Holt Physics Chapter 6

• Elastic Collison- two pool balls
• Inelastic Collison- basket ball hits floor
• Perfectly Inelastic Collison- claydough balls collide

Two objects collide and return to their original shapes with no change in total kinetic energy

Two objects deform during the collision so that the total kinetic engergy decreases but the objects move seperately after collision

Two objects collide, stick together adn move as one mass with the same Velocity (V) after the collision. momentum is conserved.

Conservation of momentum works for a rocket as long as we consider the rocket and its fuel to be one system, and account for the mass loss (from fuel) of the rocket.

The total momentum of an isolated system of objects remains constant.

are neither elastic nor perfectly inelastic. They are just elastic. That is to say they are somewhere in between...

conserved in ALL COLLISIONS.

Kinetic Energy (KE) is conserved.

energy is NOT conserved.

vector force symbolized by the letter (p).

• equal to ΣF.
• (ΣF=Δp / Δt)

• FΔt = Δp OR FΔt = Δp = mV₁- mV₂
• EXAMPLES:
• - Follow Through
• - Increased contact when jumping
• -Air Bags

we can get the same change in momentum with a large force acting for a short time, or a small force acting for a longer time.

will use an AVERAGE FORCE.