Homework 3

Holt Homework 3 Elastic and Inelastic Collision
Read pg. 212-213
1. What did the inelastic collision demonstration show you?
2. Total momentum in a collision is usually _____________________,but total kinetic
energy is NOT _____________________ because some kinetic energy is
3. Perfectly inelastic collisions can be described when
4. Why are perfectly inelastic collisions easy to analyze in terms of momentum?
5. What is the equation for perfectly inelastic collisions?
6. Are directions of vectors important imperfectly inelastic collisions?
7. Read through Sample Problem E
8. Do practice problems E # 1,3 and 5:
9. During ________________ collisions some of the material is converted to other
forms of energy such as heat and sound and is not conserved.
10. You can use the formula for kinetic energy to calculate the decrease in total
kinetic energy during inelastic collisions. Look at sample problem F and
write that equation here:
11. Read the problem and write your knowns and unknowns here:
12. Show the equations used to figure out the change in Kinetic energy.
13. Do problems #1 and 3 in Practice F:
Elastic Collisions
14. In __________________ collisions two objects return to their original positions
with no loss of kinetic energy.
15. Most collisions are not elastic as most collisions have some loss of
__________________ _______________.
16. Any collision that produces sound is not ____________________.
17. most collisions are not elastic or ___________________ __________________ but fall
into something in between called ______________________.
18. Kinetic energy is ____________________ in elastic collisions.
19. A head-on collision is considered an ______________ collision.
20. In an elastic collision the momentum lost in the collision of one object is
_______________ by the second object.
21. Both kinetic energy and momentum are _________________ in an elastic collision.
22. Show the equation for momentum and energy being conserved in an elastic
23. Look at sample problem G and write your knowns and unknowns:
24. Diagram what is occurring in the problem:
25. What equation will you use?
26. Do problems #1 and 3 in practice G:
27. Make a table like table 2 on pg 220 to help you remember the three types of
ON the back do #1, #3 and # 5 of the Section Review on pg. 220 on the
back of this sheet.