Understanding Matter, Energy, and Forces

During a science fair, Benjamin, Harper, and Aria are evaluating different materials to build a sustainable house. Which of the following is NOT a physical property they would use to classify the materials?

• Magnetism

• Color

• Ability to conduct electric energy

• Solubility in water

During a science fair, Henry and Sophia demonstrate how a mixture of iron filings and sand can be separated. What concept does this experiment primarily demonstrate?

• Production of thermal energy

• Chemical reaction

• Magnetism maintaining physical properties

• Inability to dissolve in water

What happens when light from the sun enters the Earth's atmosphere from space?

• It reflects back into space

• It gets refracted and creates phenomena like rainbows

• It gets absorbed completely

• It disappears

Evelyn is setting up a small circuit to light up a bulb in her science project. Which of the following actions demonstrates that electricity is flowing through her circuit?

• Changing the color of the wires

• Making the bulb light up

• Increasing the size of the battery

• Freezing the water in a beaker

When I see my reflection in a mirror, I am using which type of energy?

• Mechanical
• Electrical
• Light
• Thermal

If I want to change a liquid to a gas, I need to - 

• remove thermal energy
• add thermal energy
• do nothing; it happens automatically
• add mechanical energy

Electrical circuits are comprised of a power source, wires, a load and a switch.  What physical property of the wire makes it function?

• solubility
• density
• conductivity
• magnetism

In order to generate electricity, something has to turn the turbine which powers a generator.  What type of energy would be needed to turn the turbine?

• Light
• Mechanical
• Sound
• Electrical

What behavior of light do the arrows in the picture show?

• Transmission
• Reflection
• Absorption
• Refraction

A car runs on gasoline and also uses a battery.  The battery powers the lights, windshield wipers, radio etc., while the gasoline allows the engine to function.  If the battery is allowed to run down, what is one thing that could happen?

• The radio will play louder
• The windshield wipers will work better.
• The power windows will not work
• The brakes will be better