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UNIFORM CIRCULAR MOTION

In uniform circular motion,  1. Speed is constant. 2. Velocity is variable and acts along tangential direction  at a point. 3. Centripetal Force and acceleration act along the radius towards the centre if the circular path.  4. Centrifugal force appears to  act radially outwards. It is a virtual  ,fictitious force, not a real force.

Universal law of gravitation

 Any two masses in the universe attract each other with a force which is  i) directly proportional to the product of the masses, ii) inversely proportional to the square of the distance between their centres. F=GmM/r²  where G= universal gravitational constant. m and M are the masses of two bodies. r = distance between them.  * Larger the masses , greater is the force between them. * Larger the distance , smaller is the force. * If the distance is halved , force increases 4 times. * If the distance is doubled,  force becomes one-fourth. * The force is not effected with any medium between the masses. 
 Class 10                                                                     Marks: 20 Physics Revision ATTEMPT ALL QUESTIONS. Define moment of force. Write relationship between the SI and CGS unit of moment of couple. 2 Find the mass of the scale in equilibrium .                                          Draw diagrams and locate the centre of gravity  of hollow cone and triangular sheet. 2  State the  type of work done by a coolie  when i)  he lifts a load up ii) when he moves on a horizontal platform carrying load on his head.     2 A force is applied on a body of mass 20kg movong with a velocity of 40 m/s. The body attains a velocity of 50 m/s in 2  s. C...