Ch. 1 Some Fundamentals Flashcards
Newton’s 1st Law of Motion
Law of Inertia
With no net force acting upon it, an object at rest tends to stay at rest, & an object in motion tends to stay in motion.
Vector
Something with both size & direction, used to represent something graphically
Momentum
Mass of body multiplied by its velocity
Inertia
Resistance to change
Speed
Rate of change of distance per unit of time.
Units: Knots Indicated Airspeed (KIAS), mph, etc.
Velocity
Magnitude (speed) & direction
Acceleration
Rate of change of velocity
Moment
It is the reaction at a pivot point of a force multiplied by the distance from the pivot point that the force acts about.
Also known as torque.
Couple
Two forces acting in equal & opposite parallel directions.
Force
Ability to cause motion or change the direction of motion.
Units: foot-pounds, Newtons
Newton’s 2nd Law of Motion
The acceleration of an object is proportional to the force acting on it & inversely proportional to its mass.
F = m x a
The greater the mass of an object, the more force required to accelerate (move) it.
Energy
Ability to do work
Units: calorie, Joule, foot-pounds
Potential energy
Energy “stored” in a body with respect to a surface due to a height difference between a body & a frame of reference (or surface).
Kinetic energy
Energy due to motion
Power
Rate of doing work
Units: horsepower (550-foot pounds per second), kilowatts
