Definitions (Force)

FORCE

Force: it is defined as a pull or push that changes or tries to change the state of rest or uniform motion of a body in straight line.

Gravitation: The mutual force of attraction between any two bodies in this universe is called gravitation.

Universal Gravitational Constant: It is defined as the force of attraction between any two unit masses separated by unit distance. Its value is 6.67×10^-11 Nm²/kg².

Gravity: It is the force by which a body is attracted towards the center of earth or any other heavenly body.

Acceleration due to gravity: It is defined as the acceleration produced in a freely falling body due to gravity. Its value on the earth is 9.8 m/s².

Conclusion of Guinea and feather Experiment: It confirms that “acceleration due to gravity of freely falling bodies, whatever their masses, is the same in the absence of air resistance.”

Gravitational field: It is defined as the region around the heavenly body up to which its gravitational force is experienced by other bodies.

Gravitational Field Intensity: Gravitational field intensity at a point is defined as the force experienced by unit mass placed in a gravitational field.

Mass: The quantity of matter contained in a body is called mass.

Weightlessness: It is the condition of the body when its weight seems to be zero.

Free-fall: When a body falling freely towards the center of earth under the influence of gravity of the earth, the motion of the body is called free-fall.

Null point: The point in the space where the value of acceleration due to gravity is zero.