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IB SL Physics Comprehensive Notes

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IB SL Physics Comprehensive Notes - EVERY unit covered

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  • June 20, 2024
  • 98
  • 2023/2024
  • Class notes
  • Ib sl physics
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  • Secondary school
  • 12th Grade
  • Physics
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Measurements & Uncertainties

Units




Newtons & joules




1 newton = 1 kg * m * s-2

Moving the block for a meter:
1 joule = 1 newton * meter = 1 kg * m2 * s-2




Significant Figures
Rules
● Leading 0s - Not significant
● Captive 0s - Significant
● Trailing 0s - Significant only if the . is present
○ Shows the precision

, ● 5.56 - 3 s.f.
● 14.301 - 5 s.f.
● 0.0041 - 2 s.f.
● 0.0100 - 3 s.f.

● Note: for scientific notation, count the sig. figs. in the scientific notation form, not the
full form


Addition/Subtraction AND averages
● Answer should have same # of decimal places as the number with the smallest # of
decimal places

Multiplication/Division
● Answer should have same # of s.f. as the number with the smallest # of s.f.




Uncertainties
● When adding/subtracting, always add the ABSOLUTE uncertainties
○ Ex. 16.0 ± 0.1 + 12.4 ± 0.01
28.4 ± 0.11

● When multiply/dividing, add the PERCENT uncertainties
○ Ex.
○ Note that percent uncertainties should be to 1 sig fig

● When multiplying/dividing with a number with no uncertainty, multiply/divide the
ABSOLUTE uncertainty too
○ It's like adding the same thing x times

● When raising the uncertainty to a power, just multiply the PERCENT uncertainty by
the exponent
○ It's like multiplying the same thing x times




Vectors
● Write direction in square brackets
○ Ex. 50km/h [E]

● When subtracting vectors, just flip the negative one bozo

, ● There are 2 ways of representing direction:
○ [E 50o N]
○ [50o N of E]




● When calculating vectors, separate x & y components
○ Also define your positive directions




Mechanics
Mechanics = Kinematics (motion) + Dynamics (why things move)



Motion
● position (p)
○ A point in relation to another
○ Ex. my house is 5m [E] from me

, ● distance (s)
○ A scalar, the total distance traveled

● displacement (s)
○ The change in position of an object




● Speed
○ A scalar, distance moved by an object in a time period

● Velocity
○ Vector form of speed, includes direction




Position-time graphs
● A position-time graph shows how the position of an object from a point varies over time

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