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Science Final

Review for 9th grade, Semester 1, final for Science.

Engineer A person trained and skilled in the design, construction, and use of a system or machine.
Invention A device or process originated after study and experiment.
Innovation A new improvement to an existing device or process.
Engineering Design Process A series of steps used to plan practical solutions to problems.
Criteria The desired features of a product related to its function or purpose.
Constraints Any limitations on the design.
Trade-offs Giving up one desirable trait for another.
Prototype A working model; allows you to test your possible solution.
Risk-Benefit Analysis Compares the negative consequences of a device or design to the positive consequences.
Life Cycle Analysis Evaluation of the materials and energy used for the product's manufacture, operation, use, disposal, etc.
System Group of interacting mechanical parts that work together to accomplish a goal.
Input The needed resources to accomplish a goal in a technological system.
Output The goal of the technological system.
Feedback Information from one step of a cycle that affects a previous step of the cycle in a technological system.
Negative Feedback Feedback that can stop the process occurring in a system.
Positive Feedback When increased output cause the system to make even more output.
Technology The products and process that result from the engineering process.
Independent Variable The factor that is deliberately changed by the experimenter.
Dependent Variable The factor that changes as a result of the experiment.
Constants The factors that are kept the same so they do not affect the results of the experiment.
Control Set-up The comparison group that does not get the independent variable.
Bias Occurs when a scientist's expectations and previous experiences change how the results are viewed.
Peer Review Procedures and results of an experiment are evaluated by scientists in the same field of study before a study is published.
Scientific Law A statement about what happens in nature that seems to be true all the time.
Scientific Theory A explanation of things or events based on knowledge gained from multiple observations and investigations.
Motion A change in an object's position or location relative to a reference point.
Speed The distance an object moves in a given amount of time.
Acceleration The rate at which velocity changes.
Force A push or a pull acting on an object in a certain direction.
Weight Gravitational force exerted on an object.
Mass The measure of the amount of matter in an object.
Inertia Tendency of an object to resist any change in its motion.
Created by: MakStabs



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