Precautionary

Notes Physics

Program Cemerlang Bersama SM Teknik 2009

PRECAUTIONARY STEPS FOR INVESTIGATIVE EXPERIMENTS ( FOR PAPER 3) N O 1

TYPES OF EXPERIMENT LIGHT

PRECAUTIONARY i. ii. iii.

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SPRING

i. iv.

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ELECTRIC

i. ii. v.

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HEAT

i. ii. iii. vi.

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MEASURING INSTRUMENTS Such as ammeter, voltmeter, meter rule…

i. ii.

Experiment must be carried out in darkened room Lens, screen and object must be in line Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ruler Make sure the sping is not loaded beyond the elastic limit ( spring return to original length when load is taken off) Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ruler All connections must be secure / tight Off the switch after reading are taken to prevent wire from heating up ( resistance increase) Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ammeter / voltmeter Liquid must be stirred constantly so that temperature rises evenly Alluminium block must be wrapped with insulating material to prevent heat lost Thermometer bulb should be smeared with oil to give better thermal contact with the block Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the thermometer Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale read Take into account zero of instrument

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Notes Physics

Program Cemerlang Bersama SM Teknik 2009

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