# Force & Motion 1

FOSS Force & Motion Vocabulary 1

## Terms

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- impulse
- An interaction between masses; a force exerted for a period of time: F X ∆t.
- inertia
- The property of mass that resists change of motion. Large masses have a lot of inertia.
- acceleration (a)
- Change of velocity per unit of time.
- initial position (xi)
- The position of an object at the start of a motion.
- final position (xf)
- The position of an object at the end of a motion.
- force (F)
- An interaction between masses. A push or pull.
- distance (d)
- The amount of change of position between an initial position and a final position; always a positive number.
- gravity (g)
- The force due to gravitational attraction between Earth and other masses.
- air resistance
- The force exerted by air molecules on objects moving through air.
- delta (∆)
- The fourth letter in the Greek alphabet; the symbol indicates change: final state minus initial state.
- equation
- A mathematical statement showing relationships between quantifable variables.
- friction
- A force acting between surfaces in contact. Friction acts to resist
- average speed
- The theoretical constant speed at which an object would have to travel in order to go a given distance in a given period of time. Total distance divided by total time.
- displacement (∆x)
- The amount and direction of change of position
- interaction
- Action between two (or more) objects that affects both objects.
- constant speed
- Speed that does not vary over time.
- Dotcar
- A rolling car that records time and distance data as it moves. Data can be recorded mechanically by making an ink dot on paper at regular intervals or electronically in a microprocessor carried by the car.
- data table
- A two-dimensional system for recording data that shows correlation's between the data entries.
- electromagnetism
- One of the four known forces in the universe.
- graph
- A two-coordinate system for displaying and analyzing an independent variable (y).