Motion in one Dimension
ICSE · Class 9 · Physics
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Which of the following is a scalar quantity?
A body is said to be at rest when:
The SI unit of velocity is:
If a body moves 4 km east and then 3 km north, what is the magnitude of displacement?
Sample Questions
Which of the following are vector quantities? (Select all correct answers)
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Displacement, Velocity, Acceleration
Displacement, velocity, and acceleration are vector quantities as they have both magnitude and direction. Speed, distance, and time are scalar quantities with only magnitude.
Speed is 36 km/h. Convert this to m/s:
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10 m/s
To convert km/h to m/s, multiply by 5/18. So 36 km/h = 36 × (5/18) = 10 m/s. Alternatively, 36 km/h = (36 × 1000)/(60 × 60) = 36000/3600 = 10 m/s.
A car travels 200 km in 4 hours. What is its average speed?
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50 km/h
Average speed = Total distance / Total time = 200 km / 4 h = 50 km/h. This is the basic formula for calculating average speed.
The slope of distance-time graph gives:
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Speed
The slope of distance-time graph represents the rate of change of distance with time, which is speed. Speed = distance/time, so slope = rise/run = distance/time = speed.
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