Question

HELP IM TAKING MY EXAM !!!!

Luz, who is skydiving, is traveling at terminal velocity with her body parallel to the ground. She then changes her body position to feet first toward the ground. What happens to her motion?
She will continue to fall at the same terminal velocity because gravity has not changed.
She will slow down because the air resistance will increase and be greater than gravity.
She will speed up because air resistance will decrease and be less than gravity.
She will begin to fall in free fall because she will have no air resistance acting on her.

Answer 1

Answer:

c. She will speed up because air resistance will decrease and be less than gravity.

Explanation:

Answer 2

She will speed up because air resistance will decrease and be less than gravity.

• Luz is skydiving with terminal velocity and her body is parallel to the ground.

• At this point, she will be experiencing a gravitational force acting downwards, and also air resistance as a result of the drag force on her body
• Since the downward gravitational force on Luz is constant, she will fall with a net force of;
• F_net = F_g – F_d

where;

F_net is the net force on Luz acting downwards

F_g is the gravitational force on Luz

F_d is the drag force on Luz

The drag force on her body is proportional to the surface area of attack.

Now Luz changes her body position to feet first toward the ground. This means that the surface area of attack is reduced because the feet will consume less space than the frontal part of her body.

Now, from earlier, we saw that;

F_net = F_g – F_d

So, the lesser F_d is, the higher F_net becomes.

Thus, she will speed up because air resistance has reduced and been less than gravity.

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