Day One Tech Flashcards
Scalar
a quantity that represents only magnitude, e.g., time, temperature, or volume
Vector
is a quantity that represents
magnitude and direction
Displacement
) is the distance and direction of a body’s movement
Velocity
) is the speed and direction of a body’s motion, the rate of
change of position
Speed
is a scalar equal to the
magnitude of the velocity vector
Acceleration
) is the rate and direction of a body’s change of velocity (gravity accelerates bodies toward the center of the earth at 32.174 ft/s2 )
Force
is a push or pull exerted on a body (1,000 lbs of thrust pushes a jet through the sky)
Mass
) is the quantity of molecular material that
comprises an object.
Volume
is the amount of space occupied by an object
Denisty
is mass per unit volume. It is expressed:
volume
mass
ρ = m/v
Weight
) is the force with which a mass is attracted toward the center of the earth by gravity.
Force
is mass times acceleration
Moment
is created when a force is applied at some distance from an axis or fulcrum,
and tends to produce rotation about that point. A moment is a vector quantity equal to a force
(F) times the distance (d) from the point of rotation that is perpendicular to the force (Figure
1-1-2). This perpendicular distance is called the moment arm.
Work
is done when a force acts on a body and moves
it. It is a scalar quantity equal to the force (F) times the
distance of displacement (s)
W = F * s
Power
is the rate of doing work or work done per unit
of time.
P = W/t