Chapter 5 Review

Mason Kehoe


Conservation- The act of conserving something; Nothing is lost.

Elastic/Inelastic- A collision with or without the loss of kinetic energy

Impulse- The change in momentum

Momentum- Mass of an object times the velocity of that object


P=M x V

^P=F^t=^p=m^v ,^=delta*

m1v1 + m2v2 = m1v1+ m2v2 (elastic collisions)

or = (m1 + m2)v (inelastic collisions)

Example Problems

A basketball ball having 2kg mass and 6m/s velocity is thrown.
- Use P=M x V
- P= 2 x 6
- P= 12 kg x m/s
A 1450-kg truck is going 5.6 m/s east collides inelastically with a stationary 3400-kg bus. What is the final velocity?
-Use m1v1 + m2v2=(m1+m2)v
- 1450(5.6) + 3400(0) = (1450 + 3400)v
- 8120 = (4850)v
- v= 1.67 m/s
Two 0.40-kg soccer balls collide elastically in a head-on collision. The first ball starts at rest, and the second ball has a speed of 3.5 m/s. After the collision, the second ball is at rest.
-Use m1v1 + m2v2 = m1v1+ m2v2
- .40(0)+.40(3.5)=.40(v1)+.40(0)
- 1.4 = .4(v1)
- v1 = 3.5 m/s

Learning Targets

I can identify the action and reaction forces acting in a system.

Newton's Laws Of Motion (3): Action And Reaction

I can diagram and calculate the components of force and motion.

Normal Force and Contact Force

I can calculate and compare the physical property of momentum between two objects.

I can explain the idea of impulse as it relates to changes in momentum.

I can apply the law of conservation to momentum of objects involved in ideal collisions.

Elastic and Inelastic Collisions