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PHYSIC MODUL

FORM 4

Learning Area Forces and Motion

Learning Objective Analysing Momentum

Learning Outcome A student is able to(i) state the Principle of Conservation of Momentum

(ii)describe applications of conservation of momentum

Pre requiite Student should know that momentum is the product of mass andvelocity

Duration  ! minutes

Materia! Reource Materia! Reource

(i) "Pintar# $irtual %ab ( C& 'M)

(ii) e*t +ook 

(iii) http,--www.ppsa.com-ppsa-science-mechanic-airtrack.htm .

 

http,ww.glenbrook.k/0.il.us-gbssci-phy-mmedia-momentum-creti.html

"ob!e #a!ue +eing honest and accurate in recording and validating data

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$%ACHI"& A"D L%AR"I"& AC$I#I$I%S

Learning

Outcome

$eac'er Activitie Stu(ent Activitie

%"&A&%M%"$

eacher divides student into small

group (suggestion , 1student-group)

A!ternative , eacher

demonstrates collision using linear

air track e2uipment

3ach group is given two similar type of marbles. hey

are re2uired to put one marble on the desk and they areinstructed to strike the marble with another one.

Students are asked to discuss their observations andgive a possible e*planations.

Student is able tostate the principle

of conservation of

momentum

%)PLORA$IO"

eacher asks student whether

e*ternal forces are involved in that

e*periment.

Students are given worksheets of the e*periment toinvestigate whether momentum is conserved in elastic

and inelastic collisions. ('efer Appendi* A ).4alf the

students will investigate case / and the rest case 0

Ask them whether the total momentum before the

collision is the same as the total momentum after thecollision.

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%)PLA"A$IO"

/. eacher asks each group of student to e*plain

their findings.

0. eacher e*plains the principle of conservationof momentum

5. eacher should emphasi6e that theconservation of momentum is only true for a

closed system.( no e*ternal forces )

1 eacher tells students situations wheremomentum is conserved.

3*ample , Collision between molecules in a gas7

collision between billiard balls.

A student is able todescribe

applications of conservation of 

momentum

%)$%"SIO"

eacher will ask,

/. 8f you push continuously one of the trolleysduring your e*periment7 will the principle of 

conservation of momentum still apply.

9ive another e*amples pertaining to

applications of conservation of momentum

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CO"CLUSIO"

Student re2uired to state the Principle ofConservation of Momentum

#ocabu!ar*

Principle of Conservation of Momentum < Prinsip =eabadian Momentum

3lastic collision < Perlanggaran kenyal

8nelastic collision> Perlanggaran ak =enyal

3*ternal Forces < &aya luar 

Closed system < Sistem tertutup

Collision < Perlanggaran

$elocity < 4ala?u

Speed > %a?u

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A++en(i, A

Cae -

;hen two ob?ects collide7 both will move together after collision.

4ypothesis , State your hypothesis regarding the conservation of momentum in collision for case /.

/. @se the apparatus shown in figure . Choose trolleys that have the same mass. Stick some plasticine on trolley A and trolley+ so that both trolleys will stick and move together after collision.

0. 'eadings that you should record to calculate momentum before and after collision include,i) mass of trolley A and trolley +

ii) velocity of trolley A before collisioniii) velocity of trolley A and trolley + after collision

+oth these velocities can be obtained from the ticker tape.

5. Calculatei) total momentum before collision.

ii) total momentum after collision.iii) total kinetic energy before collision.

iv) total kinetic energy after collision.

1. 'epeat the e*periment usingi) two trolleys colliding with one trolley.

ii) hree trolleys colliding with one trolley.B. Conclusion weather your hypothesis is accepted or re?ected.

. Prepare a full written report.

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Cae .

;hen two ob?ects are colliding with each other7 both ob?ects will move with different velocity after collision.

4ypothesis, State your hypothesis regarding with the conservation of momentum in collision case 0.

/. 'epeat the e*periment withi) plasticine removed from the trolley.

ii) Springed rod removed from trolley A.

iii) icker tape on each trolley.0. 'ecord your reading in the table.

Make a conclusion regarding with the conservation of momentum in the collision case 0.5. Prepare a full written report.