Bounce Height: Light vs Heavy Ball

  • Context: Undergrad 
  • Thread starter Thread starter TheExibo
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Discussion Overview

The discussion revolves around the behavior of different types of balls when dropped from a height, specifically comparing light and heavy balls, as well as soft and hard balls. Participants explore concepts of impulse, momentum, and energy loss during bounces, with a focus on how these factors influence the height to which the balls rebound.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that dropping a light ball and a heavy ball from the same height would result in them bouncing back to the same height due to impulse being equal to the change in momentum.
  • Another participant encourages experimentation by dropping different balls to observe their bounce heights, questioning if they return to the same height when dropped from the same height onto the same surface.
  • Some participants argue that the type of ball (soft vs hard) may be more significant than weight, noting that a golf ball may bounce higher than a rubber ball due to energy absorption differences.
  • One participant posits that if balls are made from the same material, mass could affect bounce height, suggesting that more massive balls might deform upon impact, leading to energy loss and inelastic collisions.
  • Another participant mentions the behavior of Super Balls, noting their unique bouncing characteristics, including reversing spin, and shares personal experiences with them.

Areas of Agreement / Disagreement

Participants express differing views on whether mass or material type is more influential on bounce height, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

Some assumptions regarding material properties and collision types are not fully explored, and the discussion does not resolve the complexities of energy loss during impacts.

TheExibo
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Reading through my textbook, I came across a statement saying that dropping a ball onto the ground will result in the ground producing an impulse on the ball. Since impulse is the change in momentum, I figured that the momentum of the ball after the collision once it reaches the drop height is the same as before the drop. Would it be true that if you drop a light ball and a heavy ball at the same height, they would rise back up from the bounce to the exact same height?
 
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Would it be true that if you drop a light ball and a heavy ball at the same height, they would rise back up from the bounce to the exact same height?
Try it and see - drop a ball and see if it bounces back to the same height it started from.
Try two different balls - do they bounce back to the same height as each other if they are dropped from the same height onto the same surface?
 
I wouldn't say its a light ball vs a heavy ball but rather a soft ball vs a hard ball. I think a golf ball will bounce higher than a rubber ball. Some of the impact is absorbed by the rubber and converted to heat meaning the ball won't bounce as high.

http://en.m.wikipedia.org/wiki/Super_ball
 
jedishrfu said:
I wouldn't say its a light ball vs a heavy ball but rather a soft ball vs a hard ball. I think a golf ball will bounce higher than a rubber ball. Some of the impact is absorbed by the rubber and converted to heat meaning the ball won't bounce as high.

http://en.m.wikipedia.org/wiki/Super_ball

Assuming they were made out of the same material, does the mass affect how high it bounces back up?
 
TheExibo said:
Assuming they were made out of the same material, does the mass affect how high it bounces back up?
Yes, but for a practical rather than principled reason.

The more massive the ball, the more likely the impact will exceed its strength. It will deform (if not shatter). This means that you no longer have an elastic collision. Some energy will be lost in deforming the ball (and - for that matter- the ground).
 
jedishrfu said:
I wouldn't say its a light ball vs a heavy ball but rather a soft ball vs a hard ball. I think a golf ball will bounce higher than a rubber ball. Some of the impact is absorbed by the rubber and converted to heat meaning the ball won't bounce as high.

http://en.m.wikipedia.org/wiki/Super_ball
"A Super Ball is observed to reverse the direction of spin on each bounce"

Interesting, I've played with them many times as kid, but haven't observed this effect.
 
zoki85 said:
"A Super Ball is observed to reverse the direction of spin on each bounce"

Interesting, I've played with them many times as kid, but haven't observed this effect.
Oh totally. One of the fun things you can do is throw it forward with a huge backspin. It will hit the floor six feet in front of you and counter-intuitively come straight back toward you! It'll bounce again at your feet and take off forward again, arcing back and forth with each bounce.

You can pretend you're bouncing it to someone, and they get ready to catch it, but instead it comes straight back to you like paddle ball.
 

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