Statics

mechanics

forces acting on a system

Rigid body

Doesn’t deform under force, relative points don’t move under force

deformable body

Deforms under forces, relative points move under force

Newtons 1st law

that an object at rest stays at rest, and an object in motion stays in motion at a constant speed and in a straight line, unless acted on by an unbalanced force

Newtons 2nd law

F = ma

Newtons 3rd law

equal and opposite response, also colinear

is weight a form of mass

no

conversions do we need to know conversions?

ask karnaparthi

clockwise angles…

negatives are ok

Counterclockwise angles……

negatives are not ok, add 360

Quadrant I condition

angle is correct as-is

Quadrant II condition

add 180° to arctan angle

Quadrant III condition

add 180° to arctan angle

Quadrant IV condition

negative angle; keep it if clockwise, convert if CCW

X, y, and z all make an angle with….

the resultant vector

how to add vectors

use a²+b²…..=c²

how to get unit vector

Divide each component by the total magnitude

unit vector tell?

Direction

what is the function always used with 3-D vector problems

Cosine