It is helpful to try and figure out ahead of time how ideas and inventions will affect other people. Machines use energy to make work easier. NSES Content Topic Properties of objects and materials Objects have many observable properties, including size, weight, shape, color, temperature, and the ability to react with other substances. These properties can be measured using tools such as rulers, balances, and thermometers. Objects are made of one or more materials, such as paper, wood, and metal.
Materials have different states - solid, liquid, and gas.
Some common materials such as water can be changed from one state to another by heating or cooling. All matter is made up of atoms in constant motion. Matter undergoes physical and chemical changes. The characteristics of organisms Plants require air, water and light. Each plant or animal has different structures which serve different functions in growth, survival, and reproduction.