1 FUNDAMENTAL QUANTITIES OF MECHANICS 2 Fundamental Quantities
3 Fundamental Quantities
geometric region in which the physical events of interest in mechanics occur
region extends without limit in all directions
points in space can be determined relative to some reference system
types of reference systems
4 Fundamental Quantities
an interval between two events
solar year time for earth to orbit the sun
periodic vibrations of isotope cessium 133 (an atomic clock)
5 Fundamental Quantities
any substance that occupies space
body matter bounded by closed surface
inertia property of a body that causes it to resist change in motion
mass quantitative measure of inertia
6 Fundamental Quantities
the action of one body on another
contact forces a push or pull directly on a body
levers rods cables
bodies at a distance forces of attraction or repulsion
gravity magnetism atomic
7 Newtons Laws of Motion
1st Law A particle originally at rest will remain at rest a particle originally moving with a constant velocity will continue to move with a constant velocity along a straight line unless the particle is acted on by an unbalanced force.
8 Newtons Laws of Motion
2nd Law When a particle is acted on by an unbalanced force the particle will be accelerated in the direction of the force the magnitude of the acceleration will be proportional to the force and inversely proportional to the mass of the particle.
9 Newtons Laws of Motion
3rd Law For every action there is an equal and opposite reaction. The forces of action and reaction between two contacting bodies are equal in magnitude opposite in direction and collinear.
an object whose size and shape can be ignored when studying its motion (or lack of motion)
only the position of the mass center of the particle need be considered
orientation rotation and size play no role in describing the motion of the particle
System of Particles
two or more particles making up the object of interest
the distance between centers of mass of the individual particles may change with time or space
a system of many (infinite number) particles in which the relative position of the particles comprising the body remain constant at all times and under all loads
the size and shape of the body remain constant
a system of many (infinite number) particles in which the relative position of the particles comprising the body does not remain constant at all times and under all loads
the size and shape of the body change under load
14 Mass / Weight
Mass of a body
an absolute quantity independent of the position of the body and independent of the surroundings in which the body is placed
Weight of a body
the gravitational attraction exerted on the body by another massive body (the earth the moon etc.)
15 Mass / Weight m1 Fg r Fg m2 16
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