Question

all the formula of forces and laws of motion for grade 9​

Answer 1

(1) 1st equation formula -v=u+at
(2) 2nd equation formula -s=ut+1/2at^2
(3)3rd equation formula -v^2=v^2+at
(4)momentum=mass × velocity
(5)force=mass ×acceleration
(6) acceleration =change in velocity /time take
(7)speed =distance /time

Answer 2

Explanation:

• Three equations of motion(only valid when there is constant acceleration):

$v=u+at\\s=ut+1/2\times at^{2}\\v^{2}-u^{2}=2as$

• Newton's 2nd law of motion:

$F=m\times a$

• Gravitational force:

$Gravitational\ force=F_{g}=Gm_{1}m_{2}/r^{2}\ where,\\G=universal\ gravitational\ constant\\m_{1} \ and\ m_{2}\ are\ two\ masses\between\ which\ F_{g}\ acts\\r=distance\ between\ two\ masses$

$Acceleration\ due\ to\ gravity(g)=GM/r^{2}\\\\Law\ of\ conservation\ of\ linear\ momentum=m_{a}u_{a}+m_{b}u_{b}=m_{a}v_{a}+m_{b}v_{b}\\\\Equations\ of\ motion\ under\ free\ fall\ or\ gravitational\ force:\\v=u+gt\\h=ut+1/2\times gt^{2}\\v^{2}-u^{2}=2gh$

• $W=mg$