Kinematics and Dynamics Flashcards
vector quantity has…
magnitude and direction
scalar quantity has…
only magnitude
dot product
A . B = |A| |B| cos θ
cross product
A x B = |A| |B| sin θ
vector of position, only final and initial taken into account
displacement
scalar of position, considers path taken
distance
velocity (v)
vector,
v = ∆X/∆t (m/s)
acceleration (a)
vector,
a = ∆v/∆t (m/s^2)
SI unit of force (F)
vector,
Newtons (N) = kg*m/s^2
gravitational force between two objects
Fg = (Gm1m2)/r^2
where:
G = 6.67E-11 N*m^2/kg^2
force that opposes movement between stationary object and surface
static friction (fs)
static friction (fs)
fs ≤ μs*N
μs = coefficient of static friction (depends on two materials)
N = normal force, component force perpendicular to plane of contact
force that opposes movement between sliding object and surface
kinetic friction (fk)
kinetic friction (fk)
fk = μk*N μk = coefficient of kinetic friction (depends on two materials)
amount of matter in an object (scalar)
mass