Motion — Flashcards
Gujarat Board · Class 9 · Science
30 flashcards for Motion (Gujarat Board Class 9 Science) to test yourself on key terms and facts. Sample: "What is motion? Give two examples from"
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What is motion? Give two examples from everyday life.
Answer
Motion is the change in position of an object with time. Examples: (1) A car moving on the road, (2) Birds flying in the sky, (3) Blood flowing through veins and arteries, (4) A person walking in the …
Define distance and displacement. How are they different?
Answer
Distance is the total path length covered by an object. It is a scalar quantity (only magnitude). Displacement is the shortest distance measured from initial to final position of an object in a specif…
Can the magnitude of displacement be equal to the distance travelled? When?
Answer
Yes, the magnitude of displacement equals distance only when an object moves in a straight line in one direction without changing its path. In all other cases (curved path, back-and-forth motion), dis…
What is uniform motion? Give an example.
Answer
Uniform motion occurs when an object covers equal distances in equal intervals of time. The speed remains constant throughout the motion. Example: A car traveling at constant 60 km/h on a straight hig…
What is non-uniform motion? Give an example.
Answer
Non-uniform motion occurs when an object covers unequal distances in equal intervals of time. The speed keeps changing throughout the motion. Example: A car moving in city traffic, sometimes fast, som…
Define speed. What is its SI unit and formula?
Answer
Speed is the distance travelled by an object per unit time. It tells us how fast an object is moving. Formula: Speed = Distance/Time or v = s/t. SI unit: metre per second (m/s or ms⁻¹). Other units: k…
What is average speed? How is it calculated?
Answer
Average speed is the total distance travelled divided by the total time taken. It gives the overall rate of motion for the entire journey. Formula: Average speed = Total distance travelled / Total tim…
Define velocity. How is it different from speed?
Answer
Velocity is the speed of an object moving in a definite direction. It is displacement per unit time. Differences from speed: (1) Velocity has direction, speed doesn't, (2) Velocity can be negative, sp…
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