Physics 207 WebPages - Fall 1999

Jieun Hwang, Lisa Boyette, Jason Steslace, Adam Gray, Matthew Barnes

{Download PowerPoint Presentation (3.2MB)}

• If two bodies are exerting STRONG forces on each other over a short period of time, then you have a collision problem.
• Linear Momentum is ALWAYS conserved.
• Kinetic Energy is NOT always conserved.

• Kinetic Energy is conserved during an elastic collision.
• Kinetic Energy is not necessarily conserved during an inelastic collision.

• Impulse-Linear Momentum Theorem

• Relates strength and duration of collision force to change in momentum
• Similar to Work-Kinetic Energy Theorem

• D p = p_f - p_i = J (10-4)
• J = F D t (10-8)
• (10-10)

• (10-18)
• (10-19)
• (10-28)

• (10-29)

• (10-34)

• (10-36)

• (10-30)

• Impulse and Linear Momentum

• Series of Collisions

• Elastic Collision

• 1-D
• 2-D

• Inelastic Collision

• 1-D
• 2-D

• Use Conservation of Momentum
• Impulse-Linear Momentum Theorem

• Series of Collisions

• Use Equation (10-10)

• Inelastic Collisions

• Use Conservation of Momentum
• NO CONSERVATION OF KINETIC ENERGY
• In Completely (Totally) Inelastic Collisions, Masses Stick Together

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