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3 forces acting on a body F_{1}F_{2}F_{3} on mass m and F_{1 }is reversed in direc. then a=
2f_{1}/m


normal to surface ;mv=
2mvcos*

change in the movementum when the ball bounces (daily)
m(v+u)

in circle change in movementum
2mvsin*/2

general formulae for force
m dv/dt+v dm/dt

inertial mass of the body
F/a

apparent weight of a body in lift when it is moveing up
w=m(g+a)

apparent weight of a body in lift when it is moveing down
w=m(ga)

inside a train,effective a is
root g^{2}+a^{2}

