Maximize Your Football's Flight in a Sports Hall: Physics Problem Help

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SUMMARY

The discussion focuses on calculating the maximum horizontal distance a football can travel in a 7.00 m high sports hall when kicked with an initial speed of 20.0 m/s. Key concepts include the decomposition of the initial velocity into horizontal and vertical components based on the angle θ, and the application of kinematic equations to determine the time of flight and horizontal distance. The gravitational acceleration is noted as g = 9.81 m/s², which affects the vertical motion of the ball. The goal is to find the optimal angle θ that maximizes horizontal distance while ensuring the ball remains below the ceiling height.

PREREQUISITES
  • Understanding of projectile motion and kinematics
  • Ability to decompose vectors into horizontal and vertical components
  • Familiarity with quadratic equations in physics
  • Knowledge of gravitational acceleration (g = 9.81 m/s²)
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  • Study the derivation of projectile motion equations
  • Learn how to apply kinematic equations to solve for time of flight
  • Research optimization techniques for maximizing projectile distance
  • Explore the effects of varying launch angles on projectile motion
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Students studying physics, particularly those focusing on mechanics and projectile motion, as well as educators seeking to enhance their teaching methods in these topics.

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I only have really started physics and I need help with this problem for homework.Any help is much appreciated!

A football is kicked from the
floor in a 7.00 m high
sports hall with an initial speed of 20.0 m/s. What is the maximum horizontal
distance it can
fly without touching the ceiling until it strikes the
floor?
 
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Have you drawn a a picture? Let [itex]\theta[/itex] be the angle the initial velocity vector makes with the floor. Do you know how to find the horizontal and vertical components of velocity in terms of [itex]\theta[/itex]? There is no acceleration horizontally, so horizontal velocity stays is constant. Do you know how to find the horizontal distance the ball will go in t seconds?

There is a downward acceleration, g= 9.81 meters per second per second. Do you know how to find the height of the ball after t seconds? You should have as quadratic equation for the height and that should be 0 when t= 0. Can you find the other value of t when the height is 0? (In other words, when the ball hits the ground, ending it flight.
That will depend on [itex]\theta[/itex].) The value of x for that t is the horizontal distance the ball flies- that will also depend on [itex]\theta[/itex].

You want to find the value of [itex]\theta[/itex] that maxizes that distance with the restriction that the height of the ball is always less than 7 meters.
 

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