Energy Analysis. In a previous chapter of The

**Physics Classroom**Tutorial, the energy possessed by a pendulum bob was discussed. We will expand on that discussion here as we make an effort to associate the**motion**characteristics**described**above with the concepts of kinetic energy, potential energy and total mechanical energy.If you make this measurement carefully, you'll find that in 10 minutes, each of these stars moves through an angle of 2.5°. The rate of

**motion**is steady, so simple multiplication or division allows us to calculate the angle for any other time period: 5° in 20 minutes, 7.5° in 30 minutes, 15° in an hour.from its mean position during an oscillatory

**motion**is called the amplitude of oscillation. Angle of incidence Angle of an incident (arriving) ray or particle to a surface;**measured**from a line perpendicular to the surface (the normal) Angle of reflection Angle of a reflected ray or particle from a