Average Force Applied by Catcher

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Homework Help Overview

The discussion revolves around a physics problem involving a baseball's momentum change and the average force applied by a catcher's glove during a catch. The problem includes parameters such as the mass of the baseball, its initial speed, and the distance the glove moves upon impact.

Discussion Character

  • Exploratory, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants discuss calculating the time it takes for the glove to stop the ball, with some attempting to relate distance and speed to find this time. There are questions about the calculations and the need to use average speed rather than constant speed.

Discussion Status

The discussion includes various attempts to calculate the time and force, with some participants expressing confusion about their results. Guidance has been offered regarding the need to use proper units and the average speed concept. There is no explicit consensus on the correct approach yet.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the information they can use or the methods they can apply. There is an emphasis on ensuring calculations are done with the correct units.

Jtappan
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Homework Statement



0.15 kg baseball is pitched with a speed of 36 m/s (79.2 mph). When the ball hits the catcher's glove, the glove moves back by 4.9 cm (1.96 in.) as it stops the ball.
(a) What was the change in momentum of the baseball?
5.4 kg·m/s opposite the ball's direction of motion
(b) What impulse was applied to the baseball?
5.4 kg·m/s opposite the ball's direciton of motion
(c) Assuming a constant acceleration of the ball, what was the average force applied by the catcher's glove?
Magnitude _____ kN opposite the ball's direction of motion

Homework Equations



?

The Attempt at a Solution



i got everything except the magnitude of the force applied by the glove... i don't know how to do this when i have to relate distance to this problem.
 
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Use the distance and speed to figure out how much time it took for the catcher to stop the ball.
 
i keep doing this problem and it does not work out. I don't know what I am doing wrong. for the time i get .13637.
 
That's quite a bit off. Show how you did the calculation. Also realize that the speed is not constant during the catch--you'll need to use the average speed.
 
ok i did it again and got .2722222 s for the time. just did xf-xi = .5(vf+vi)t
 
Don't forget to use distance in meters, not cm.
 
.002722222 is the time??

giving force as .00001469988?
 
Jtappan said:
.002722222 is the time??
Good.

giving force as .00001469988?
No. How did you get that?
 
f(deltaT) = mv-mvi

did i plug it in wrong?
 
  • #10
never mind i got it thank you for your help
 

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