According to the Newton third law every action has an equal and opposite reaction. So my doubt is when we lift a box we extract a force on it. So according to the Newton's third law the box have to be extract equal and opposite force on us then the force become balanced force So how we lift the box?
Dear Student,
According to the Newton third law every action has an equal and opposite reaction.Here , consider a box of mass m.So the weight of the box will be,
W = mg
Now when we try to lift the box, it will be the maximum reaction force exerted by the box on our hands.Now the action and reaction are equal.So the box will stay at the ground.But we can exert more force(If mass of the box m is small) on the box if we are strong.So the forces become unbalanced.When we apply a force, f > mg we will be able to lift the box.
Regards.
According to the Newton third law every action has an equal and opposite reaction.Here , consider a box of mass m.So the weight of the box will be,
W = mg
Now when we try to lift the box, it will be the maximum reaction force exerted by the box on our hands.Now the action and reaction are equal.So the box will stay at the ground.But we can exert more force(If mass of the box m is small) on the box if we are strong.So the forces become unbalanced.When we apply a force, f > mg we will be able to lift the box.
Regards.