Air resistance vs. free fall

  • Thread starter itsme1
  • Start date
  • #1
1
0
if we throw upward a ball with speed x. What can we say about it when the ball returns in the presence of air resistance? What about in the absence?
 

Answers and Replies

  • #2
Nugatory
Mentor
13,241
6,120
if we throw upward a ball with speed x. What can we say about it when the ball returns in the presence of air resistance? What about in the absence?
In the absence of air resistance, it's easy - the ball comes back down at the same speed that it went up with. This follows from conservation of energy; the ball started with a certain amount of kinetic energy, traded the kinetic energy for potential energy as it climbed, and then reversed the trade and regained the kinetic energy on the way down.

In the presence of air resistance, the ball will come down at a slower speed and with less kinetic energy than it started with. The missing energy will have gone into friction with the air heating the ball and the air around it; the exact amount of energy lost will depend on many variables (the texture of the surface of the ball, the temperature and humidity, ....) and is generally hard to calculate.
 
  • #3
1,948
200
That sounds like homework
 

Related Threads on Air resistance vs. free fall

  • Last Post
Replies
3
Views
4K
Replies
6
Views
1K
  • Last Post
Replies
3
Views
3K
  • Last Post
Replies
16
Views
3K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
7
Views
3K
Replies
7
Views
8K
  • Last Post
Replies
5
Views
757
  • Last Post
Replies
10
Views
2K
  • Last Post
Replies
2
Views
2K
Top