Forces
A force is a p_ _ _, p_ _ _, or t_ _ _ _.
push, pull or twist?
What is a cell?
This simple machine has a flat, slanted surface that helps lift objects with less effort.
inclined plane
Where does all energy originally come from?
the sun
gravity, magnetism and electrostatic
What is the function of the cell membrane
controls what comes in and out of the cell
An independent variable is purposely altered by the researcher. This is the variable being investigated. A dependent variable is an outcome or value that results from the change in the independent variable. This is the variable that is measured during an investigation.
What are the three parts of a lever called?
fulcrum, load, effort
How much energy is transferred from one trophic level to the next?
10%
Name three things you can do to decrease friction.
Add a lubricant
Make the surface smoother
Change the shape of the object to a streamlined design
Euk: Have a nucleus, Have membrane bound organelles
Why should only one variable at a time be changed in scientific investigations?
If more than one variable were changed at a time, it would be difficult to determine which of the variables was responsible for the result obtained.
In a lever, moving the fulcrum closer to the load does what to the force needed to lift it
It decreases the force needed (makes lifting easier).
Name two processes that absorb carbon in the carbon cycle
photosynthesis and ocean uptake
The unit force is measured in.
Newtons (N).
Where does photosynthesis occur and what is the equation
Chloroplast
Water + Carbon Dioxide = Glucose + Oxygen
Advertisements for washing powders and liquids often claim that they are more effective than others. Imagine that you are conducting an experiment to test a range of washing powders and liquids.
Variables may include volume of water, mass/volume of cleaning product, temperature of water, amount of fabric/clothes, degree of staining of fabric/clothes, length of time washed for and washing machine used.
Two ramps lift the same object to the same height. Ramp A is longer and gentler than Ramp B. Which requires less force and why?
Ramp A requires less force because the load is spread over a longer distance
Describe the difference between decomposers and detritivores
Detritivores: Eat dead plant and animal matter directly and physically break it into smaller pieces.
Decomposers: Chemically break down dead matter using enzymes.
How do you know if forces are balanced and what does this mean?
Arrows are the same size and it is not moving or moving at a constant speed
What is the cell theory?
1. Cells are the basic unit of life
2. All living things are made of cells
3. Cells come from pre-existing cells
Name the steps included in lighting a bunsen burner
When a small gear turns a larger gear, what happens to the speed and the force
The larger gear turns more slowly but with more force.
Explain the role of cellular respiration in an ecosystem and state the equation
Organisms (all living things) —use cellular respiration to create energy from their food source.
Glucose + oxygen ---->Water + carbon dioxide + energy