Created by prof Hwang Modified by Ahmed

Original project [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1126.0]Impact force[/url]

Two objects with m1 and m2 respectively, released from the same height [b]h[/b] to the ground.

Under the condition: mass m2=2*m1

The time for object to reach the ground are T1 and T2 respectively,

Normally, the air reststance can be ignored for heavy objects, and we know that

T2=T1=, where g is the gravity.

If the impact forces are F1 and F2 respectively.

What is the relation between F1 and F2?

A. F2>2*F1

B. F2=2*F1

C. F2<2*F1

The impact force F=?P/?T, where ?P is the momentum change during the impact and ?T is the impact time.

Both object drop from the same height, so the velocity when impact start is ,

So ?P2=2*?P1.

We need to know the relation between ?T2, ?T1 in order to compare F2/F1.

If ?T2= ?T1, then F2=2*F1.

However, is it true that ?T2= ?T1 ???

If ?T2> ?T1 , how to find out relation between F1 and F2?

You can check out the answer with the following simulation:

The impact time ?T and Faverege will be shown. F(t) is available, too!

The impact force is modeled with. /htdocs/ntnujava/ejsuser/37048/users/br/ahmed/fallingobjectforce_pkg/fallingobjectforce.propertiesFull screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list

Download EJS jar file(1463.2kB):double click downloaded file to run it. (49 times by 14 users) , Download EJS source (3 times by 3 users) View EJS source