Epsilon(AS) | Physics | Momentum and Collisions | Lesson plan

# Schedule

Jan 11 -18 (1 week)

# Content

- Linear and angular monetum
- Law of conservation of momentum
- Elastic and inelastic collisions

# Instructional objectives

Students should be able to:

- state the principle of conservation of momentum (linear and angular)
- apply the principle of conservation of momentum to solve simple problems, including elastic and inelastic interactions between bodies in

both one and two dimensions

- recognise that, for a perfectly elastic collision, the relative speed of approach is equal to the relative speed of separation
- understand that, while momentum of a system is always conserved in interactions between bodies, some change in kinetic energy may take place
- Understand the term co-efficient of restitution and apply it

# Teaching Process

- Show that the law of conservation of momentum is a consequence of Newton's second law
- Understand that momentum is a clever way of working around forces during a collision
- Understand that momentum= impulse is a cause effect relationship p=f
_{Avg}*t and all variables are not equal. - Using observations of collisions between different masses and tallying observations with theoretical solutions
- working out different collision cases and seeing the importance of using law of conservation of energy.
- Simple references of similarity to angular momentum and its conservation are mentioned along the way

# Activities

- Studying collisions
- Newton's cradle
- Basketball + tennis ball bouncing demonstration and derivation

# Suggested reading / References

- Resnick and Halliday chapter 9
- slo-mo of a golf ballcollision to see the non-elastic energy losses into vibration[https://www.youtube.com/watch?v=00I2uXDxbaE]
- The basketball+tennis ball experiment and its relation to supernovae [https://www.youtube.com/watch?v=e-91PbbaKI8]
- Velocities after collision. Equations[http://en.wikipedia.org/wiki/Elastic_collision#One-dimensional_Newtonian]
- Experimentally determine co-efficient of restitution

# Assignments / Evaluation

- written test