High Jumper Acceleration Calculation

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Homework Help Overview

The discussion revolves around calculating the horizontal and vertical acceleration of a high jumper during takeoff, given the ground reaction force (GRF) and the jumper's weight. The subject area includes dynamics and forces in physics.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the need to calculate the net force in both horizontal and vertical components. There is uncertainty about how to apply Newton's second law after determining the net force. Questions arise regarding the definition of GRF and the direction of forces involved.

Discussion Status

Some participants have provided guidance on calculating net forces and suggested using trigonometry to resolve components. However, there is still confusion regarding the application of these concepts, and multiple interpretations of the problem are being explored.

Contextual Notes

Participants express varying levels of confidence in their understanding of physics concepts, indicating that some may be struggling with foundational knowledge. There is an acknowledgment of the complexity of the problem, particularly in breaking down the forces involved.

vickic
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Hi, I am really stuck on this question, any help would be really really helpful!

During takeoff a 76kg high jumper experiences a GRF of 1750N acting at an angle of 70 degrees to the horizontal. Taking acceleration due to gravity to be 9.81 ms and ignoring air resistance, calculate the HORIZONTAL and VERTICAL acceleration experienced by the jumper at this point in time.

I think i need to work out the net force first, but after this I am completely confused. Thanks :frown:
 
Physics news on Phys.org
1. calc net force in x- and y composants

2. Net force = mass * acceleration, Newtons famous law.
 
i understand the equation and got the net force to be 745.6 ? but i dnt understand how to fo it for x (horizontal) and Y (vertical). I know this probs sounds daft but physics really isn't my strong point! Thanku
 
in what direction?...

and what is GRF ?
 
and yeah, use trigonometry.
 

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