PHET Collisions lab - Lab PDF

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Depar t mentofAppl i edPhysi cs LABORATORYEXPERI MENTS I N PHYSI CS ( 1)

Conser vat i onofLi near Moment um –ONLI NE

Name:…………………Ryan Klebe……................................................

ID: …………………………………………….................... .............................

Objectives: In this experiment you will study about the two types of collisions between two balls moving in one dimension in which the momentum is conserved while evaluating the kinetic energy of the two balls.

Apparatus: Two balls, frictionless surface and timers.

Procedure: Open this link: https://phet.colorado.edu/sims/html/collisionlab/latest/collision-lab_all.html

Go to Explore 1D tab Part 1 (Elastic collision) Steps:  Select elasticity 100% by dragging the blue triangle to the right. Select velocity and values

Keep masses m1 and m2 = 2.00 kg. Keep ‘position1’ 0.00 m and ‘position2’ 1.00 m. Keep speed v1 = 2.50 m/s and speed v2 = 0.00 m/s. Click on Play and once they collided click on Pause and read the values of v1f and v2f .  Complete Table i with the recorded values  Repeat the experiment using two different values of v1 and record the results in Table i.

   

Table i V1i

V2i

V1f

V2f

Pi =

Pf =

m1v1i

m2v2f

Pf/Pi

Ki = 0.5m1v1i

Kf = 2

Kf/Ki 2

0.5m 2v2f

(m/s) (m/s) (m/s) (m/s) (kg.m/s) (kg.m/s)

(J)

(J)

2.5

0

0

2.5

5

5

1

5

5

1

1

0

0

1

0.5

0.5

1

1

1

1

2

0

0

2

1

1

1

4

4

1

Part 2 (Inelastic collision) Steps:  Select elasticity 0% by dragging the blue triangle all the way to the left.

     

Choose m1 = 2.00 kg and m2 = 1.00 kg. Do not change the position values. Select v1 = 2.50 m/s and v2 = 0.00 m/s. Click on Play and once they collided click on Pause and read the value of vf. Complete Table j with recorded values Repeat the experiments using three different values of v1 and record results in Table j.

Table j V1i

V2i

Vf

Pi =

Pf =

m1v1i

Pf = (m1+m2)vf

Pf/Pi

Ki = 0.5m1v1i

Kf = 2

Kf/Ki

0.5(m1+m2) 2 vf

(m/s) (m/s) (m/s) (kg.m/s) (kg.m/s)

(J)

(J)

2.50

0

1.67

3.34

5.01

1.5

2.79

4.18

1.49

1

0

0.67

1.34

2.01

1.5

0.45

0.67

1.49

2

0

1.33

2.66

3.99

1.5

1.77

2.65

1.49

Questions and answers:

1) The difference of final kinetic energy and initial kinetic energy in elastic collision is always 0 a) True

b) False

2) During inelastic collisions which statement is true? a) b) c) d) e)

Linear momentum is conserved while kinetic energy is not conserved Both linear momentum and kinetic energy are not conserved Kinetic energy is conserved while momentum is not conserved. None of these Both linear momentum and kinetic energy are conserved

3) In inelastic collisions the ratio of final linear momentum and initial linear momentum is? a) b) c) d) e)

0.6 0 5 1 10

4) Conclusion: …………………………………………………………………………… ……………………………………………………………………………

…………………………………………………………………………… ……………………………………………………………………………...