New Physics for You, pages 8, 362

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Presentation transcript:

New Physics for You, pages 8, 362 How Science works: Errors New Physics for You, pages 8, 362

About different types of errors, Learning Objectives You should learn : About different types of errors, How to reduce them when you are doing your practical work.

What is an error? An error is a mistake of some kind... …causing an error in your results… …so the result is not accurate.

Some are due to human error… What is an error? Some are due to human error… For example, by not using the equipment correctly Let’s look at some examples.

Human error Example 1 Professor Messer is trying to measure the length of a piece of wood: Discuss what he is doing wrong. How many mistakes can you find? Six?

Human error Measuring from 100 end 95.4 is the wrong number Answers: Measuring from 100 end 95.4 is the wrong number ‘mm’ is wrong unit (cm) Hand-held object, wobbling Gap between object & the rule End of object not at the end of the rule Eye is not at the end of the object (parallax) He is on wrong side of the rule to see scale. How many did you find?

Human error Example 2 Reading a scale: your eye Reading a scale: Discuss the best position to put your eye.

Human error 2 is best. 1 and 3 give the wrong readings. This is called a parallax error. your eye It is due to the gap here, between the pointer and the scale. Should the gap be wide or narrow?