Definitions to remember Flashcards
(56 cards)
definition of base unit
stand alone units from which other units are derived.
definition of a derived unit
products or quotients of base units
definition of scalar quantity
quantity that has magnitude only
definition of vector quantity
quantity that has magnitude and direction
definition of systemic error
an error that causes the readings to have a constant deviation from either sides of the actual readings.
definition of random error
an error that causes the readings to scatter around the mean value.
definition of distance
the total path traveled
definition of displacement
the shortest distance between the starting point and the end point.
definition of speed
the total distance traveled divided by the time taken
definition of velocity
the rate of change of displacement
definition of acceleration
the rate of change of velocity
definition of mass
- property of a body resisting changes in motion
2. quantity of matter in a body
definition of newtons first law
a body continues at rest or constant velocity unless acted upon by a resultant force
definition of newtons second law
the rate of change of momentum is proportional to the resultant force and is acting in the same direction as the resultant force.
definition of newtons third law
if body A exerts a force on body B, Body B will exert a force with an equal magnitude on body A but in opposite direction.
definition of momentum
product of mass and velocity
definition of principle of conservation of momentum
the total momentum of an isolated system of bodies is constant.
definition of force
rate of change of momentum
definition of conditions for equilibrium
- zero resultant force in any direction
2. zero resultant moment about any point
definition of center of gravity
the point on the body where the weight of the object is considered to act on.
definition of moment
the product of the force and the perpendicular distance from the point of moment to the line of action of force.
definition of couple
a pair of parallel forces with the same magnitude but are opposite in directions and they are not in line.
Definition of torque
product of one of the force of a couple and the perpendicular distance between the pair of forces.
definition of work done
the product of the force and the perpendicular distance of the force
