00:02
Hello students, we are given a question and we have to tell whether these statements are true or false.
00:08
So in the first part it is given that linear momentum.
00:16
So the linear momentum is conserved in all collisions.
00:27
So yes, this statement is true because if the collision is elastic or in elastic, the linear momentum always remains conserved.
00:39
Now in the second why it is given that momentum is conserved only when there is no friction.
01:03
This statement is false because the momentum of the whole system is conserved.
01:09
So momentum momentum of momentum of whole system is conserved in this case so this is a correct explanation so our following statement is false so now moving out to the third statement it is in this it is given that the energy the energy of a body of a body moving across a horizontal surface is an example of kinetic kinetic energy so it is true because anything which is moving and has mass must have kinetic energy so it is a correct example now moving out to the fourth part so in the fourth part it is given that the energy in water in water at the top of a waterfall is an example of is an example of gravitational potential energy so this statement is also true because a potential energy which the water will have at the top of the waterfall will be in the gravitational potential energy form.
03:14
So this is true.
03:17
Now moving on to the fifth part in it, the statement is a closed, in a closed system, in a closed system, the kinetic energy plus the potential energy is constant.
03:38
So this is also true because kinetic energy plus potential energy is constant.
03:44
Is a mechanical energy which always remains constant for a cross system...