State the type of motion described by each of the following. (a) The movement of a pendulum in a clock. [1] (b) The movement of a drill bit in a pillar dril...
Question 1 Report
State the type of motion described by each of the following.
(a) The movement of a pendulum in a clock. [1]
(b) The movement of a drill bit in a pillar drill during operation. [1]
(c) The movement of the blade on a jigsaw during cutting. [1]
[Total: 3 marks]
Answer Details
(a) The movement of a pendulum in a clock is oscillating motion. [1] The pendulum swings back and forth through a fixed arc, repeatedly reversing direction at each extremity. It does not travel in a straight line or complete a full circle; instead it sweeps through the same arc continuously, converting potential energy to kinetic energy and back at each swing.
(b) The movement of a drill bit in a pillar drill is rotary motion. [1] The drill bit spins continuously around a fixed axis (the spindle centre line). The electric motor drives the chuck, which holds the bit, in an unbroken circular path at a set speed (rpm). Every point on the drill bit follows a circular path about the axis of rotation.
(c) The movement of a jigsaw blade during cutting is reciprocating motion. [1] The blade moves repeatedly up and down in a straight line through exactly the same path. Unlike oscillating motion (which sweeps through an arc), reciprocating motion follows a linear track, reversing direction at each end of the stroke. The motor converts its rotary output through a crank mechanism to produce this linear back-and-forth cutting action.
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