Everyday Applications of Mechanics

Moment of Inertia

• A hard-boiled egg and a raw egg can be distinguished by their spinning motion.
• The PYQ relates the difference in spinning behaviour to the moment of inertia.

Centrifugal Force

• The centrifugal force acting on a person changes when moving from the pole towards the equator.
• The PYQ tests the relationship between the Earth's rotation and centrifugal force.

Work Done by Force

• The work done by a conservative force over a closed path is zero.

Power and Horsepower

• The unit horsepower (hp) is used to express power.
• 1 horsepower = 746 watts is the value used in the PYQ.

Rotational Motion in Everyday Appliances

• A spin-dryer removes excess water from clothes by rotating a perforated drum at high speed.
• The water droplets are separated from the clothes due to the effect associated with centrifugal motion.

Heat Transfer in Everyday Life

• On a cold morning, a metal surface feels colder than a wooden surface.
• The difference is related to the thermal properties and heat conduction of the materials.

Simple Machines and Mechanical Applications

• A garden roller is an example of a device involving rolling motion.
• The area covered by a roller