The factors affecting the friction between the solid objects and the water
The water resistance
When any object moves through the water ( such as the fish , the swimmer , the dolphin and the ship ) , There is a friction force arises between this object and the water which is called the water resistance .
The direction of the water resistance is in the opposite direction of the movement , So , the movement of the fish , the dolphin , the swimmer and the ship is in the opposite direction of the water resistance .
When you look at the fish , you will notice that the fish have the streamline shapes , The streamline shapes are very important to decrease the water resistance and also the ships are designed in the streamline shapes to decrease the water resistance ( in the sea , the oceans and the rivers ) .
Do you know the factors affecting the water resistance ?
The factors affecting the water resistance are the speed of the body through the water and the surface area of the body .
The water resistance increases by increasing the speed of the body through the water , and vice versa , The water resistance increases , by increasing the surface area of the body that moves through the water , and vice versa .