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ICCS Physical Science
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Gravity
ICCS Physical Science Final, 13-14
Terms in this set (55)
Independent Variable
Factor that you change in an experiment
Dependent Variable
Factor that you measure in an experiment
Hypothesis
Educated Guess
Variable
Factor that can change in an experiment
Constant
Factor that does not change in an experiment
Safety Symbol for eye safety
Goggles
Safety Symbol for breakage
Broken test tube
What are the 4 states of matter?
liquid, solid, gas, plasma
What is the definition for a physical property?
A description of an object based on what you observe with your SENSES.
Reactivity
How easily one thing reacts with something else
Chemical Change
When one material changes into a different material with different properties.
What is the volume? Length = 2cm Height = 2 cm Width = 3 cm
Volume = 12 cm cubed
What is the density? Volume = 12 cm cubed mass = 24 grams
Density = 2 grams/cm cubed
What is the mass number? 21 protons, 21 electrons, 20 neutrons
41
Name 3 things that are not matter.
thoughts, light, heat
Proton
Positively charge particle in the nucleus
Electron
Negatively charged particle that floats in a cloud around the nucleus
Velocity - definition
Rate of change of position. Includes direction.
Velocity - equation
distance/time
Velocity - unit
meter/second, direction
Inertia
Tendency of an object to resist a change in its motion
Speed - definition
rate of change in position
Speed - equation
distance/time
Speed - units
meter/second
Acceleration - definition
rate of change of speed with time
Acceleration - equation
(vf - vi)/t
Acceleration - units
m/s squared
You travel 20 meters in 2 hours. What is your speed?
s= 20 meters/2 hours=10 m/hr
A car goes from 20 km/hr to 80 km/hr in 3 hours. What is its acceleration?
a = (vf-vi)/t = (80 km/hr - 20 km/hr) / 3 hr = 20 km/hr squared
Neutron
the neutral particle found in the nucleus
Where is most of the mass of an atom located?
in the nucleus
Electron cloud
the area of an atom where the electrons move.
Bohr model for Al
atomic # = 13 Protons=electrons=13 Atomic mass=27=protons + neutrons Neutrons=14
Work - definition
is done when a force exerted on an object causes that object to move some distance
Work - equation
W = force x distance
Work - unit
Joules
Power - definition
rate at which work is done
Power - equation
P = Work / time
Power - units
Joules/second = WATTS
Newton's 1st law - saying and picture
Objects keep on doing what they are doing. Picture of an owl.
Newton's 2nd law - saying and picture
Objects ACCELERATE in the direction of the force. Picture of a snake.
Newton's 3rd law - saying and picture
Forces come in PAIRS. Two pears holding hands.
What is the requirement for work to be done?
A force must be applied and a distance must be travelled in the direction of the force.
Friction
A rubbing force that acts against the motion between 2 touching surfaces and always slows an object down
Force - definition
A push or a pull on an object
Force - equation
F = mass x acceleration
Force - unit
Newton
How much work is done when a force of 20 N moves an object a distance of 3 m?
W = force x distance = 20N x 3m = 60 J
How much power is expended when 200J of work are done in 10 seconds?
P = work/time = 200J/10 s = 20 Watts
Wavelength
The distance from the top of one crest to the top of the next
Frequency
The number of wavelengths that pass a given point in 1 second
Exothermic Reaction
Releases Energy, gets hot
Endothermic Reaction
Absorbs Energy , Gets cold
Law of Conservation of mass
Mass cannot be created or destroyed
Electron Energy Level
The ring or level that an electron is found on; how much energy the electron has
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