Answer:
For a (1) net force will be greater than the weight of the ball
For b (2) net force will be lesser than the weight of the ball
Explanation:
For (a):
For a linear motion of a system, one must have to understand, according to Newtons first law of motion, which is also known as law of inertia, a body which is at motion will continue to move or a body at rest will continue to rest until an external force is applied to it. In the given case, when ball goes upward, one thing is for sure, the net force is greater than the weight of the ball, because three forces are applied during upward motion:
gravity or weight which is pulling the ball downward,
air resistance, which is also acting downward as it is creating friction between ball and air molecules, so creating hindrance in upward motion
External force to throw ball upward
So
Net Force = Upward force - Air friction - Weight
Since ball is going upward, so net force is greater than both weight and air friction which are pulling ball downward.
For (b):
For a linear motion of a system, one must have to understand, according to Newtons first law of motion, which is also known as law of inertia, a body which is at motion will continue to move or a body at rest will continue to rest until an external force is applied to it. In the given case, when ball goes downward, one thing is for sure, the net force is lesser than the weight of the ball, because two forces are applied during downward motion:
gravity or weight which is pulling the ball downward,
air resistance, which is acting upward as it is creating friction between ball and air molecules, so creating hindrance in downward motion
So
Net Force = Weight - Air friction
Since ball is going downward, so weight is greater than net force which is in this case is air friction which is pulling ball upward.
