Physics Chapter on Speed
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Questions and Answers

How is speed defined in physics?

  • The time taken to cover a certain distance.
  • The force applied on an object during motion.
  • The distance covered in a specific direction.
  • The ratio of distance to time. (correct)

    • What is the speed of a person who runs 100 meters in 20 seconds?

  • 15 meters per second
  • 2 meters per second
  • 5 meters per second (correct)
  • 10 meters per second

    • What is the unit of measurement commonly used for speed?

  • Liters per minute
  • Meters squared
  • Meters per second (correct)
  • Kilograms per hour

    • If a car travels 300 km in 2 hours, what is its average speed?

    <p>150 km/h</p> Signup and view all the answers

    Which formula is used to calculate average speed?

    <p>speed = \frac{distance}{time}</p> Signup and view all the answers

    What is the formula for calculating speed?

    <p>Speed = Distance / Time</p> Signup and view all the answers

    If a car travels 150 km in 2 hours, what is its speed?

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

    How fast does an airplane travel according to the provided table?

    <p>33 m/s</p> Signup and view all the answers

    Which unit is appropriate for measuring speed in kilometers per hour (km/h)?

    <p>Distance in kilometers and time in hours</p> Signup and view all the answers

    What is the speed of a runner who covers 100 meters in 19 seconds?

    <p>5.26 m/s</p> Signup and view all the answers

    What does accuracy in time measurement refer to?

    <p>How close a measured value is to the actual value.</p> Signup and view all the answers

    What is the significance of using three significant figures in time measurements?

    <p>It maintains enough precision to distinguish very close results.</p> Signup and view all the answers

    Which factor influences the accuracy of time measurements during a sprint?

    <p>Reaction time of the participant.</p> Signup and view all the answers

    How do automated methods improve time measurement accuracy in a laboratory?

    <p>They activate timers based on object detection.</p> Signup and view all the answers

    In what context is it particularly important to consider the accuracy of time measurement?

    <p>High-stakes sprinting competitions.</p> Signup and view all the answers

    What does a horizontal line on a distance-time graph indicate?

    <p>The object is stationary.</p> Signup and view all the answers

    What can be inferred if the slope of the line on a distance-time graph is steep?

    <p>The object has a high speed.</p> Signup and view all the answers

    How does a straight line on a distance-time graph relate to speed?

    <p>Indicates that speed is constant.</p> Signup and view all the answers

    What happens to the slope of the distance-time graph if the speed of the object decreases?

    <p>The slope becomes shallower.</p> Signup and view all the answers

    In what scenario would the distance-time graph show a complete stop in movement?

    <p>As the line is horizontal.</p> Signup and view all the answers

    What does a horizontal line on a distance-time graph represent?

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

    Which of the following indicates a changing speed on a distance-time graph?

    <p>A curved line</p> Signup and view all the answers

    When an object's speed is constant, how is this depicted on a distance-time graph?

    <p>By a straight line</p> Signup and view all the answers

    If the slope of a distance-time graph becomes steeper, what does this indicate about the object's motion?

    <p>The object is accelerating</p> Signup and view all the answers

    Which scenario would produce a straight line on a distance-time graph?

    <p>An object moving at a steady pace</p> Signup and view all the answers

    How can the average speed be calculated from a distance-time graph?

    <p>By dividing distance by time</p> Signup and view all the answers

    What type of line on a distance-time graph suggests that the object is at rest?

    <p>A flat horizontal line</p> Signup and view all the answers

    If a distance-time graph shows a line that is less steep over time, what can be inferred?

    <p>The object is decelerating</p> Signup and view all the answers

    What is the primary advantage of using photoelectric gates for time measurement?

    <p>They provide more accuracy for short time intervals.</p> Signup and view all the answers

    Which of the following terms best describes the consistency of repeated measurements?

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

    How does reaction time affect the measurement of time intervals?

    <p>It can skew the results, especially in short intervals.</p> Signup and view all the answers

    In the formula $v=\frac{l}{t}$, what does the variable $l$ represent?

    <p>Length or distance traveled</p> Signup and view all the answers

    What type of instrument is a chronometer?

    <p>A traditional instrument for timing events</p> Signup and view all the answers

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