eguruchela


Attractive Forces


m1,m2: mass of two objects; r: distance between two objects; G: gravitational constant


pic


c24


c25


Gravitational Force


M: Earth mass, m: mass of object, R: Earth radius, h: object’s height


c26


c28


c29


Gravitational Acceleration


At a height h above the normal surface of the earth

c30


Near the sea level


c21


Force Of Gravity


Force of gravity on earth, a special case of Gravitational force

c40


Newton's First Law


F: forces acting on the object , v: velocity of the object, a: acceleration of the object

c41

42

Newton's Second Law


m: object’s mass(kg)

43

44

45

Newton's Third Law


47

Linear Elasticity-Hooke's Law


K: spring constant (n/m), x: displacement(m)

48

pic

A Mass suspended by a spring

49

Force Of friction


µ: coefficient of friction, N: normal force

pp26

            Fms = µN
                = µPcosα
                = µmgcosα