Download Time:30 minutes

Lesson plan
Time
Topic
Objectives
Content Item
A. Introduction to
momentum
: 80 minutes
: Momentum
: 1. Understand the concepts on momentum
Apparatus
Teaching Activities
1. Discuss the case of a car accident
Remarks
Timing
Point out the relationship among Impact force, mass 10 mins
and speed
Introduce the concept of momentum
B. Conservation
of momentum
in collisions
1. Discuss the experience in skating
2. Calculate the momentum on a
billiard ball
3. Calculate the momentum on two
colliding football players
Introduce the principle of conservation of
momentum
Distinguish between elastic collision and inelastic
collision
20 mins
C. Conservation
of momentum
in explosions
and recoils
1. Discuss the case of firing a gun
2. Calculate the recoil velocity of a
gun
Apply the principle of conservation of momentum
on a gun when it fires
Point out the relationship between the mass and
recoil velocity of a gun
20 mins
D. Impulse and
change in
momentum
1. Discuss the case of hitting a tennis
ball with a racket
2. Calculate the force acting on a
tennis with different impact time
3. Movie clip: Crumple zones of a car
4. Movie clip: Seat-belt
5. Movie clip: Air bag
6. Flash animation showing how
seat-belt can protect a passenger
Introduce the concept of impulse
30 mins
Point out the relationship between force and impact
time.
Introduce the safety features in a car
1