Density / Buoyancy
An object has a mass of 300 g and a volume of 150 cm³, giving a value of 2 g/cm³.
What is density?
Passengers moving forward when a car stops demonstrate this principle.
What is inertia / Newton’s First Law?
This is the smallest unit capable of carrying out life processes.
What is a cell?
In the chain grass → rabbit → fox, this organism is the secondary consumer.
What is a fox?
Plants remove this gas from the atmosphere during photosynthesis.
What is carbon dioxide?
An object sinks in water but floats in oil, meaning its density lies between the two liquids.
What is: greater than water but less than oil?
A 4 kg object acted on by a 20 N force will have this acceleration.
What is 5 m/s²?
A group of similar cells performing the same function forms this level.
What is a tissue?
Energy decreases along a food chain because it is lost in this form.
What is heat?
Bees play a key role in ecosystems by performing this process.
What is pollination?
For a fully submerged object, buoyant force depends on the fluid’s density and this quantity.
What are fluid density and displaced volume?
If one object exerts 15 N on another, the second object exerts this force back.
What is 15 N in the opposite direction?
This level includes multiple populations interacting with each other and their environment.
What is an ecosystem?
If producers are removed, this will happen to the ecosystem.
What is it will collapse?
Forests help prevent this environmental problem.
What is soil erosion?
A steel ship floats because its overall density is lower than this substance.
What is water?
Walking forward is possible because you push the ground in this direction.
What is backward?
All organisms of the same species in one area make up this level.
What is a population?
Food webs are more stable than food chains because they have these.
What are multiple feeding paths?
Wetlands improve ecosystems by filtering this resource.
What is water?
The loss of apparent weight of an object in a fluid equals this force.
What is the buoyant force?
Forces of 12 N right and 7 N left combine to give this net force.
What is 5 N to the right?
Cells are considered the basic unit of life because they perform all life processes.
What is: cells perform all life processes?
Removing predators from an ecosystem will initially cause this change in prey populations.
What is an increase?
The disappearance of pollinators would cause this major impact on agriculture.
What is decreased crop production?