75 terms

Physical Science Mid-Year: Amir


Terms in this set (...)

Steps in the Scientific Method
-Ask a question
-Gather information
-Form a hypothesis
Test hypothesis
An educated guess
Hypothesis backed up by evidence
Scientific method used to test hypothesis
Something that can be changed
Independent Variable
Variable that you can change
Dependent Variable
Variable that changes based on the Independent Variable
Control Group
People that fix/control the variable
Having two of the same things
Favoring one thing over another, not valid
Agreed upon unit of measurement
International System, system of measurement used around the world
Amount of space an object takes up
Amount of matter in an object
How much matter that makes up an object
How long something is
Scientific Law
Something that is a fact about science
A visual representing the experiment that is smaller
Change in speed and direction
Positive Acceleration
Increasing velocity
Negative Acceleration
Decreasing velocity
Attractive force between any two bodies
Rate of change, quantity of change
Acceleration due to gravity
9.8 m/s 2
3 ways of accelerating
Speeding up, slowing down, or changing direction
How far something goes
How far something goes and what direction it came from the starting point
Instantaneous Speed
How fast you are going at any moment in time
Average Speed
Speed over the full time of travel
Has speed and direction, it is a vector quantity
A push or pull
Newton's First Law 'Law of Inertia'
If an object is in motion, it stays in motion. If an object is at rest, it stays in rest.
Tendency of an object to move or to stay still
The force of gravity
Balanced Forces
Equal forces acting on each other
Static equilibrium
Something that is not changing
Unbalanced Forces
Unbalanced forces acting in opposite directions
Newton's Second Law 'Force Law'
An object moves in the direction of an unbalanced force
Static Friction
When two objects are in contact with each other but they are not moving
Sliding Friction
when an object slides on the surface
Rolling Friction
When an object rolls on the surface
Terminal Velocity
When you stop accelerating and the forces are balanced by air resistance
Air Resistance
An opposing force of motion caused by air
Newton's Third Law 'Action Reaction'
Whenever a force applies a force, another force applies a force to it
Projectile Motion
When you throw something, it goes in a rainbow/arch motion.
Centripetal Force
Anything that is moving in a circular motion
Mass x Volume
Conservation of Momentum
Momentum cannot be lost or gained but it could be transferred
SI unit for energy
Ability to cause change
1 Calorie= 4184 joules
Potential Energy
Stored energy
Kinetic Energy
Energy of motion
Elastic Potential Energy
Energy stored in things that stretch
Chemical Potential Energy
Energy stored in chemical bonds between atoms
Gravitational Potential Energy
Energy stored in things that are moving
Mechanical Energy
Kinetic Energy + Potential Energy
Law of Conservation of Energy
Energy may change from one form to another but the total amount of energy never changes
Nuclear Fusion
Two nuclei are fused together. Takes place in the sun
Nuclear Fission
Two nuclei are broken apart
How to do work
-an object has to move
-the direction of movement must be in the direction of the applied force
Work divided by time
Inclined Plane
Sloping surface used to raise objects
An inclined plane with one or two sloping slides
Inclined plane wrapped in a spiral around a cylindrical post
Bar that is free to pivot about a fixed point
Grooved wheel with a rope running along the groove
Wheel and axle
Two wheels of different sizes that rotate together
Compound Machine
A machine with two or more items that make work easier
Resistance Force
The force in which the effort force must overcome to do work
Effort Force
A force that moves an object over a distance by overcoming the resistance force
The amount of energy used for work
Mechanical Advantage
resistance force divided by effort force
On the y-axis on a graph
Independent Variable
On the x-axis on a graph
Dependent Variable