Physics paper 6 help

[AhmedMans]

I need help with precautions in experiments, if someone could give me a few for each type, that would be great!

 

[hasini]

hey guys!!!!!!can some give the marking scheme of 2003 physics m/j paper 4 gce o level???

 

[a71]

In experiments involving the measurement of a length

• try to use lengths that are at least 100 mm in length
• you can measure to the nearest mm with a rule, or perhaps 0.5 mm
• when measuring heights ensure that the rule is held perpendicular to the base
• know how to arrange apparatus so that it is parallel or perpendicular to a bench
• know how to arrange a set square either side of a cylinder/sphere to measure diameter

When measuring an interval of time

• a stopwatch can measure to about 0.1 s, although it may give a reading to 0.01 s
• for oscillations (of a pendulum or vibrating rule), be able to define a complete oscillation
• time N oscillations, usually N>10 and use the terminology periodic time T = t/N
• explain how to use a fiducial aid at the centre of the oscillation
• explain where the eye should be placed to avoid parallax errors

 

[JimmyCarter]

Improvements that could be done to the experiment (temp. cooling):

• Same initial temperature.

• Same volume of water.

• Same shape of beaker.

• Beakers of same surface.

• Same room temperature.

• Stirring the water in the beakers.

• Same time intervals.

• Same surface area. (Unless given different containers)

• Adding water or cooling effect at regular intervals.

 

[JimmyCarter]

For images produced from lenses on screens, precautions taken
•Use of a darkened room for the experiment.
•Avoiding parallax error in measurement, and look perpendicular to the ruler.
•Object and lens at the same height from bench.
•Object/lens/screen is perpendicular to the bench.

To draw an image created from lens:
•Inverted from the original object.
•Sides are multiplied by the magnification.