Potential Energy
Potential energy is the energy that an object has due to its position or condition. There are several types of potential energy:
- Gravitational Potential Energy: This is the energy an object has due to its position above the Earth's surface. The higher an object is, the greater its gravitational potential energy.
- Elastic Potential Energy: This is the energy stored in an object when it is stretched or compressed. For example, a stretched rubber band or a compressed spring has elastic potential energy.
Kinetic Energy
Kinetic energy is the energy of motion. The amount of kinetic energy an object has depends on its mass and its speed. The formula for kinetic energy is:
Kinetic Energy (KE) = 0.5 * mass * (speed)2
Conservation of Mechanical Energy
According to the law of conservation of energy, mechanical energy is conserved in a closed system. This means that the total mechanical energy (the sum of potential and kinetic energy) remains constant as long as no external forces, such as friction or air resistance, are acting on the system.
Study Guide
Here are some key points to remember about mechanical energy:
- Understand the difference between potential and kinetic energy.
- Be able to identify examples of potential and kinetic energy in everyday objects or situations.
- Learn the formulas for calculating potential and kinetic energy.
- Understand the concept of conservation of mechanical energy and how it applies to real-world scenarios.
◂Science Worksheets and Study Guides Third Grade. Relationships among living things
Study Guide
Relationships among living things 
Activity Lesson
Relationships Among Living Things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE
From Molecules to Organisms: Structures and Processes
Create representations to explain the unique and diverse life cycles of organisms other than humans (e.g., flowering plants, frogs, butterflies), including commonalities such as birth, growth, reproduction, and death.
Unity and Diversity
Construct an argument from evidence to explain the likelihood of an organism’s ability to survive when compared to the resources in a certain habitat (e.g., freshwater organisms survive well, less well, or not at all in saltwater; desert organisms survive well, less well, or not at all in woodlands).
Create models that illustrate how organisms and their habitats make up a system in which the parts depend on each other.