Project Vocabulary
Key Concepts
Definition
a characteristic or quality of a material
Key Context
Would you use a piece of wood as a pillow? Of course not. One of the properties of wood is that it is hard. Another property of wood is that it has more mass than the nice pillow you normally use. A pillow made of wood would weigh a lot more than a pillow made of feathers or foam. All materials have properties that can be observed or tested.
Scientific Explanation
Definition
a group of related objects that work together to perform a function
Key Context
When you ride a bicycle, the pedals, the gears, the wheels and the handle bars all work together to get you where you need to go. They are a system. There are many kinds of systems. Your body has systems made of organs, like the digestive system includes the mouth, esophagus, stomach, and intestines. The solar system has many planets and objects that all travel around it. A radio is a system of knobs, circuits, speakers, and lights. All systems have parts that work together.