Can an ordinary object, like a motorcycle, be mass-less? yes or no

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

the rearrangement of particles in a physical change. hope this

the components of a vector are the parts of the vectors that are to each other.

b perpendicular