Required Practicals Flashcards

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1
Q

Determining g from freefall method

A
  • Measure h from the bottom of the ball bearing to the trap door
  • Flick switch and start timer
  • The ball bearing falls, knocking the trapdoor and breaking the circuit which stops the timer. Record T
  • Repeat and drop the ball from different heights
  • Plot graph (h against t^2)
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2
Q

Errors in freefall experiment

A
  • Most significant source of random error is the measurement of h (uncertainty of 1mm)
  • using a small and heavy ball allows you to ignore resistance
  • Having a computer automatically release and start the timer means a small uncertainty than if a human with a stop watch did it
  • Doing it by hand gets large uncertainty due to human reaction times.
  • Systematic error if there is a delay in the switch or timing mechanism
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3
Q

Youngs Modulus method

A
  • Test wire should be as thin and long as possible (reduces uncertainty)
  • Find cross sectional area using a micrometer to measure diameter in several places. Use formula for area of a circle (pir^2)
  • Clamp wire to bench so weights can be hung off one end, use weight to straighten wire but don’t measure it
  • Measure distance from fixed end to marker
  • increase weight to make the wire stretch
  • Increase in 100g intervals
  • Measure extension
  • calculate stress and strain
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4
Q

Problems with YM experiment

A
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5
Q

Resistivity of a wire (202)

A
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6
Q

e.m.f (209)

A
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7
Q

mass-spring (238)

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8
Q

Simple pendulum (241)

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9
Q

Gas laws (257-259)

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10
Q

Discharging through fixed resistor (315)

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11
Q

Inverse square (376)

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12
Q

Flux linkage (341)

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13
Q

Force on a wire (330)

A
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