(credit: NASA/Kathy Barnstorff) Terminal Velocity Smoother “skin” and more compression forces on a swimmer’s body provide at least 10 % 10 % less drag. When taking into account other factors, this relationship becomesįigure 6.31 Body suits, such as this LZR Racer Suit, have been credited with aiding in many world records after their release in 2008. We can write this relationship mathematically as F D ∝ v 2. For most large objects such as cyclists, cars, and baseballs not moving too slowly, the magnitude of the drag force F D F D is proportional to the square of the speed of the object. This functionality is complicated and depends upon the shape of the object, its size, its velocity, and the fluid it is in. Unlike simple friction, the drag force is proportional to some function of the velocity of the object in that fluid. Like friction, the drag force always opposes the motion of an object. You feel a smaller drag force when you tilt your hand so only the side goes through the air-you have decreased the area of your hand that faces the direction of motion. The faster you move your hand, the harder it is to move. You might also feel it if you move your hand during a strong wind. You feel the drag force when you move your hand through water. Determine an object’s terminal velocity given its massĪnother interesting force in everyday life is the force of drag on an object when it is moving in a fluid (either a gas or a liquid).Describe applications of the drag force. By the end of this section, you will be able to:
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