Motion in one Dimension — Flashcards
ICSE · Class 9 · Physics
34 flashcards for Motion in one Dimension (ICSE Class 9 Physics) to test yourself on key terms and facts. Sample: "What is a scalar quantity?"
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What is a scalar quantity?
Answer
A scalar quantity is a physical quantity expressed only by magnitude. It needs a unit and a numerical value, but no direction. Examples: mass, length, time, distance, speed, work, energy.
What is a vector quantity?
Answer
A vector quantity needs magnitude and direction to be complete. It is expressed using a unit, numerical value, and direction. Examples: displacement, velocity, acceleration, force, momentum, weight.
A body moves 4 km east and then 3 km north. Find the distance travelled and the displacement.
Answer
Given: 4 km east, then 3 km north Distance = 4 km + 3 km = 7 km Displacement forms a right triangle. Displacement = sqrt((4 km)^2 + (3 km)^2) Displacement = sqrt(16 + 9) km = sqrt(25) km = 5 km Answer…
Why is displacement never greater than distance?
Answer
Distance is the total path length travelled, while displacement is the shortest straight-line distance from initial position to final position. A straight line is always the shortest path between two …
A body travels 120 m in 2 s. Find its speed.
Answer
Given: Distance S = 120 m, Time t = 2 s Formula: v = S / t Step 1: v = 120 m / 2 s Step 2: v = 60 m/s Answer: 60 m/s…
State the formula for speed and its SI unit.
Answer
Formula: v = S / t Here, v = speed, S = distance, t = time SI unit of speed = m/s CGS unit of speed = cm/s…
A body moves with uniform speed 20 m/s for 5 minutes. Find the distance travelled.
Answer
Given: speed v = 20 m/s, time t = 5 min = 300 s Formula: S = v t Step 1: S = 20 m/s × 300 s Step 2: S = 6000 m Step 3: S = 6 km Answer: 6000 m or 6 km…
What is uniform speed?
Answer
A body is said to be moving with uniform speed if it covers equal distances in equal intervals of time throughout its motion. A ball on a frictionless plane surface is an example.
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