force

push or pull

net force

combination of all forces acting on an object & changing its motion

tension

stretching force

vector

arrow that represents magnitude & direction

vector quantity

amount that needs direction & magnitude

scalar quantity

only described by magnitude (time, area, volume)

mechanical equilibrium

state of steadiness when net force is zero

support force

upward force that balances weight of an object on a surface

resultant

sum of two or more vectors

static equilibrium

not moving

dynamic equilibrium

moving

What two quantities are necessary to determine a vector quantity?

Magnitude and direction

An example of a vector quantity

force

An example of a scalar quantity

time, area, volume

What does εF=0 mean?

It means all the forces acting add to zero

What is the net force on an object at rest?

Zero