Is the ball's speed increasing?

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Homework Help Overview

The discussion revolves around the motion of a ball, specifically examining whether its speed is increasing, decreasing, or remaining constant based on the relationship between momentum and net force acting on it.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to determine the speed of the ball based on the direction of force and momentum. Some participants question the implications of the angle between the force and momentum vectors on the ball's speed.

Discussion Status

Participants are exploring the relationship between force and momentum, with some guidance provided regarding the need to consider vector directions. There is an ongoing examination of different scenarios, such as the effect of changing the direction of the force.

Contextual Notes

There is a lack of formal equations provided, and assumptions about the directionality of forces and momentum are being discussed. The implications of these assumptions on the ball's speed are not fully resolved.

Westin
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Homework Statement



The figure below shows a moving ball, its momentum, and the net force acting on it an instant in time.

At this instant, the ball's speed is:

1) not changing [/B]
2) decreasing
3) increasing

Homework Equations



None.

The Attempt at a Solution



My guess would be that the balls speed is increasing since the force and change of momentum both go towards + x direction but I'm not totally sure, any help?[/B]
 

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Correct, but you could formalise your answer a bit. It is possible that the momentum and force both have positive components in the x direction and have decreasing speed. The real issue is about the angle between the force and momentum vectors.
 
Orodruin said:
Correct, but you could formalise your answer a bit. It is possible that the momentum and force both have positive components in the x direction and have decreasing speed. The real issue is about the angle between the force and momentum vectors.

That makes sense, if the force was pointed straight down instead, would the ball's speed then be slowing down?
 
Last edited:
Westin said:
That makes sense, if the force was pointed straight down instead, would the ball's speed then be slowing down?
Given the same momentum, yes.
 

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