4
   

acceleration

 
 
Reply Fri 2 Aug, 2013 05:05 am
I am realy confusing about"when we throw a ball into the air. it stops at the top.We say at that point the acceleration is maximum.but how can it possible that ball is stationary and the rate of cange of velocity is acceleration.
  • Topic Stats
  • Top Replies
  • Link to this Topic
Type: Question • Score: 4 • Views: 820 • Replies: 3
No top replies

 
BillRM
 
  1  
Reply Fri 2 Aug, 2013 06:03 am
@phsicsboy,
.
Quote:
We say at that point the acceleration is maximum.


Sorry, no one that I know of say any such thing, the ball potential energy is at max however and the kinetic energy is zero.

The acceleration after it leaved your hand is constant at roughly 9.9 meters/sec or 32 ft/sec.

footnote assuming a straight in the air launch and disregarding air resistance.
0 Replies
 
raprap
 
  1  
Reply Fri 2 Aug, 2013 09:17 am
@phsicsboy,
In Newtonian physics--the acceleration (on Earth) is constant--32 ft/s^6, 9.8 m/s^2

What changes when you throw a ball in the air is velocity, the velocity is zero when it reaches the top of the arc--not the acceleration.

Rap
0 Replies
 
tomr
 
  1  
Reply Fri 2 Aug, 2013 12:39 pm
@phsicsboy,
The ball has no vertical component of velocity at the peak of its trajectory. Gravity is always pulling down at a constant rate as raprap said. So the acceleration does not change in time.

In math, especially calculus, the maximum and minimum values are the highest and lowest points on a graph respectively. The graph in the x-y plane of a ball thrown is always a parabola (unless thrown straight up). If you graph the velocity of the ball as it changes in time, you will a straight line (v =v0 + at). So the velocity has no maximum value because it has no peak. It is the vertical height that is at a maximum. And the acceleration is always constant (-9.81 m/s^2 or -32.2 ft/s^2). So if you graphed the acceleration with time you will get a straight line.
0 Replies
 
 

Related Topics

New Propulsion, the "EM Drive" - Question by TomTomBinks
The Science Thread - Discussion by Wilso
Why do people deny evolution? - Question by JimmyJ
Are we alone in the universe? - Discussion by Jpsy
Fake Science Journals - Discussion by rosborne979
Controvertial "Proof" of Multiverse! - Discussion by littlek
 
  1. Forums
  2. » acceleration
Copyright © 2022 MadLab, LLC :: Terms of Service :: Privacy Policy :: Page generated in 0.03 seconds on 01/20/2022 at 11:38:40