# PH.6 - Conservation of Mass, Energy, Momentum, & Charge

The student will investigate and understand that quantities including mass, energy, momentum, and charge are conserved. Key concepts include

a)  kinetic and potential energy;

b)  elastic and inelastic collisions; and

c)  mass/energy equivalence.

Bloom's Levels:  Analyze; Understand

### BIG IDEAS

• I can predict how fast a roller coaster will travel down a hill.
• I can explain why two cars seem to "bounce" backwards after colliding.
• I can explain the science behind the atomic bombs that ended WWII.

### UNDERSTANDING THE STANDARD

The concepts developed in this standard include the following:

• Kinetic energy is the energy of motion. Potential energy is the energy due to an object’s position or state.
• Total energy and momentum are conserved.
• For elastic collisions, total momentum and total kinetic energy are conserved. For inelastic collisions, total momentum is conserved and some kinetic energy is transformed to other forms of energy.
• Electrical charge moves through electrical circuits and is conserved.
• In some systems the conservation of mass and energy must take into account the principle of mass/energy equivalence.

### ESSENTIALS

In order to meet this standard, it is expected that students will

a)  provide and explain examples of how energy can be converted from potential energy to kinetic energy and the reverse.

b)  provide and explain examples showing linear momentum is the product of mass and velocity, and is conserved in a closed system.

### KEY VOCABULARY

Updated: Dec 01, 2017