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Bill Robertson, Ph.D. - Classes
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Physical Science ConceptsNewton's LawsLaw of Inertia - An object at rest tends to stay at rest and an object in motion tends to stay in motion. F = ma - Acceleration of an object is dependent upon 2 variables; the force on an object and the mass of the object. Opposite and Equal Reaction - For every action there is an equal and opposite reaction MotionMotion - variety of quantities used to describe the physical world: distance, speed, velocity, acceleration, force, mass, momentum, energy, work, power Work - force acting upon an object to cause displacement. W=f*d*cos0 f=force, d=displacement, 0=theta, angle of the vector. Mechanical Energy - energy possessed by an object due to its motion or its stored energy of position. Can be both potential and kinetic. Measured in Joules. Potential Energy - stored energy of position. PS=m*g*h, m=mass, g=gravitational constant (10m/s/s), h=height. Measured in Joules. Kinetic Energy - energy of motion. KE=1/2*m*v2(squared), m=mass, v=speed Power - work divided by time, measured in Watts. ForcesGravity vs. Lift and Drag (friction) vs. Thrust - most easily recognized in the way and airplane takes of in flight Centripetal force - "Center Seeking", force required giving the centripetal acceleration that moves a body along a curved path. It is directed towards the center of a curve on a path. Only Centripetal is a "real force" Centrifugal force - "To flee from the center", force felt by a body moving along a curved path, tendency of an object to go in a straight line. Moment of Inertia - Magnitude of each element of mass by the square of the distance from the axis. In that sense, the closer the mass to the center (or axis), the greater the moment of inertia, and the farther the mass from the center (or axis), the less the moment of inertia. |
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Bill Robertson, Ph.D. (robertson@utep.edu) Teacher Education Department, College of Education, University of Texas at El Paso |