The motion The motion is the change of the object’s position ( location ) as the time passes according to the location of another object , The motion happens all around us , We...
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...
When a solid object moves in the air , A friction force arises between the object and the air , This type of the friction is called the air resistance and it acts in...
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