Matter
Is oxygen an example of an element?
Yes
Is electromagnetic radiation energy?
Yes – Ex: visible light
What is friction?
A force that opposes movement between surfaces
What is a simple machine?
Any machine with little or no moving parts that modifies an input force
What is the difference between renewable and non-renewable sources?
Renewable sources can be replenished faster than or equal to the time it takes to extract while non-renewable sources are extracted faster than they are replenished
What is the difference between mixtures and compounds?
Compounds: new substances and can't be separated their ingredients
Mixtures: can be separated into their ingredients and aren’t new substances
What does the law of the conservation of energy say?
Energy cannot be created or destroyed
How does gravity keep objects from floating off Earth?
It pulls everything down towards the center of the earth
What is mechanical advantage?
The maximum force multiplication a machine makes with forces like friction
Coal is an example of a non-renewable energy source. What is the other major downside of coal?
It heavily pollutes the atmosphere
Identify the reactant(s) and product(s) in this chemical equation: C2H4 + H2O --> CH3CH2OH
Reactants: C2H4 and H2O
Product: CH3CH2OH
What are some examples of renewable energy sources?
Some examples: Hydroelectric, Wind, Solar
What is a balanced force?
When two opposing forces are equal, so they cancel out
What is ideal mechanical advantage?
The maximum force multiplication a machine makes without a forces like friction
What is the MOST abundant renewable energy source on Earth?
Solar power/The sun
As water is heated closer to its boiling point, does it experience thermal expansion or thermal contraction?
Thermal Expansion – The volume of water increases as it is heated
Is sound energy?
Yes – Sound waves are vibrations that transfer energy
If two people push on a box with 5 newtons to the left and 17 newtons to the right, which way will the box move?
To the right
What are the 6 simple machines?
Lever, pulley, wheel and axle, inclined plane, screw, wedge
How do hydroelectric dams affect wildlife?
Blocks fish migration, changes river direction and temperature, and fragments habitats
What is the streak test?
The process of identifying a mineral through its powder form by rubbing against a porcelain slab
Is nuclear power considered renewable energy?
No – A non-renewable fuel must be extracted to create energy
Is slowing down an example of acceleration?
Yes – Any change in speed or direction is acceleration
What is the formula for ideal mechanical advantage?
IMA = input distance/output distance
What are downsides to wind energy/wind turbines?
Noise level, Cost, birds dying (they get sucked into the blades)