Motion and Speed
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Questions and Answers

What is the unit of speed in the speedometer shown in Fig. 13.7?

  • m/h
  • km/m
  • m/s
  • km/h (correct)

    • If a car travels at a speed of 40 km/h, how long will it take to cover a distance of 120 km?

  • 2 hours
  • 4 hours (correct)
  • 3 hours
  • 5 hours

    • Which of the following is an example of speed in everyday life?

  • A planet orbiting the sun
  • A stone rolling down a hill
  • A rabbit running in a forest
  • A car moving on a highway (correct)

    • What is the speed of a falcon in m/s, according to Table 13.4?

    <p>89 m/s</p> Signup and view all the answers

    What is the factor that affects the speed of an object, according to the content?

    <p>None of the above</p> Signup and view all the answers

    What type of speed is represented by the speed of a blue fish in Table 13.4?

    <p>Speed of an animal</p> Signup and view all the answers

    What determines which object is moving the fastest?

    <p>The distance moved by the object in a given interval of time</p> Signup and view all the answers

    What is the unit of speed that is commonly used?

    <p>Kilometres per hour (km/h)</p> Signup and view all the answers

    What is used to calculate speed?

    <p>Distance divided by time</p> Signup and view all the answers

    What factor affects the speed of an object?

    <p>The force applied to it</p> Signup and view all the answers

    Where is speed commonly experienced in everyday life?

    <p>All of the above</p> Signup and view all the answers

    What is the motion of the earth around the sun an example of?

    <p>Circular motion</p> Signup and view all the answers

    Why can you decide whose speed is the highest?

    <p>Because you know who took the shortest time to cover a certain distance</p> Signup and view all the answers

    What is the term for the amount of distance covered in a given interval of time?

    <p>Speed</p> Signup and view all the answers

    What is the speed of the car if it covers a total distance of 200 km in 4 hours?

    <p>50 km/h</p> Signup and view all the answers

    Why do we usually calculate the average speed of a car?

    <p>Because the car moves with varying speed</p> Signup and view all the answers

    What is the unit of speed in the statement 'the car has a speed of 50 kilometres per hour'?

    <p>kilometres per hour</p> Signup and view all the answers

    Why do we need to measure intervals of time that are much shorter than a day?

    <p>Because we need to measure short intervals in everyday life</p> Signup and view all the answers

    What is the formula to calculate speed?

    <p>Speed = Total distance covered / Total time taken</p> Signup and view all the answers

    What is the term used for the time taken by the earth to complete one revolution of the sun?

    <p>Year</p> Signup and view all the answers

    What is the term used for the time between one sunrise and the next?

    <p>Day</p> Signup and view all the answers

    Why do clocks or watches measure time?

    <p>To measure time intervals</p> Signup and view all the answers

    Study Notes

    Motion and Speed

    • Motion refers to the change in position of an object with respect to time and its surroundings.
    • Examples of motion include a pedal of a bicycle, the earth moving around the sun, a swing, and a pendulum.

    Measuring Speed

    • Speed is the distance covered by an object in a given interval of time.
    • To calculate speed, we divide the total distance covered by the total time taken.
    • Speed = Total Distance Covered ÷ Total Time Taken
    • Distance covered = Speed × Time

    Understanding Speed

    • In everyday life, objects rarely move with a constant speed over long distances or for long durations of time.
    • The speed calculated is actually the average speed of the object.
    • When we say an object has a speed of 50 km/h, we usually mean the total distance covered by it in one hour, regardless of whether it moved with a constant speed or not.

    Measuring Time

    • Clocks and watches are common time-measuring devices used to measure intervals of time that are much shorter than a day.
    • The dashboard of a car, bus, or other vehicle often has a speedometer that records the speed in km/h.

    Speed of Different Animals

    • The table below shows the fastest speed that some animals can attain:
      • Falcon: 320 km/h (320 × 10^0 m/s)
      • Cheetah: 112 km/h
      • Blue fish: 40-46 km/h
      • Rabbit: 56 km/h
      • Squirrel: 19 km/h
      • Domestic mouse: 11 km/h
      • Human: 40 km/h
      • Giant tortoise: 0.27 km/h

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    Description

    Quiz about motion and speed, comparing the speed of different objects and understanding the concept of motion.

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