Search every subject world, from Preschool to Grade 12. The first five courses of every subject path are free.
8 courses
Science · Grade 5
Fifth graders build the toolkit for the rest of the year. They measure volume by water displacement and convert between metric units, examine what physical models, diagrams and computer simulations can and cannot show, and plan fair tests with controlled variables. A sampling simulation shows why bigger samples and repeated trials give more trustworthy results.
Science · Grade 5
Learners ask whether the amount of matter changes when it melts, dissolves or makes a gas. They build a simplified particle model, predict, run a safe simulated investigation in closed and open containers, record masses and compare evidence. They finish by writing a claim-evidence-reasoning explanation and stating what the simulation can and cannot establish.
Science · Grade 5
Learners act as materials detectives: they identify substances by measured properties such as density, magnetism and solubility, then mix materials and look for evidence. Some mixtures can be separated again because each substance keeps its properties; other combinations make new substances, shown by gas bubbles, a new solid, a color change or a temperature change. A dissolving simulation and a sink-or-float simulation provide data, and each states what it cannot establish.
Science · Grade 5
The energy in your breakfast was once sunlight. Learners use models to trace the energy in food back to the sun, then argue from historical and simulated evidence that a plant builds its body mostly from air and water, not soil. Finally they follow energy along food chains and describe how animals use food energy for growth, repair, motion and warmth.
Science · Grade 5
In a healthy ecosystem, matter is used again and again. Learners build food webs with producers, consumers and decomposers, then model how the materials of life cycle: plants take in carbon dioxide, water and minerals; animals eat plants and each other; and decomposers return matter to the soil and air. A predator-prey simulation shows how changing one population ripples through the others, and what such a simple model cannot tell us.
Science · Grade 5
Earth works as four connected systems: rock and soil (geosphere), water (hydrosphere), air (atmosphere) and living things (biosphere). Learners model how the systems interact, from rain wearing down mountains to roots cracking rock. They graph where Earth's water is (almost all salty, most fresh water frozen or underground), follow water through the water cycle, and explain how communities protect the small share of fresh water we can use.
Science · Grade 5
Why don't people on the other side of the world fall off? Why does the sun look so much brighter than every other star? Learners argue from evidence that Earth's gravity pulls everything toward its center, that the sun looks brighter because it is so much closer, and they graph shadow data and star observations to find the daily and seasonal patterns caused by Earth spinning and orbiting the sun.
Science · Grade 5
In this capstone course, learners act as environmental engineers for a fictional school. They combine information about how human activities affect land, water, air and living things and how communities use science to protect them. Then they define a stewardship problem (too much cafeteria waste going to the landfill), analyze a waste audit, compare solutions with criteria and constraints, and recommend a plan backed by data and honest tradeoffs.
