Recent content by Ali Hamaiz

I got it thanks .

This means with the sign of Vi you decide the value of g to be positive or negative.

I know that in formus there are many answers about this question .I just want the value of g (will it be positive or negative) in this example which I am going to give , I threw a ball vertically upward the value of g at its max height (vi=0) ,what will be the value of g +10 or -10 m/s^2. I...

I know get it , the conclusion is that yes there is impulse when the collision is with the air molecules but we do not consider it because there magnitudes are small . Appreciated your answers , Thanks.

@fresh_42 So this means that there will be no impulse acting on a body during collision with the ground and to define these terms we use friction not the impulse .But can we say there is impulse as the momentum of a body is transferred to the air molecules (if we get to measure the rate of...

I know there are many websites on Internet but I can not understand any. My teacher says impulse is only during a collision of one body with other (when a car collide with other car etc.). My question is will there be impulse when a body is accelerating , when it collides with the air molecules...

What will be the conclusion , will the law of conservation of momentum hold in an non isolated system .

@BvU what are you talking about the direction?

Is the law of conservation of momentum valid in non isolated system . What is an isolated system? My teacher confuses me that the law is valid in an non isolated system . They even say that when we say about the isolated system (meaning they are present ) we do not consider the air resistance...

I understood everything :) , thanks great explanation .

I get it cutter ketch what you said and the conclusion is a moving body does not possesses impulse but i am confused will it have impulse during a collision or it will act on it . Thanks ,

We generally consider impulse during a colliion but if a body is simply accelerating e.g a car moving with a acceleration will it have impulse? [SIZE=16px]If a body has an acceleration it may have a change in velocity there will be impulse and if moving with uniform velocity it may not have...