BINA BANGSA SCHOOL
Department of Science A.Y.
2023 – 2024
Physics Junior College 1
Topic: Collision
1. Click the link below / Select the link to copy and paste in your browser to open collision
lab in phet simulator
https://phet.colorado.edu/sims/html/collision-lab/latest/collision-lab_all.html
The following page will be opened
2. Click on Explore 1 D to get the following page
3. Click on the more data check box to open more data next to mass as follows
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4. By default, the elasticity is kept 100%. If not, you keep the elasticity 100%
5. Complete the following table.
(Note: Calculate momentum of ball 1 and ball 2 separately and add them to find the total
momentum to fill in column 6 and likewise for kinetic energy in column 7.)
Tabulation 1:
Elastic Collision: 1 D
Before Collision
S.NO
Mass of
ball 1 (kg)
Mass of
ball 2 (kg)
Velocity of
ball 1 (m/s)
Velocity of
ball 2 (m/s)
1
0.5
0.5
0.25
- 0.25
2
1.0
1.0
0.25
0
3
0.5
1.5
0.50
- 0.50
4
1.5
0.5
1.0
- 0.50
5
1.0
3.0
0
-0.75
Total
momentum
of ball 1
and ball 2
(kgm/s)
Total
Kinetic
energy of
ball 1 and
ball 2 (J)
2
6. Now set the above-mentioned values in Tabulation 1, row by row in the simulator. Click
play button after every value (mass and velocity of ball 1 and ball 2) in each row is set.
Observe the collision. Press pause button after the collision.
7.
Fill in the velocities of ball 1 and ball 2 in the tabulation given after the below example.
(Note the velocities from the data section in the simulator.)
An example is shown below for setting the data and noting down the data:
Before collision
After collision
Values that you
set before
collision
Values that you
note down after
collision
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Tabulation 2:
Elastic Collision: 1 D
After Collision
S.NO
Mass of
ball 1 (kg)
Mass of
ball 2 (kg)
1
0.5
0.5
2
1.0
1.0
3
0.5
1.5
4
1.5
0.5
5
1.0
3.0
Velocity of
ball 1 (m/s)
Velocity of
ball 2 (m/s)
Total
momentum
of ball 1
and ball 2
(kgm/s)
Total
Kinetic
energy of
ball 1 and
ball 2 (J)
8. Calculate the total momentum and kinetic energy of the balls after collision.
(Note: Calculate momentum of ball 1 and ball 2 separately and add them to find the total
momentum to fill in column 6 and likewise for kinetic energy in column 7.)
9. Fill in the following blanks based on your inference from the above tabulations:
a. Total momentum before collision
collision.
total momentum after
b. What happens to the velocity when two identical masses, one at rest and the other moving
collide each other?
c. What happens to the velocities when two identical masses with equal velocities hit on each
other?
d. What happens to the velocities when two different masses with equal velocities collide on
each other?
e. Total kinetic energy before collision
after collision.
total kinetic energy
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10. Now, set the elasticity as 0%.
11. Set the values mentioned in Tabulation 1, row by row in the simulator. Click play button
after every value (mass and velocity of ball 1 and ball 2) in each row is set. Observe the
collision. Press pause button after the collision.
12. Fill in the velocities of ball 1 and ball 2 in the tabulation given below. (Note the velocities
from the data section in the simulator.)
Tabulation 3
Inelastic Collision: 1 D
S.NO
Mass of
ball 1 (kg)
Mass of
ball 2 (kg)
1
0.5
0.5
2
1.0
1.0
3
0.5
1.5
4
1.5
0.5
5
1.0
3.0
After Collision
Velocity of
ball 1 (m/s)
Velocity of
ball 2 (m/s)
Total
momentum
of ball 1
and ball 2
(kgm/s)
Total
Kinetic
energy of
ball 1 and
ball 2 (J)
5
13. Calculate the total momentum and kinetic energy of the balls after collision.
(Note: Calculate momentum of ball 1 and ball 2 separately and add them to find the total
momentum to fill in column 6 and likewise for kinetic energy in column 7.)
14. Answer the following questions based on your inferences by observing the calculated
values from Tabulation 1 and Tabulation 3:
a) Compare the total momentum of the balls before collision and after collision.
b) What is the kinetic energy you calculated in S.No 3 in Tabulation 1 ?
c) What is the kinetic energy calculated for the same scenario after collision in
Tabulation 3?
d) Why do you think your answer for (c) is different from your answer in (b)?
e) Total kinetic energy in inelastic collision is
.
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