With a net force of zero, these cause no change in motion.
What are balanced forces?
100
Galaxies can have this many stars.
What is billions?
200
This is the equation for speed, with both the abbreviations and the terms they stand for.
What is v = d/t (average speed = mass / volume)?
200
The three states of matter, listed from the one with the fastest moving particles to the one with the slowest moving particles
What is gas, liquid, solid?
200
The pH of an acid.
What is 0-6?
200
The tendency of an object to resist a change in motion.
What is inertia?
200
These are three galaxy shapes.
What are spiral, elliptical, and irregular?
300
The speed of a car moving 3000 miles in 3 days.
What is 1000 miles/day?
300
The atomic mass of the noble gas in period 3.
What is 40 amu?
300
The metal in MgOH.
What is magnesium?
300
According to Archimedes' principle, this is equal to the buoyant force on an object.
What is the weight of the fluid displaced?
300
Three characteristics used to classify stars.
What are size, temperature, and color?
400
The mass of a 5 cm3 ring with a density of 3 g/cm3.
What is 25 g?
400
Three phase changes that require adding energy.
What are sublimation, evaporation, and melting?
400
Two characteristics of nonmetals.
What are (any two) brittle, low melting points, found on right side of periodic table, poor conductors of heat/electricity, not shiny.
400
These are three ways you can accelerate.
What is speeding up, slowing down, and changing direction?
400
The difference between AUs and light years.
What is the distances they measure -- light years measure between stars and AUs measure inside the solar system.
500
The time required for a tree growing at a rate of 2 feet/year to grow 6 yards.
What is 9 years?
500
The reason the following equation is NOT balanced:
Fe + Cl2 --> FeCl3
What is different numbers of Cl atoms on each side?
500
The difference in the number of neutrons in boron-10 and helium-3.
What is 4? (Boron-10 has 10-5=5 neutrons; helium-3 has 3-2=1 neutron).
500
The name and definition of three forces.
What are (any 3): Gravity (attractive force between objects); friction (opposes motion); tension (stretching); compression (squeezing); weight (pull of gravity on an object)?
500
Three things other than planets that orbit the sun, plus a brief description.
What are comets (balls of ice, gas, dust), asteroids (rocky objects found between Mars/Jupiter), and meteoroids (solid particles entering Earth's atmosphere)?