Properties of materials
What word describes a material that lets light pass through it?
Transparent
What method can you use to separate sand from water?
Filtration
What force pulls objects down toward the Earth?
Gravity
What do we call the path that electricity flows through?
Circuit
What organ pumps blood around the body?
Heart
What is a material called if it cannot be bent or stretched easily?
Rigid
What process turns a liquid into gas to separate it from a solution?
Evaporation
What force slows things down when they rub together?
Friction
What is used to turn a circuit on or off?
Switch
What do we call the red liquid that flows through your body?
Blood
Which material property describes how well something resists scratching or denting?
Hardness
What tool would you use to separate iron filings from sand?
Magnet
What force is used when a magnet pulls something made of iron?
Magnetic force
Name one good conductor of electricity.
Metal (e.g., copper)
What are the blood vessels that carry blood away from the heart called?
Arteries
What does it mean if a material is insoluble?
It does not dissolve in water
How could you separate a mixture of salt and sand?
Add water to dissolve the salt, filter out the sand, then evaporate the water to get the salt back.
What is air resistance?
A force that slows down objects moving through air
What happens in a circuit if there is a break in the wire?
The circuit won't work (open circuit)
Why is exercise important for heart health?
It strengthens the heart and improves circulation
Why is glass used for windows but not for making clothing?
Because glass is transparent and hard (good for letting light through and keeping out weather), but it's brittle and not flexible, so it would break and be uncomfortable for clothing.
What is chromatography used for?
Separating mixtures of coloured substances
How can you reduce water resistance on a boat?
By streamlining its shape
Why are wires usually covered in plastic?
Because plastic is an insulator and prevents electric shocks
Name the three main parts of the circulatory system.
Heart, blood, and blood vessels