Impact Force Problem

  • #1
When dropping a metal ball onto a foam mat what is the formula for the impact speed. I know the impact speed, rebound speed, the mass of the ball and time of the ball on the mat.



I know:

F = m[delta]v
.......[delta]t

and

F = mg , where g= -9.8 N/kg


But what is the impact force?

Is it F = m[delta]v + mg ?
.............[delta]t
 

Answers and Replies

  • #2
7
0
Force

[tex] F = \frac{d\rho}{dt} [/tex]

:rolleyes:

(Does my LaTeX work?)
 
  • #3
ok, but still I don't understand whether the weight force affects the value of the impact force.

The ball is being dropped vertically, so do we add the weight force to dp/dt?
 
  • #4
PhanthomJay
Science Advisor
Homework Helper
Gold Member
7,165
507
ok, but still I don't understand whether the weight force affects the value of the impact force.

The ball is being dropped vertically, so do we add the weight force to dp/dt?
When you calculate the momentum change over time, you are calculating the NET force acting on the object, per Newton's 2nd law. The net force is a combination of the gravity force downward and the normal force upward. So, what does that tell you about the 'impact' (normal) force?
 

Related Threads on Impact Force Problem

Replies
7
Views
2K
  • Last Post
Replies
2
Views
5K
  • Last Post
Replies
4
Views
9K
  • Last Post
Replies
1
Views
5K
  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
10
Views
2K
  • Last Post
2
Replies
38
Views
1K
  • Last Post
Replies
1
Views
7K
Top