Module 1 Flashcards
(29 cards)
It is a branch of Physical Science which describes and predicts the conditions of rest or motion of bodies under the action of forces.
Mechanics
Three Division of Mechanics
- Mechanics of Rigid Bodies
- Mechanics of Deformable Bodies
- Mechanics of Fluids
Two Divisions of Mechanics of Rigid Bodies
- Statics
- Dynamics
It deals with bodies at rest.
Statics
It deals with bodies in motion.
Dynamics
Six fundamental principles of Mechanics based on experiments evidences:
- The Parallelogram Law for the Addition of Forces
- The Principle of Transmissibility
- Newton’s Three Fundamental Laws
- Law of Inertia
- Law of Acceleration
- Law of Action and Reaction
- Newton’s Law of Gravitation
This states that two forces acting on a particle maybe replaced by a single force, called the resultant, obtained by drawing the diagonal of the parallelogram which has sides equal to the given forces.
The Parallelogram Law for the Addition of Forces
This states that the conditions of equilibrium or of motion of a rigid body will remain unchanged if a force acting at a given point of the rigid body is replaced by a force of the same magnitude and same direction, but acting at a different point, provided that the two forces have the same line of action.
The Principle of Transmissibility
If the resultant forces acting on a particle are 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 Law of Inertia
If the resultant force acting on a particle is not zero, the particle will have acceleration proportional to the magnitude of the resultant and in the direction of this resultant force. F = ma.
Newton’s Law of Acceleration
The forces of action and reaction between bodies in contact have the same magnitude, same line of action and opposite sense.
Newton’s Law of Action and Reaction
This states that two particles of mass M and m are mutually attracted with equal and opposite forces F and F’ of magnitude F.
Newton’s Law of Gravitation
Formula of Newton’s Law of Gravitation.
F = GMm/r^2
What is the system of units used?`
International System of Units
By international agreement, the
standard meter had been defined as the _________________________-.
distance between two fine lines on a bar of platinum - iridium alloy
The 1960 conference redefined the meter as ________________.
1, 650, 763. 73 wavelengths of the reddish - orange light emitted by the isotope krypton - 86.
The meter was again redefined in 1983 as the ______________________________
length of the path traveled by light in vacuum during a time interval of 1 / 299, 792, 458 of a second.
When the metric system was created, the kilogram was defined _____________________.
as the mass of 1 cubic decimeter of pure water at the temperature of its maximum density (4.0 ̊C / 39.2 ̊F).
A ______________- was carefully made to match this quantity of water under the specified conditions.
solid cylinder of platinum
Later it was discovered that a quantity of water as pure or as stable as required could not be provided. Therefore the primary standard of mass became the ____________.
platinum cylinder
When was the platinum cylinder replaced by a platinum-iridium cylinder of similar mass?
1889
Platinum cylinder was replaced in 1889 by?
platinum-iridium cylinder
The ___________ redefined the meter as 1, 650, 763. 73 wavelengths of the reddish - orange light emitted by the isotope krypton - 86.
1960 conference
The meter was again redefined in _____ as the length of the path traveled by light in vacuum during a time interval of 1 / 299, 792, 458 of a second. Mass
1983
