PHYSICS KEYWORD LIST:
Average Speed: The total distance travelled by an object divided by the total time taken.
Instantaneous Speed: The speed of an object measured over a very short time.
Displacement: The distance travelled in a particular direction; it is a vector quantity.
Vector Quantity: A quantity with both magnitude(size) and direction.
Scalar Quantity: A quantity with magnitude only.
Velocity: An object’s speed in a particular direction or the rate of change of its displacement; it is a vector quantity.
Vector Triangle: A triangle drawn to determine the resultant of 2 forces.
Resultant Vector: The single vector formed by adding together 2 or more vectors.
PHYSICS CHAPTER WISE SUMMARY:
Displacement is the distance travelled in a particular direction.
Velocity is defined by the word equation: Velocity = Change in Displacement / Time taken
The gradient of a displacement – time graph is equal to velocity: v = s/t
Distance, speed, mass and time are scalar quantities. A scalar quantity has only magnitude.
Displacement and velocity are vector quantities. A vector quantity has both magnitude and direction.
Vector quantities may be combined by vector addition to find their resultant. The second vector can be subtracted from the first by adding the negative of the second vector, which acts in the opposite direction.
PHYSICS IMPORTANT NOTES:
Average Speed = Distance / Time
Velocity = Change in Displacement / Time taken
Quantity | Symbol for quantity | Symbol for unit |
Distance | d | m |
Displacement | s, x | m |
Time | t | s |
Speed, Velocity | v | m/s |
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