Gravity Flashcards
What is the Universal Law of Gravitation
Every object in the universe attracts every other object with a force which is equal to the product of their masses and inversely propotional to the distance square
What is centripetal force?
a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.
universal gravitational Constant
F = GMm/dxd
Definition of universal gravitational constant
the gravitational force between two objects of unit masses and separated by a unit distance apart
SI unit of G
Nm^2Kg^-2
Value of G
6.673 x 10^-11Nm^2Kg^2
Newton’s gravitational law is also known as 1:? and 2:?
1: inverse-square law, 2: universal law
What is free fall?
Whenever objects fall down towards the earth under the action of gravitational force of earth alone.
Acceleration due to Gravity?
9.8m/s^2
3 equations of motion of freely falling bodies
1: v = u + gt
2: h = ut + 1/2at^2
3: v^2 - u^2 + 2gh
When a body is vertically thrown upwards, what happens with its acceleration due to gravity and its final velocity
1: acceleration due to gravity becomes negative (-9.8m/s^2)
2: Its final velocity becomes zero
Differentiate between Mass and weight
Mass is the quantity of matter contained in a body. Weight is the product of mass x acceleration due to gravity
Weight of object on moon
1/6th of its weight on earth
Pressure?
Thrust/Area
What is Thrust
the force acting on any surface in a direction perpendicular to the surface.
What is Buoyancy?
When a body is fully or partially submerged in a fluid, an upwards force acts on it. It is called buoyant force. Where the mass of the spilled fluid is equal to the volume of object which is submerged.
