Football punt kinetc energy

  • Thread starter amandamolegir
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In summary, the kinetic energy of a punted football is greatest at its highest point, while its potential energy is greatest when the ball is at its maximum height. The mechanical energy is also at its greatest at the highest point. When the return man catches the ball, the kinetic energy that the ball had is transferred to the return man. To find the potential energy of an object at any height, the formula used is PE = m*g*h. To determine the location of the ball at its maximum kinetic energy, one must understand the relationship between kinetic and potential energy and utilize information on projectile motion.
  • #1

Homework Statement


A football is punted downfield (neglect the resistance of the air.)
a.) Where in the path of the punted ball is the kinetic energy the greatest?
b.) where in the path of the punted ball is teh potential energy teh greatest?
c. Where in the path of the punted ball is the mechanical energy the greatest?
d.) When the return man catches the ball what happens to the kinetc energy that the ball had?



Homework Equations


none that i know of


The Attempt at a Solution


a.) is it at the top when its thrown
b. is it when its about to be kicked?
c. i don't know this one
d. is this there is no kinetic energy?
 
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  • #2
What is the potential energy formula for an object at any height?
 
  • #3
i don't know.. I don't think i ever learned that...
 
  • #4
amandamolegir said:
i don't know.. I don't think i ever learned that...

OK. Well time to learn that then

PE = m*g*h

So at what h in the flight of the ball is PE at its max?
 
  • #6
amandamolegir said:
at the highest point?

yes.

Now to get #1 think about how PE and KE are related. When KE is at a min, where is the PE? When KE is at a max, where is the PE?
 
  • #7
when KE is at a minuimum, there isn't much motion...So teh potential energy would be greater...
So when Ke is at a max, PE would be lower
 
  • #8
amandamolegir said:
when KE is at a minuimum, there isn't much motion...So teh potential energy would be greater...
So when Ke is at a max, PE would be lower

youre certainly on the right track here.

So you found that PE is greatest when the ball is at its maximum height. So when do you think its KE would be highest keeping in mind what you just concluded?
 
  • #9
also at its highest point
 
  • #10
amandamolegir said:
also at its highest point

How could that be so? You determined this already:

"So when Ke is at a max, PE would be lower"

So how can the KE in this situation be at a max when PE is at a max?

If I were you, before you go any further look up some information on projectile motion.

http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Vectors/ProjectilesMotion.html [Broken]

Here is a very basic set of equations and a diagram. Dont limit your search to this, do some of your own research on projectile motion
 
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1. What is "Football punt kinetic energy"?

Football punt kinetic energy refers to the energy generated when a player kicks or punts the football. It is the energy that is transferred from the player's leg to the football, causing it to move forward.

2. How is "Football punt kinetic energy" calculated?

The formula for calculating football punt kinetic energy is KE = 1/2mv^2, where KE is kinetic energy, m is the mass of the football, and v is the velocity of the football.

3. Why is "Football punt kinetic energy" important in the game of football?

Football punt kinetic energy is important because it determines how far and how fast the football will travel. It also affects the trajectory of the ball, which can impact the outcome of the game.

4. Can "Football punt kinetic energy" be increased?

Yes, football punt kinetic energy can be increased by increasing the mass or velocity of the football. This can be achieved through proper training and technique.

5. How does air resistance affect "Football punt kinetic energy"?

Air resistance, or drag, can decrease the speed and distance of a kicked football, thus reducing its kinetic energy. This is why punters often try to kick the ball with a spiral motion, which reduces air resistance and allows the ball to travel farther.

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