming soon
  51. Sketch a velocity-time graph showing a car going from 0km/h to 50Km/h over 30 sec
    TBD - Answer coming soon
  52. Sketch a velocity-time graph showing a car going from 60km/h to 0Km/h over 60 sec.
    TBD - Answer coming soon
  53. Sketch a velocity-time graph showing a car going from 0km/h to 50Km/h over 30 sec, then maintaining that speed for 30sec before going to 20 km/h over 20 sec and finally coming to a stop over 40sec.
    TBD - Answer coming soon
  54. Give the definition for ACCELERATION ?
    TBD - Answer coming soon
  55. On a straight road a car changed its speed from 6m/s to 12m/s in 20 seconds.

    Calculate acceleration.
    TBD - Answer coming soon
  56. On a straight track a train changed its speed from 14m/s to 4m/s in half a minute.
    Calculate acceleration.
    TBD - Answer coming soon
  57. Describe an experiment to compare the density of a potato, a block of wood and green-tea.
    TBD - Answer coming soon

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