# Lala

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Physics
Scientific notation: removes ambiguity as to the significant figures
Scientific notation is used with large number like 0.000008 is 8x10-6m or 1500 is 1.5x10-3 it has coefficients and power of ten so in 1.5 its coefficient is 1.5
Mm a CM a dm a m a Dm A Hm a Km
So steps fro the scientific method is first the observation then you have to sate a hypothesis after it you have toexperiment if the result is wrong you have to do it back again and modify the hypothesis but if it is right you analyze the results and then you make the conclusion, an example 1.is that a blender doesn’t work when plugged in, 2.so you think the blender motor is broken or the pug has malfunctioning 3. then the connect the blender into and other plugged 4. if it does work you have to repair it
Mass:kilogram: kg
Length: meters: m
Time: seconds: s
Temperatures: Kelvin’s: k
Amount of substance: mole: mal
Electronic current: ampere: a
Volume: the most commonly used metric unit for volume are the litter and millimeter
Uncertainty in measurements: different measuring devices have different uses and degrees of accuracy. There is the number and the percentage uncertainty the number
Examplenumber: 9.992=0.001 6.75:0.01 1.2=0.1 35.675: 00.001
Percentage: uncertainty/value*100 examples
Examples: 5.2 its uncertainty is 0.01 / 5.2 x 100
Expetions uncertainties 9.9=0.1 the ones ended in ceros are 3500= 100 100=10 and the enteries ended 8989:0001
Example
Precision: how close a measure number is to other measured numbers
Accuracy:how close a measured number is to the true value or results
Rounding of number: answers must have the same number of significant figures as measured numbers, rounding rules are usually applied to obtain the correct number of significant figures
Metric system: prefixes that convert the base units into units that are appropriate for the item being measures , 1000 meters: 1 kilometerSignificant figures: the last number is almost always estimated if the device doesn’t chose the amount of it we accept the value
1. Non zero digits: significant
2. sandwiched zeros: significant
3. Zeros at the beginning of the number: no significant
4. Zeros at the end of the number, after a decimal significant
For operations you rounding 5 to up you ad less letthe number the same when the uncertainty is no given in the operation in the result you put the same numbers as the part of the operation with least significant figures
Significant operations: in operations with measurements your result with be only be as good as your worst measurement, the worst number is the one with less decimal place , so we round up the measurement
Exact number: has nouncertainty, whole number, like hours or 567 pages
Measured number: have decimals and a uncertainty like 2.5 pounds not sure like weight and
Sl unit:
Mega : M : 1000000
Kilo : K : 1000
Hecto : H : 100
None : N : 1
Centi : 0.01
Mili : m : 0.001
Micro :0.000001
Uncertainty : in my last number for example 5.2
Describing motion kinematics in one dimensions
Reference frames andvelocity: Any measurement of position, distance, or speed must be made with respect to a reference frame. For example, if you are sitting on a train and someone walks down the aisle, their speed with respect to the train is a few miles per hour, at most. Their speed with respect to the ground is much higher. We make a distinction between distance and displacement. Displacement (blue line) is how farthe object is from its starting point, regardless of how it got there. Distance traveled (dashed line) is measured along the actual path.
displacement is fx= x2-x1
displacement is positive
displacement is negative

Average velocity
Speed: how far an object travel in a given time
Average speed: distance travelled/ time elapsed
Velocity includes directional information
Av velocity:...