[Free Registration/Login may be required to access all resource tools.] Discusses what an inclined plane is, its mechanical advantage, and how it changes force to make work easier.

[Free Registration/Login may be required to access all resource tools.] Definition of momentum and how it relates to mass and velocity, and calculating momentum.

[Free Registration/Login may be required to access all resource tools.] The technological design process is a step-by-step approach to finding a solution to a problem. Often, the main challenge in technological design is finding a...

[Free Registration/Login may be required to access all resource tools.] Describes how we can conserve water.

[Free Registration/Login may be required to access all resource tools.] Describes characteristics of solar energy including the electromagnetic spectrum and movement.

[Free Registration/Login may be required to access all resource tools.] Inductive reasoning in science and its limitations.

[Free Registration/Login may be required to access all resource tools.] Descriptions and examples of thermal conductors and insulators are discussed and shown.

[Free Registration/Login may be required to access all resource tools.] How various factors affect the cost of resources.

[Free Registration/Login may be required to access all resource tools.] How groundwater creates landforms.

[Free Registration/Login may be required to access all resource tools.] Describes erosion of rock caused by groundwater.

[Free Registration/Login may be required to access all resource tools.] Examines how to classify metamorphic rocks.

[Free Registration/Login may be required to access all resource tools.] Ladybugs won't hurt you. But they are dangerous to some other insects! Ladybugs eat plant-harming bugs known as aphids. Since they have an appetite for aphids,...

[Free Registration/Login may be required to access all resource tools.] Are you on the basketball team? Are you a cheerleader? Do you play an instrument in the band? Your niche would be your role or place in the school. Organisms also...

[Free Registration/Login may be required to access all resource tools.] Echinoderms are important for the ecosystem. They are also a source of food and medicine for humans. Learn more about the importance of echinoderms in this learning...

[Free Registration/Login may be required to access all resource tools.] During active transport, molecules move from an area of low concentration to an area of high concentration. This is the opposite of diffusion, and these molecules...

[Free Registration/Login may be required to access all resource tools.] A cell is the smallest structural and functional unit of an organism. Learn more about cell biology in this learning module produced by CK-12.

[Free Registration/Login may be required to access all resource tools.] The cell membrane is semi-permeable. Sometimes molecules need the help of special transport proteins or an input of energy to help them move across it. When an input...

[Free Registration/Login may be required to access all resource tools.] What nonrenewable energy resources and fossil fuels are and how they form, and the drawbacks of using nonrenewable energy resources.

[Free Registration/Login may be required to access all resource tools.] Why the Earth is a magnet and how its inner structure relates to its magnetic field.

[Free Registration/Login may be required to access all resource tools.] What static electricity and static discharge are, and how lightning occurs.

[Free Registration/Login may be required to access all resource tools.] Definition of mixture and examples, homogeneous and heterogeneous mixtures, types of mixtures and how to separate mixtures.

[Free Registration/Login may be required to access all resource tools.] What happens to matter when it melts and the definition of melting point.

[Free Registration/Login may be required to access all resource tools.] What a mechanical wave is and what it travels through, and different types of mechanical waves.

[Free Registration/Login may be required to access all resource tools.] Definition of friction, why it occurs, and the factors that affect it.