2.2.1 Scalar and Vector Quantities Flashcards
Name all of the scalars.
SEPDDMV Speed Power Energy Distance Density Mass Volume
Name all of the vectors.
Why aM I VAPID: Weight Momentum Velocity Acceleration Pressure Impulse Displacement
Define scalar
A quantity which has magnitude but not direction.
Define vector
A quantity which has magnitude and direction.
What is mass’s unit, definition and vector equivalent?
- kg
- The matter content of a body;
- Weight
What is density’s unit, definition and vector equivalent?
- kgm^-3
- Mass per unit volume;
- Pressure
What is volume’s unit, definition and vector equivalent?
- m^3
- Three-dimensional space occupied by a body;
3, Impulse;
What is distance’s unit, definition and vector equivalent?
- m
- Length from one point to another;
- Displacement;
What is speed’s unit, definition and vector equivalent?
- ms^-1
- Distance traveled per unit time;
- Velocity;
What is energy’s unit, definition and vector equivalent?
- J
- Work done;
- Acceleration;
What is power’s unit, definition and vector equivalent?
- W or Js^-1
- Energy converted or work done per unit time;
- Momentum;
What is weight’s unit, definition and scalar equivalent?
- N
- Force acting towards the centre of mass (downwards / centre of Earth);
- Mass;
Direction: towards the centre of mass (downwards / centre of Earth);
What is pressure’s unit, definition and scalar equivalent?
- Pa or Nm^-2
- Force per unit area;
- Density;
Direction: towards the unit area;
What is impulse’s unit, definition and scalar equivalent?
- Kgms^-1
- Force x time;
- Volume;
Direction: the direction of acceleration (as F=MA); towards the centre of mass of an object (Earth).
What is displacement’s unit, definition and scalar equivalent?
- m
- Distance from a specific point in a particular direction;
- Distance;
Direction: the direction of the distance moved in.
What is velocity’s unit, definition and scalar equivalent?
- ms^-1
- Displacement per unit time;
- Speed;
Direction: speed in a given direction;
What is acceleration’s unit, definition and scalar equivalent?
- ms^-2
- Change in velocity per unit time;
- Energy;
Direction: the direction of velocity;
What is momentum’s unit, definition and scalar equivalent?
- kgms^-1
- Mass x velocity;
- Power;
Direction: the direction of velocity;
What is the equation, which connects average velocity, total displacement and time?
Average velocity = total displacement / time
An athlete is running around a track, describe their total displacement and change in velocity, offering an explanation.
Both are zero, as:
1. Mathematically, the net displacement is zero, and so using
avj velocity = total displacement / time
avj velocity must be zero.
2. Velocity is negative in one direction and positive in the other, these directions cancel each other out, leaving only speed.