Force
Gravitational force:
Any two masses in the universe attract each other with gravitational force.
Factors of gravitational force:
Size of Masses. Distance between centre of masses. It is directly proportional to the size of mass.
F ∝1/d²
Gravitational force is inversely proportional to the square of distance between the centre of masses
The region in the space around the mass up to which its gravitational force is noticeable is called its gravitational field of the mass.
Gravitational field strength:
Gravitational force exerted on 1 kilogram mass by a gravitational field is called gravitational field strength(g). Gravitational field strength=gravitational force/mass
g=F/m
it is a vector quantity and the SI unit is N/Kg
g on earth =10N/Kg
g on moon=1.6N/Kg
Weight (W):
The total gravitational force acting on a object is called its weight
w=mg
Difference between mass and weight:
Mass:
The amount of matter in an object. It is a scalar quantity. Mass of an object is constant. SI unit is kg. Beam balance, top pan balance, electronic is used to measure mass
Weight
The total gravitational pull on an object is its weight. It is a vector quantity. Weight of an object varies from place to place.SI unit is Newton
Newton metre is used to measure the weight.
Force is a vector quantity that represents the interaction between objects, causing a change in their motion or deformation. It is typically described by its magnitude (strength) and direction. Force can cause an object to accelerate, decelerate, or deform.