Vocab
What is a vector?
something with both a direction and magnitude
ex. velocity
Who was the first scientist to come up with a motion theory and understood that all objects had a "purpose"?
Convert 35 milligrams to grams.
0.035 g
What 2 subatomic particles make up the nucleus of an atom?
proton and neutron
Give a possible unit for acceleration.
any distance over time squared
Give an example of electromagnetic radiation energy.
light
Which scientist introduced energy levels into the atomic model?
Niels Bohr
Convert 56 centimeters to millimeters.
560 mm
Hydroelectric power is a form of which type of energy?
gravitational potential energy
What is the standard unit for pressure?
Pascal
What is convection?
Heat transfer through the movement of fluids like liquid or air
Who came up with the universal law of gravitation?
Isaac Newton
If a 2 kg book possesses 60 J of potential energy, how high off the ground is the book?
PE = mgh g = 9.8 m/s^2
3 meters
What is the strongest type of force in the universe?
strong nuclear force
What are the 3 ways that we can know truth?
divine revelation, direct observation, valid logic
Define inertia.
the tendency for an object to resist change in motion
What are Newtons 3 laws of motion?
1. An object in motion or at rest will stay in motion or rest unless acted on by an outside force
2. An object's acceleration is proportional to its mass and the force applied to it (F = ma)
3. for every action, there is an equal and opposite reaction
A waterfall moves 800 gallons of water over the edge per second. What would this amount be in liters per minute?
1 gal = 3.8 L
182,400 L/min
How many neutrons would Germanium-53 have?
Ge
21 neutrons
What is a scientific theory?
The best explanation we have at present that is backed by evidence
What is the law of conservation of energy?
Energy can neither be created nor destroyed, it only changes form
Who were the 3 scientists credited for the discovery of the proton, neutron, and electron?
Ernest Rutherford - proton
James Chadwick - neutron
JJ Thomson - electron
If a car traveling at 40 m/s has a kinetic energy of 1,600,000 J, what is the car’s mass?
KE = 1/2mv^2
2000 kg
In an experiment, a researcher is testing how brushing your teeth affects the amount of cavities people get. If you designed the experiment, what is the independent variable, dependent variable, and what variables would you keep controlled?
ind = teeth brushing
dep = amount of cavities
controlled variables = type/amount of toothpaste, how long people brush their teeth, how many times a day
Describe the inverse square law and give an example of something that follows it.
gravitational force and distance from the source of it