00:01
As you know, as per newton's law motion, newton's first law motion, an object will keep moving in the same direction with the same speed or will remain at rest until unless an net external force is acting on it.
00:18
So we want to change either magnitude or direction of velocity.
00:39
Net force is required is required all right so this is the simplified version of newton's law motion all right so now we need to select the options in which the net force is required all right unbalanced force means net force so if it is sitting motionless motionless means no acceleration so a is not requiring any force okay so b it changes speed but no direction and that means magnitude is changing, so it requires a net force.
01:18
She says that continuously moving in a state finite constant speed.
01:21
That means neither magnitude, no direction is changing.
01:23
So this does not require any force.
01:26
D option.
01:28
Also state downwards at an ever -increasing speed.
01:31
Ever -increasing speed means magnitude is increasing.
01:33
That means it has a net external force.
01:35
Next, it moves in a curved orbital path due to gravity.
01:39
All right.
01:40
He also changes direction.
01:41
If it is changing direction, that means net force is present...