Collisions: Ball with initial velocity is kicked, force of kick?

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Homework Help Overview

The discussion revolves around a physics problem involving a ball that is kicked, transitioning from an initial velocity to a final velocity at an angle. The participants are exploring the concepts of momentum and impulse in the context of collisions.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss whether the scenario represents an inelastic collision and explore the application of momentum conservation. There is also a consideration of impulse and the need for time during which the kick was applied.

Discussion Status

Some participants have offered clarifications regarding the definitions of impulse and momentum, while others are questioning the variables needed for the calculations. The conversation is ongoing, with no clear consensus yet on the approach to take.

Contextual Notes

There is a mention of missing information, specifically the time duration of the kick, which is crucial for solving the problem. Participants are also reflecting on their understanding of the relevant equations.

Merlinnair
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Homework Statement


A 10 g ball going at a speed of 5 m/s is kicked, and flies off at an angle of 35° at 25 m/s. What was the force of kick?
Known:
m = 0.0010 kg
vi = 5 m/s
θ = 35°
vf = 25 m/s

Homework Equations


mvi = mvf
F = ma

The Attempt at a Solution


Would this count as an inelastic collision?
In the x direction:
.0010g(5m/s) + m(0m/s) = (.0010 kg + m)(25cos35)

After that, I'm really not sure how to get to the acceleration...
 
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This is an impulse-momentum problem, not a momentum conservation problem. (You'll need the time during which the kick was applied.)
 
In that case, I might have forgotten a variable, as I don't have the question with me. So if I had the time...

Impulse is F/t and change in momentum right?

So then, all I'd have to do is set F/t = p_i - p_f?
 
Merlinnair said:
Impulse is F/t and change in momentum right?
Almost. Impulse is F*t, not F/t.
So then, all I'd have to do is set F/t = p_i - p_f?
Set impulse = Δp. (FYI: Change in something is always final - initial.)
 
Oh, right, typo on the change in part, and I really do need to start memorizing my equations. Thanks for your help!
 

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