A skydiver weighing -650N is freefalling against a resistance from the air equivalent to +650N which of the following is trueA) the skydiver is under a static conditionB) the skydiver is under dynamic conditionC) the skydiver is not yet terminal velocityD) the skydiver is increasing his/her velocity
Question
A skydiver weighing -650N is freefalling against a resistance from the air equivalent to +650N which of the following is trueA) the skydiver is under a static conditionB) the skydiver is under dynamic conditionC) the skydiver is not yet terminal velocityD) the skydiver is increasing his/her velocity
Solution
The correct answer is A) the skydiver is under a static condition.
Here's why:
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The skydiver's weight is -650N. This is the force due to gravity acting downwards on the skydiver.
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The resistance from the air is +650N. This is the force due to air resistance acting upwards on the skydiver.
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When these two forces are equal in magnitude but opposite in direction, they cancel each other out. This means the net force acting on the skydiver is zero.
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When the net force acting on an object is zero, the object is said to be in equilibrium or under a static condition. This means the skydiver's velocity is constant and they are not accelerating or decelerating.
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This situation describes a skydiver who has reached terminal velocity, which is the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.
So, the skydiver is not under a dynamic condition (option B), is at terminal velocity (not option C), and is not increasing his/her velocity (not option D).
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