Kicking a Soccer Ball: Distance & Force Needed

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Discussion Overview

The discussion revolves around the physics of kicking a soccer ball, specifically focusing on the force and velocity required to achieve various distances (20, 30, and 40 feet) with a ball weighing 290 grams. Participants explore the necessary angles for optimal kicking and the implications of different assumptions in the calculations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the force and velocity needed to kick a soccer ball to specific distances and requests formulas for the angles required.
  • Another participant suggests using the formula F = ma and standard constant acceleration equations, encouraging the original poster to show their calculations.
  • A participant questions the angle of the kick, proposing that a 45-degree angle minimizes force when the ball is on the ground, but this may change if the ball is already in the air.
  • Concerns are raised about the nature of the inquiry, with one participant suggesting that the question resembles a homework assignment and encouraging the original poster to conduct preliminary research.
  • The original poster clarifies that they are building a robot for a robotics competition and need the information to design a pneumatic launching device.
  • Another participant mentions using kinematic equations to determine flight time and launch angles, and discusses the conservation of momentum in relation to the pneumatic piston design, noting that energy loss must be considered.

Areas of Agreement / Disagreement

Participants express differing views on the assumptions involved in the calculations, particularly regarding the idealization of the scenario and the angle of launch. There is no consensus on the specific parameters or methods to be used in the calculations.

Contextual Notes

Participants highlight the importance of defining assumptions, such as whether the force applied is constant and the conditions under which the ball is kicked. The discussion also touches on the idealized nature of the physics involved versus real-world applications.

Who May Find This Useful

This discussion may be useful for individuals interested in the physics of projectile motion, robotics design, and the application of kinematic equations in practical scenarios.

JohntheGreat
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How much Force and at what velocity it would take to kick a soccer ball that weights 290 grams or .64 lbs in an arc for a distance of 20 feet, 30 feet, and 40 feet?

-Can you include the formulas for what the angle would need to be to kick the ball those three distances too.
 
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Welcome to PF!

Hi JohntheGreat! Welcome to PF! :wink:

Use F = ma and the standard constant acceleration equations.

Show us what you get. :smile:
 
I would appreciate a little more help thank you
 
What angle did you have in mind, or were you going to minimize force? In that case, the angle would be 45 degrees as the ball is on the ground. It will be something less if it is in the air.
What is the distance or time duration of the applied force?
Is the force constant for the time of application?
Is the force constant between applications? Sounds like it, but the fewer things assumed, the happier we are with the results.
 
We aren't here to do your homework John (and this look ultra suspiciously like a research assignment). Tell us what you think.

Also is this a highy idealised case, or a real case you are considering? As the common answer of 45 degrees doesn't hold true for a real case.

I'd suggest you do a cursory sweep of google before coming back, there are some very good sites on football trajectories and general principles behind the kicking of a spherical ball. Think about what assumptions are being made too.
 
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I am building a robot my FIRST Robotics team here is a link to the competition this year I have not taken Physics yet and any help or guidance would be very appreciative. Also I am trying to design a Pneumatic launching device and to do this I need the answers to this questions to order the correct pneumatic piston.
 
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Ah I see. Using the kinematic equations you can find the flight time for a ball with a set launch velocity.
http://www.physicsclassroom.com/class/1DKin/u1l6a.cfm

From this you can also work out the angle needed for a set launch speed. To get the required lauch speed depends on the launching mechnicam.

As you mention a pneumatic piston you can simply use convervation of momentum.
http://en.wikipedia.org/wiki/Momentum#Conservation_of_linear_momentum

You will have to factor in the loss due to the coefficient of restitution of the ball to piston contact (ie some energy will be lost).
http://en.wikipedia.org/wiki/Coefficient_of_restitution

You can then work out the amount of air pressur eneeded to accelerate the piston to the required speed in the space available from F=Ma
 

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