Motion and Measurements - Video Notes

Vocabulary flashcards covering key motion concepts: distance, displacement, speed, velocity, acceleration, one-dimensional motion, direction conventions, and SI units.

Distance

Total length of the path travelled; scalar quantity.

Displacement

Change in position; vector quantity; final position minus initial position.

Speed

Rate of motion; distance travelled per unit time; scalar.

Velocity

Speed with a direction; rate of change of position; vector.

Acceleration

Rate of change of velocity over time; can be positive or negative.

One-dimensional motion (1D)

Motion along a straight line; position described by a single coordinate.

Positive direction

Arbitrary convention indicating the positive side of the chosen axis.

Distance vs displacement

Distance is the path length travelled (scalar); displacement is the straight-line change in position (vector).

Change in a quantity

Final value minus initial value.

Rate of change

Change in a quantity divided by the time interval.

Quantity

A measurable magnitude; can be scalar or vector (e.g., distance, time, velocity).

SI base units

Fundamental units of the SI system (meter, kilogram, second, ampere, kelvin, candela, mole).

Meter

SI unit of length; symbol m.

Kilogram

SI unit of mass; symbol kg.

Second

SI unit of time; symbol s.

System of units

Different sets of units used in practice, e.g., SI (metric), CGS, US customary.