- Messages
- 19
- Reaction score
- 3
- Points
- 0
micrometer : can measure the thickness of any small thing to 0.01 mm
vernier : can measure the inner and outer wall of anything to 1.05mm
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question
Statements & justification
The rest are calculations and measurements
To produce more accurate or reliable results:
• Repeat experiment, to calculate average reading.
• Avoiding parallax error, look perpendicular to the ruler.
• If accuracy in measurement was asked, check for zero error.
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.
Heat loss could be reduced by:
• Insulation of beaker.
• Covering beaker with a lid.
For 2 values to be directly proportional,
• The graph of the values must be a straight line from the origin.
• As value 1 increase, value 2 increases.
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.
*If values have difference by 0.1 or 0.01, that is the limit of experimental accuracy, so answers are about the same.
For spring extension experiment, variables that should be constant in the experiment:
• Number of coils.
• Diameter of spring.
• Selection of loads.
• Mass of spring.
vernier : can measure the inner and outer wall of anything to 1.05mm
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question
Statements & justification
The rest are calculations and measurements
To produce more accurate or reliable results:
• Repeat experiment, to calculate average reading.
• Avoiding parallax error, look perpendicular to the ruler.
• If accuracy in measurement was asked, check for zero error.
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.
Heat loss could be reduced by:
• Insulation of beaker.
• Covering beaker with a lid.
For 2 values to be directly proportional,
• The graph of the values must be a straight line from the origin.
• As value 1 increase, value 2 increases.
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.
*If values have difference by 0.1 or 0.01, that is the limit of experimental accuracy, so answers are about the same.
For spring extension experiment, variables that should be constant in the experiment:
• Number of coils.
• Diameter of spring.
• Selection of loads.
• Mass of spring.
