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Physics Units

Physics Autumn Y12

QuestionAnswer
Why is scientific notation useful Means the significant figures isn't ambiguous
What is a quantity? A measurement of the amount of something AND its unit
Why is 'measure the amps' wrong Should be 'measure the current'
What are SI units? The accepted international units
What are the 7 Fundamental SI units (base units) Luminous intensity - cd (candela - we won't be using it, but important to know of) Amount of substance - mol Electrical current - A Temperature - K Time - s Length - m Mass - kg
Why are those SI units fundamental? Can be used to make all other units
For all calculations questions with suffixes Convert to normal indices as soon as possible or lose working marks
Main indices suffixes Tera - T 12 G M k Deci - d -1 Centi - c -2 (all lower case below)
What are becquerels? Count rate - number of decays per second (1 per Bq)
What does it mean for both sides of an equation to be homogenous? Both sides are the same
How to check if both sides of an equation are homogenous Check to see that the units of both sides are the same (base units probably required, but you can keep other ones). If the units are the same, the equation MAY be correct, ruling out incorrect equations. As before, remove pure numbers (have no dimensions)
When demonstrating how both sides of equation homogenous Use square brackets around each of the terms, then draw arrows away from them and break down what units are for each term. Combine together the left hand side and label LHS. Same for RHS. Then say LHS = RHS
Created by: Pyrogearos2
 

 



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