Difference between Gravitational and Buoyant force
Gravitational force
- The force exerted by planet which acts towards the centre of planet is known as gravitational force.
- Gravitational force is force of attraction which pulls every object in downward direction.
- Study of gravitational force is termed as ‘gravity’.
- Gravitational force is weakest force in the universe.
- According the Newton’s law of gravitation, “Every object in the universe attracts every other object with fixed force, which is directly proportional to product of masses of two objects and inversely proportional to square of distance between centres of object.
- The force by which planets are revolves around the sun, the force due to which the high tides and low tides are takes place in ocean water are some examples of gravitational force.
Buoyant force
- The perpendicular force exerted by liquid surface to oppose the motion of object falling in it is known as buoyant force.
- Buoyant force is the force by liquid which acts in upward direction.
- Study of buoyant force is termed as ‘buoyancy’.
- Buoyant force is stronger than that of gravitational force.
- According the Archimedes principal, “The magnitude of the buoyant force exerted by liquid is equal to the weight of liquid which is displaced by object of volume when it is immersed partially or completely in liquid.”
- Ships can float on the water surface, person can swim in water, weight of object decreases when it falls in water are some examples of existence of buoyant force.