Motion in one Dimension
ICSE · Class 9 · Physics
Flashcards for Motion in one Dimension — ICSE Class 9 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allWhat are scalar quantities? Give three examples.
Answer
Scalar quantities are physical quantities that are expressed only by their magnitude. They need only unit and numerical value to be completely expressed. Examples: mass (5 kg), distance (10 m), speed …
What are vector quantities? Give three examples.
Answer
Vector quantities are physical quantities that require both magnitude and direction to be completely expressed. They need unit, numerical value, and direction. Examples: displacement (10 m east), velo…
Define distance and state its characteristics.
Answer
Distance is the total length of path through which a body moves. Characteristics: (1) It is a scalar quantity, (2) It depends on the path followed, (3) It is always positive, (4) S.I. unit is metre (m…
Define displacement and state its characteristics.
Answer
Displacement is the shortest distance from initial to final position of a body, in a specified direction. Characteristics: (1) It is a vector quantity, (2) It does not depend on path, (3) Can be posit…
A boy walks 4 km east, then 3 km north. Find his total distance and displacement.
Answer
Total distance = 4 km + 3 km = 7 km Displacement = √(4² + 3²) = √(16 + 9) = √25 = 5 km Direction: tan θ = 3/4, so θ = 36.9° north of east Displacement = 5 km at 36.9° north of east…
Define speed and write its formula.
Answer
Speed is the rate of change of distance with time. It is the distance travelled per unit time. Formula: Speed = Distance/Time or v = S/t Unit: m/s (SI), cm/s (CGS) Speed is a scalar quantity and is al…
Define velocity and write its formula.
Answer
Velocity is the rate of change of displacement with time. It is displacement per unit time in a specified direction. Formula: Velocity = Displacement/Time or v = s/t Unit: m/s (SI), cm/s (CGS) Velocit…
What is the difference between uniform and non-uniform speed?
Answer
Uniform speed: A body covers equal distances in equal intervals of time. Example: Ball rolling on frictionless surface. Non-uniform speed: A body covers unequal distances in equal intervals of time.
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