1) The document discusses momentum and the principle of conservation of momentum, providing examples of calculations using this principle for different collision situations. 2) Students are instructed to work in groups to analyze situations and calculate unknown values by applying the principle of conservation of momentum to collisions and explosions. 3) Two example calculations are shown applying this principle to determine unknown velocities after collisions between objects with given masses and initial velocities.

1. 2.5 MOMENTUM

2. Students must be able to :-
Analyse and do calculation based
on the situation by applying the
Principle of Conservation of
Momentum in collision and
explosion.

3. PREVIOUS LESSON
▪ What is momentum?
▪ StateThe Principle of Conservation of
Momentum?
▪ Types of Collision
–Elastic Collision
–Inelastic Collision
–Explosion

4. GALLERY TOUR

5. INSTRUCTION
 1 group – 5 / 6 students (4 groups)
 Each group answer 1 QUESTION in 10
MINUTES
 After that, 2 students will stay, and others
group members will walk to another GROUP
and learn from them how to solve the
problem. Leave your COMMENT.
 Back at your own GALLERY and read the
comment from other group.

6. DISCUSSION & WRITE THE
ANSWER
(10 Minutes)

7. CLOCKWISE
- MOVE TO FIRST GROUP
(5 MINUTE)
- MOVE TO SECOND GROUP
(5 MINUTES)
- MOVE TO THIRD GROUP
(5 MINUTES)

8. FORMATIVE PRACTICE
m1 = 4kg, u1 = 8 m/s, v1 = 3 m/s
m2 = 5 kg, u2 = 5 m/s, v2 = ?
m1u1 + m2u2 = m1v1 + m2v2
(4)(8) + (5)(5) = (4)(3) + 5v2
v2 = 9 m/s
1.An object A of mass 4 kg
moves with velocity 8m/s
collides with an object B of
mass 5 kg with velocity 5 m/s
in the same direction. If the
velocity of A after collision is 3
m/s , find the velocity of B
after collision.

9. FORMATIVE PRACTICE
Figure 1 shows a bullet of 18 g
mass being fired from a pistol.
The bullet, travelling with a
velocity of 210 m/s , strikes a
wooden target of 0.45 kg mass
and is embedded in it.

10. Figure 1 shows a
bullet of 18 g mass
being fired from a
pistol.The bullet,
travelling with a
velocity of 210 m/s ,
strikes a wooden
target of 0.45 kg mass
and is embedded in it.
(a) What happens to the piston when the bullet is
fired? What is the principle involved?
(b)Before the bullet strikes the wooden block,
what is the momentum of the bullet?
(c)After the bullet is embedded in the wooden
target, what is the common velocity of the
bullet and the wooden block?
(d)What would be the acceleration of the bullet
in it enters the wooden block in 0.3 s?