Gr 10 Physical Sciences Ch 16: Instantaneous velocity and speed
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Questions and Answers

What is the unit of instantaneous velocity?

  • Metre per second (m·s⁻¹) (correct)
  • Kilogram per second (kg·s⁻¹)
  • Metre per second squared (m·s⁻²)
  • Joule per second (J·s⁻¹)

    • What is the difference between instantaneous velocity and instantaneous speed?

  • Instantaneous velocity is a scalar, while instantaneous speed is a vector.
  • Instantaneous velocity is a vector, while instantaneous speed is a scalar. (correct)
  • Instantaneous velocity is always positive, while instantaneous speed is always negative.
  • Instantaneous velocity is the rate of change of position, while instantaneous speed is the rate of change of distance.

    • What is the formula for instantaneous velocity?

  • v = Δx / Δt
  • v = Δx / Δt²
  • v = 1 / (Δt / Δx)
  • v = lim(Δt → 0) Δx / Δt (correct)

    • Why is it important to distinguish between an instant in time and a time interval?

    <p>Because instantaneous velocity can vary significantly over short intervals.</p> Signup and view all the answers

    What is the difference between instantaneous velocity and average velocity?

    <p>Instantaneous velocity is the velocity at a specific instant in time, while average velocity is the velocity over a time interval.</p> Signup and view all the answers

    What is the definition of instantaneous speed?

    <p>The magnitude of the instantaneous velocity.</p> Signup and view all the answers

    What is the characteristic of instantaneous velocity that is not present in instantaneous speed?

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

    In what type of scenario does instantaneous velocity vary significantly over short intervals?

    <p>When an object is accelerating or decelerating.</p> Signup and view all the answers

    What is the primary purpose of understanding instantaneous velocity and speed?

    <p>To accurately describe motion, especially when velocity varies over time</p> Signup and view all the answers

    What can be inferred about an object's motion if its instantaneous velocity is changing?

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

    Why is instantaneous velocity a vector quantity?

    <p>Because it has both magnitude and direction</p> Signup and view all the answers

    What is an example of a scenario where instantaneous velocity can vary significantly over short intervals?

    <p>A sprinter accelerating at the start of a race</p> Signup and view all the answers

    What is the relationship between instantaneous speed and instantaneous velocity?

    <p>Instantaneous speed is the magnitude of instantaneous velocity</p> Signup and view all the answers

    When is instantaneous velocity most relevant?

    <p>When describing motion at a specific instant in time</p> Signup and view all the answers

    What is a key characteristic of instantaneous velocity that distinguishes it from average velocity?

    <p>It can vary significantly over short intervals</p> Signup and view all the answers

    Why is it essential to consider instantaneous velocity and speed when analyzing motion?

    <p>To accurately describe motion, especially when velocity varies over time</p> Signup and view all the answers

    What does instantaneous velocity represent?

    <p>The rate of change of position at a specific instant in time</p> Signup and view all the answers

    Why is it essential to consider instantaneous velocity when analyzing motion?

    <p>Because it provides a snapshot of an object's motion at a specific instant in time</p> Signup and view all the answers

    What is the primary difference between instantaneous velocity and instantaneous speed?

    <p>Instantaneous velocity has direction, while instantaneous speed does not</p> Signup and view all the answers

    In what type of scenario would an object's instantaneous velocity be constant?

    <p>When the object is moving at a constant speed</p> Signup and view all the answers

    What can be inferred about an object's motion if its instantaneous velocity is zero?

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

    Why is it important to distinguish between instantaneous velocity and average velocity?

    <p>Because instantaneous velocity varies significantly over short intervals, while average velocity does not</p> Signup and view all the answers

    What is the relationship between the magnitude of instantaneous velocity and instantaneous speed?

    <p>Instantaneous speed is equal to the magnitude of instantaneous velocity</p> Signup and view all the answers

    When is instantaneous velocity most relevant in describing an object's motion?

    <p>When the object is accelerating or decelerating</p> Signup and view all the answers

    What is a characteristic of instantaneous velocity that distinguishes it from other types of velocity?

    <p>It represents the rate of change of position at a specific instant</p> Signup and view all the answers

    What is the primary reason why instantaneous velocity might vary significantly over short intervals?

    <p>Due to changes in the object's acceleration or deceleration</p> Signup and view all the answers

    What is a key difference between instantaneous velocity and speed?

    <p>Instantaneous velocity is a vector quantity, while speed is a scalar quantity</p> Signup and view all the answers

    What is a scenario where instantaneous velocity is particularly relevant?

    <p>When an object is accelerating or decelerating</p> Signup and view all the answers

    What is the effect of an object's acceleration on its instantaneous velocity?

    <p>It increases the object's instantaneous velocity</p> Signup and view all the answers

    What is the relationship between the magnitude of instantaneous velocity and instantaneous speed?

    <p>The magnitude of instantaneous velocity is equal to instantaneous speed</p> Signup and view all the answers

    What is the significance of considering instantaneous velocity when analyzing motion?

    <p>It provides a snapshot of the object's motion at a specific instant</p> Signup and view all the answers

    What is a key distinction between instantaneous velocity and average velocity?

    <p>Instantaneous velocity represents the rate of change of position over a specific time interval, while average velocity represents the rate of change of position over the entire time interval</p> Signup and view all the answers

    What is the primary factor that contributes to the difference between instantaneous velocity and average velocity?

    <p>Time interval considered</p> Signup and view all the answers

    If an object's instantaneous velocity is constant, what can be inferred about its motion?

    <p>It is moving in a straight line</p> Signup and view all the answers

    Why is it crucial to understand instantaneous velocity and speed in describing motion?

    <p>To accurately describe the object's motion, especially when velocity varies over time</p> Signup and view all the answers

    What is the relationship between instantaneous velocity and instantaneous speed?

    <p>Instantaneous speed is the magnitude of instantaneous velocity</p> Signup and view all the answers

    In which scenario would an object's instantaneous velocity be most relevant?

    <p>When the object's velocity is increasing or decreasing rapidly</p> Signup and view all the answers

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