1.) If your hands are wet and no towel is handy, you can remove excess water...

1.) If your hands are wet and no towel is handy, you can remove excess water by shaking them. Use Newton's laws to explain why doing this gets rid of water.

2.) Newton's third law tells us that if you push a box with a 15 N force, it pushes back on you with a 15 N force. HOw can you ever acclerate this box if it always pushes back with the same force you exert on it.

Expert Solution

By shaking your hand, you are applying more force on the water drops sticking to the hand than the adhesive force of water with hand which detaches the water from the hand. As this adhesive force depends upon the size of the water drops sticking to the hand and is inversely proportional to the size, smaller size water drops do remain sticking and you have to wait till they evaporate out.

Edit:
Mr. Anil Bakshi drew my attention that you need explanation interms of Newton's law of motion. When the hand is shaken downwards, it imparts downward velocity to the water drops and due to inertia of motion, they continue to move downwards even when the hand is moved upwards after the downward shake and the force of adhesion is insufficient for it to get pulled back with hand in the upward motion of hand.

Newton's laws

In this section we will look at the effect of forces on objects and how we can make things move. This will link together what you have learnt about motion and what you have learnt about forces.

Newton's first law

Sir Isaac Newton was a scientist who lived in England (1642-1727) who was interested in the motion of objects under various conditions. He suggested that a stationary object will remain stationary unless a force acts on it and that a moving object will continue moving unless a force slows it down, speeds it up or changes its direction of motion. From this he formulated what is known as Newton's first law of motion:

Definition 1: Newton's first law of motion

An object continues in a state of rest or uniform motion (motion with a constant velocity) unless it is acted on by an unbalanced (net or resultant) force.

genius_generous answered 5 months ago

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