Classify the following as motion along a straight line, circular or oscillatory motion: Motion of the hammer of an electric bell.

The motion of the hammer in an electric bell is oscillatory. When the bell is activated, the hammer rapidly moves back and forth within a small space. It strikes the bell, then retreats to its initial position due to the internal mechanism. This repetitive to-and-fro movement defines the oscillatory motion of the hammer in an electric bell, producing the ringing sound as it strikes the bell repeatedly while the bell is in operation.