What impulse was delivered to the ball by the player?

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Homework Help Overview

The problem involves calculating the impulse delivered to a soccer ball by a player, focusing on the change in momentum as the ball is struck and changes direction. The subject area pertains to dynamics and momentum in physics.

Discussion Character

  • Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the formula for impulse as the change in momentum and explore the correct application of vector signs in the calculations. There are attempts to clarify the direction of velocities and how they affect the impulse calculation.

Discussion Status

Some participants have provided calculations and expressed confusion regarding the signs of the velocities involved. There is an indication that one participant believes they have resolved their confusion, but no consensus has been reached on the correct impulse value.

Contextual Notes

Participants are navigating the vector nature of the problem, which includes the need to consider direction when calculating momentum changes. There is also a mention of potential errors in earlier calculations.

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Homework Statement



A 0.47 kg soccer ball approaches a player horizontally with a velocity of 18 m/s to the north. The player strikes the ball and causes it to move in the opposite direction with a velocity of 24 m/s.

What impulse was delivered to the ball by the player? Answer in kg*m/s


Homework Equations



impulse = change in momentum
momentum = mv


The Attempt at a Solution



0.47((24-(-18)) = 19.74 kg*m/s

or would it be

0.47(24-18) = 2.82 kg*m/s

i'm lost
 
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The change in momentum will be

[tex]mv_1-mv_2 = m(v_1-v_2)[/tex]

Now keep in mind these are vectors. So one will be a negative number...

[tex].47 kg (18 - (-24) \frac{m}{s})[/tex]
 
Bill Foster said:
The change in momentum will be

[tex]mv_1-mv_2 = m(v_1-v_2)[/tex]

Now keep in mind these are vectors. So one will be a negative number...

[tex].47 kg (18 - (-24) \frac{m}{s})[/tex]
oops i meant - 2.82, it says it wrong
 
Nevermind I got it

0.47(-24-18) = -19.74 that's the answer
 

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