Newtonian Mechanics and Forces

The correct answer is 'increases' because when a person stands up on a swing, their center of mass moves higher, effectively shortening the length of the pendulum. For a simple pendulum, frequency is inversely proportional to the square root of its length (f = 1/2π × √(g/L)). Shorter pendulum length means higher frequency of oscillation.

Sunlight is electromagnetic radiation, not a force. Push and pull are fundamental ways forces manifest, and gravity is a natural force that attracts objects with mass toward each other. Forces involve push or pull interactions that can cause acceleration, whereas sunlight is energy in the form of electromagnetic waves.

Newton is the SI unit of force, defined as the force required to accelerate a 1 kg mass at 1 m/s². Acceleration due to gravity is measured in m/s², velocity in m/s, and momentum in kg·m/s. This is a fundamental unit in physics named after Isaac Newton.

Weight of a body changes with place.

Those physical quantities that possess only magnitude but no specific direction are called scalar quantities. Distance is a scalar quantity.

All are showing multiple motions. Ball moving along the ground shows rotatory and rectilinear motions. Earth shows rotatory and translatory motions. Drilling machine rotatory and downward translator motions.

A motion in which an object describes to and fro or back and forth motion along the same path. This is the correct option.

When a ball hits the ground, it exerts a force on the ground, and the ground exerts an equal and opposite force on the ball, causing it to bounce. This is an application of Newton's Third Law.

Since force and displacement vector are perpendicular to each other when a body is moving in a circular path, so work done is 0 since we know that work done is the dot product of force applied and displacement of the particle.

Translatory motion occurs when all points of a body move in the same direction with the same velocity. This can apply to any finite size body, regardless of its shape.

This is the correct option. The motion of a potter's wheel along its axis is an example of rotatory motion.

This is the correct option. A drill cutting through a metal piece is an example of motion of rotation and motion of translation occurring at the same time.

This is the correct option. The needle of a sewing machine moving up and down is an example of oscillatory motion.

Archimedes' principle states that an object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. A balloon rises because the gas inside is less dense than the surrounding air, creating a buoyant force greater than its weight.