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Glossary of MCAT Physics 2

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What is a unit?
A well-defined quantity with which other quantities are compared in a measurement.
What are the two different types of units?
1. Derived -- those made in terms of other units. 2. Standard -- those which are compared to a standard.
What are the three SI units for mechanics?
1. meter 2. kilogram 3. second
Kilo?
10^3
Mega?
10^6
Centi?
10^-2
Milli?
10^-3
Micro?
10^-6
Nano?
10^-9
Pico?
10^-12
What are the components of a vector?
The projection of a vector on a Cartesian (x,y) coordinate system.
How do you resolve a vector to Cartesian x-coordinates?

This formula
When resolving components, how are the x and y components arranged?
How do determine the magnitude of a vector from Cartesian coordinates?

This formula
How do you determine the direction of a vector from Cartesian coordinates?

This formula
When adding vectors geometrically, how are they arranged?
What happens when you put a negative sign on a vector?
It maintains its magnitude but changes its direction by 180 degrees.
How do you add vectors algebraically?
1. Resolve vector into x and y components. 2. Add x-components and y-components together. 3. Convert to magnitude-direction if necessary.
What is average velocity?

Picture.
What is average speed?

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What is instantaneous velocity?

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What is instantaneous speed?
Speed is velocity without direction, It is the scalar component [magnitude] of velocity.
What is average acceleration?

Picture.
What is instantaneous acceleration?

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What is the relationship between acceleration and displacement?

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What are the derived equations for constant acceleration?

Picture.

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