Question about projectile motion

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Discussion Overview

The discussion centers around questions related to projectile motion, specifically focusing on vertical acceleration due to gravity and the equations used to determine initial velocity, angle, and maximum height. The scope includes conceptual understanding and mathematical reasoning related to projectile motion in a physics context.

Discussion Character

  • Conceptual clarification
  • Mathematical reasoning

Main Points Raised

  • Some participants assert that the vertical acceleration of an object in projectile motion is equal to 9.81 m/s², assuming no air resistance and that the object is near the Earth's surface.
  • One participant emphasizes the importance of considering the direction of acceleration, noting that it acts downward.
  • Another participant provides equations for calculating initial velocity, maximum height, and angles in projectile motion, suggesting specific formulas for each aspect, including the use of trigonometric functions.

Areas of Agreement / Disagreement

Participants generally agree on the value of vertical acceleration due to gravity in ideal conditions, but the discussion about the equations for initial velocity, angle, and maximum height presents varying approaches without consensus on the best method.

Contextual Notes

Some equations provided may depend on specific assumptions about the initial conditions and the context of the projectile motion problem, such as the starting height and the time of flight.

soul5
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I have a question when any object is in project motion is the vertical acceleration of the object equal to 9.81m/s^2 (gravity)?
 
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Yes - (ignoring air resistance) remember to get the signs right, it acts down!
 
Yes. (Given the usual assumptions: Near the Earth's surface; no air resistance.)
 
Doc Al said:
Yes. (Given the usual assumptions: Near the Earth's surface; no air resistance.)

I have another question what equations can I use to find intial v, the angle and maximum height on projectile motion?
 
I have another question what equations can I use to find intial v, the angle and maximum height on projectile motion?

For initial V you only need:

initial V = (X - initial X) / t


For maximum height (you are asking for final y, where initial y=0, and initial V=0) :

y = (4.9m/s^2) (t^2)


Finally, angles are found using Pythagoras theorem or sen, cos, and tan famous equations. Review your trigonometry.
 
Last edited:

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