8.2 (Term 1) Flashcards
Learning Objectives: The definition of “scalar” and “vector” and which motion quantities are scalar or vector quantities. The difference between distance and displacement. SI units for distance and displacement. The difference between speed and velocity. Formulae for average speed and average velocity. SI units for speed and velocity. Glossary: Speed Velocity Scalar Vector Distance Displacement
How can speed be defined?
Speed is the rate at which someone or something moves or is able to move.
How must speed always be expressed?
Speed must always be expressed as a unit of distance divided by a unit of time.
What are examples of units used to express speed?
Common units are km/h, m/s, mm/week.
What is the scientific (SI) unit for speed?
The scientific (SI) unit for speed is meters per second (m/s).
How can average speed be calculated
Average speed is calculated by dividing the distance travelled by the time taken.
What is distance in terms of motion?
Distance is the physical length of the path travelled.
What is displacement in terms of motion?
Displacement is the straight-line distance between the start point and the finish point.
Is distance a vector or scalar quantity?
Scalar
Is displacement a vector or scalar quantity?
Vector
Is the term velocity often used instead of speed?
Yes, but they are different quantities.
How is speed defined in relation to distance?
Speed is a measure of the rate at which distance is covered.
What type of quantity is speed?
Speed is a scalar quantity, requiring only a magnitude (e.g., kilometers per hour).
What does speed measure?
Speed measures the distance travelled over a certain amount of time.
What is velocity a measure of?
Velocity is a measure of the rate of change in position.
What type of quantity is velocity?
Velocity is a vector quantity, requiring both a magnitude (e.g., km/h) and a direction.
