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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?
Head to tail.
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?
Head to tail.
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?

Picture.
What is instantaneous velocity?

Picture.
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?

Picture.
What is the relationship between acceleration and displacement?

Picture.
What are the derived equations for constant acceleration?

Picture.

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