Earth and Space
What causes day and night?
Earth's rotation
What is H2O?
Water
What organ pumps blood?
Heart
What force pulls objects to Earth?
Gravity
Why do we refrigerate food?
To slow bacterial growth
What planet is closest to the sun?
Mercury
What state of matter is the air?
Gas
What gas do plants need for photosynthesis?
Carbon dioxide
Does heavier mass fall faster?
No (if you ignore air resistance)
Why do we wear sunscreen?
Protects us from UV radiation
Why does the Moon have different phases?
Changing positions of the Earth, Sun and Moon
What happened to particles when a solid melts?
They move faster and spread further apart
What is the name for the control centre (brain) of a cell?
Nucleus
What happen to speed when friction increases?
Speed decreases
Why do metals feel colder than wood?
They transfer heat faster
What layer of the Earth is liquid?
Outer core
What is the difference between a physical and chemical change?
Chemical change forms a new substance
Why are mitochondria called the powerhouse of a cell?
They release energy
What energy transformation happens in a touch?
Chemical -> electrical -> light
Why do athletes warm up?
Reduces risk of injury, increases muscle efficiency.
What would happen to the tides if the Moon disappeared?
Tides would become much weaker (main driver gone)
Why does increasing the temperature increase reaction rate?
Particles move faster = more collisions
How does exercise increase oxygen use in cells?
Increased respiration and energy demand.
Why are seatbelts related to Newton's First Law?
Objects in motion stay in motion unless acted on by a force.
Why are electric cars better for air quality?
No exhaust emissions