Peoples Physics Concepts

8.6 Energy and Momentum Problems

8.6 Energy and Momentum Problems

• Solve problems involving both energy and momentum conservation.

Students will learn how to solve problems involving both energy and momentum conservation and where one is

allowed to use either momentum conservation or energy conservation or both.

Key Equations

∑Einitial=∑E

final ;T hetotalenergydoesnotchangeinclosedsystems

∑pinitial=∑p

final ;T hetotalmomentumdoesnotchangeinclosedsystems

Example 1

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/400

Watch this Explanation

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/1905

Explore More

1. You throw a 0.5 kg lump of clay with a speed of 5 m/s at a 15 kg bowling ball hanging from a vertical rope.
   The bowling ball swings up to a height of 0.01 m compared to its initial height. Was this an elastic collision?
   Justify your answer.