Energy, Grabity and Calculating Net Force of a Diver

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SUMMARY

The discussion focuses on calculating the average net force acting on a diver after entering the water. The diver has a mass of 60.0 kg and an initial speed of 6.50 m/s, which reduces to 1.10 m/s after 1.75 seconds. Using the formula F=ma, where 'a' is the calculated deceleration, participants confirm that the net force can be determined by first calculating the deceleration and then applying it to the diver's mass. The key takeaway is that the net force acting on the diver can be accurately calculated using the provided values and equations.

PREREQUISITES
  • Understanding of Newton's Second Law (F=ma)
  • Basic knowledge of kinematics equations
  • Familiarity with calculating speed and acceleration
  • Concept of gravitational force (9.8 m/s²)
NEXT STEPS
  • Calculate deceleration using the formula a = (final velocity - initial velocity) / time
  • Apply the calculated acceleration to determine the net force using F=ma
  • Explore the effects of buoyancy on a diver's motion in water
  • Review real-world applications of net force calculations in sports physics
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and forces, as well as educators looking for practical examples of force calculations in real-life scenarios.

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Homework Statement


A 60.0-kg person, standing on a diving board, dives straight down into the water. Just before striking the water, her speed is 6.50 m/s. At a time of 1.75 s after entering the water, her speed is reduced to 1.10 m/s. What is the average net force (magnitude and direction) that acts on her when she is in the water?

Homework Equations


F=ma
Kinematics Equations
V=d/t

The Attempt at a Solution


I multiplied the mass times gravity (9.8) and get the downward force. I used 6.5 as the initial velocity and 1.1 as final velocity. Then deacceleration can be calculated. But i don't know where to go from here.
 
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You know the acceleration as she goes through the water and you know her mass. Can you find the net force acting on her from this information?
 

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