When jumping straight up from a crouched position, an average per...

Question

When jumping straight up from a crouched position, an average person can reach a maximum height of about 60 cm. During the jump, the person's body from the knees up typically rises a distance of around 50 cm. To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump. (b) Draw a free-body diagram of the person during the jump.

Accepted Answer

Hey everybody. So today we were given a problem. That's a little interesting. Were given a lot of values and we're being told that a gymnast jumps straight up straight up from the crowds position during a physical exercise, attaining a maximum height above the ground of approximately 60cm. However, the gymnast body above the knees rises approximately 52 cm above the ground. With all these calculations, We shall make an assumption that the whole body rises 60 cm during the jump. What free body diagram below will best represent the personal jumping. So these values are actually not important to us. What we need to determine is that during the jump the gymnast is in contact with the ground right while the person is jumping. So when the gymnast is in contact with the ground, let's just say this to the gymnast, she'll be applying a force downwards, right. Her weight will be going downwards, however, to keep her from sinking into the ground, there must also be a normal force that is perpendicular to the that is perpendicular to the weight force, normal force. So let's draw that as a free body, we have the weight force as well as the normal force. So looking at which one of our answer choices represents this, we can see that answer choice B is most closely resembling this. We have the weight and the normal force pointing upwards. I hope this helps. And I look forward to seeing you next time

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