For finding momentum, you can use the formulaP=mv
For finding final velocity , you can use , the kinematic equation v^2 = u^2+ 2as
and to find that a , use a = f ÷m
But it is conserved unless an external force acting on it?In this case a sand bag is placed suddenly.Then there must be a force exerted by sandbag on the cart.
What do we call force? In simple words force is a pull or push on object.
we are standing on the surface of the earth. Because of a force exerted by it. So that force pulls us down. Hence we stand on the surface of the earth.Obviously this force is nothing but gravity.
so I conclude that...
Please explain this. How could you say it is static?
So far I can imagine that the car is moving , it isn't at rest.Hence there's kinetic friction.
From which frame of reference it is static?
Let me explain it through simple equations
N pull = mg - F cosθ
N push = mg+F cosθ
so these equations show that pulling is easier than pushing.
But in practical life , I feel pushing is easier.So that's my question.
Could you please explain the term 'co-efficient of static friction'?
why do the banking of roads or tracks depend of co-efficient of static friction?and not on the co-efficient of kinetic friction?