Class 9th Science Chapter 7

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Questions and Answers

What is the SI unit of speed?

  • Centimeters per second (cm/s)
  • Miles per hour (mph)
  • Kilometers per hour (km/h)
  • Meters per second (m/s) (correct)

What is the formula to calculate average speed?

  • Time × Distance
  • Distance ÷ Time (correct)
  • Time ÷ Distance
  • Distance × Time

Which of the following is an example of non-uniform motion?

  • A train moving at a constant speed on a straight track
  • A cyclist accelerating from rest (correct)
  • A pendulum swinging back and forth
  • A car moving at a constant speed on a straight road

Flashcards

What is the SI unit for speed?

The SI unit used to measure how fast something is moving.

How do you calculate average speed?

A formula used to calculate the average rate of movement over a specific distance and time.

What is non-uniform motion?

Motion where an object's speed changes over time, like accelerating or decelerating.

Study Notes

Units of Speed

  • The SI unit of speed is meter per second (m/s)

Calculating Average Speed

  • The formula to calculate average speed is: average speed = total distance / total time taken

Types of Motion

  • Non-uniform motion is exemplified by a car traveling around a circular track, as its velocity changes constantly due to the change in direction

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