LESSON 1& 2: GENERAL PRINCIPLES AND COMPONENTS OF FORCE Flashcards
(23 cards)
Defined as the science that describes and predicts the conditions of rest or motion of bodies under the action of forces
Mechanics
2 types of Mechanics of Rigid Bodies
Statics
Dynamics
A Mechanics of rigid bodies dealing with bodies at rest.
Statics
A mechanics of rigid bodies dealing with bodies in motion.
Dynamics
is the foundation of most engineering sciences and is an indispensable prerequisite to their study.
Mechanics
The basic concepts used in mechanics
Space, time, mass and force
For three-dimensional space problems, ________________ are needed.
three independent coordinates
is the geometric region occupied by bodies whose positions are described by linear and angular measurements relative to a coordinate system.
Space
For two-dimensional space problems, ____________ are required.
only two coordinates
is a measure of the inertia of a body, which is its resistance to a change of velocity.
Mass
What are the characteristics of Force
- its magnitude;
- he position of its line of action;
- the direction (or sense) in which the force acts along its line of action
is the action of one body on another and tends to move a body in the direction of its action
Force
is the measure of the succession of events and is a basic quantity in dynamics.
Time
A body is considered __________ when the change in distance | between any two of its points is negligible for the purpose at hand.
Rigid
is a body of negligible dimensions, and it is a body whose dimensions are considered to be near zero so that we may analyze it as a mass concentrated at a point
Particle
defined as that which changes, or tends to change, the state of motion of a body.
Force
If the resultant force acting on a particle is zero, the particle will remain at rest (if originally at rest) or will move with constant speed in a straight line (if originally in motion).
Newton’s First Law
If the resultant force acting on a particle is not zero, the particle will have an acceleration proportional to the magnitude of the resultant and in the direction of this resultant force.
Newton’s Second Law
The forces of action and reaction between bodies in contact have the same magnitude, same line of action and opposite sense.
Newton’s Third Law
This states that two particles of mass M and m mutually attracted with equal and opposite forces F and -F of magnitude F
Newton’s Law of Gravitation
is a modern version of the metric system which has received worldwide recognition.
SI Units| International System of units
The International System of units, abbreviated Sl after French “______________”
Systeme International d’Unites
a force, velocity, or other vector quantity that is equivalent to the combined effect of two or more component vectors acting at the same point.
Resultant
