Free Fall and Terminal Velocity in a Uniform Gravitational Field
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Questions and Answers

What does a negative gradient in a distance-time graph indicate?

  • Stationary
  • Acceleration
  • Returning back to the starting point (correct)
  • Deceleration
  • In a velocity-time graph, what does a horizontal line represent?

  • Deceleration
  • Constant speed (correct)
  • Acceleration
  • Zero velocity
  • What does a curved line in a distance-time graph signify?

  • Velocity is changing (correct)
  • Acceleration
  • Constant speed
  • Deceleration
  • What is the effect of friction between two surfaces?

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

    To find the resultant of forces acting along the same line, what should you do if they are in opposite directions?

    <p>Subtract them</p> Signup and view all the answers

    What happens to the acceleration of a body falling in a uniform gravitational field as it approaches terminal velocity?

    <p>It decreases</p> Signup and view all the answers

    According to Newton’s first law, what happens to an object's velocity if no resultant force acts on it?

    <p>It remains constant</p> Signup and view all the answers

    What is the term used to describe the distance travelled between realizing the need to brake and actually pressing the brakes?

    <p>Thinking distance</p> Signup and view all the answers

    What contributes to an increase in the thinking distance of a driver when they notice a hazard?

    <p>Greater speed</p> Signup and view all the answers

    When does a body falling in a uniform gravitational field reach terminal velocity?

    <p>When air resistance balances out the weight force</p> Signup and view all the answers

    What causes an increase in the stopping distance of a vehicle?

    <p>Worn brake pads</p> Signup and view all the answers

    Which force is responsible for potentially changing the size and shape of a body?

    <p>Applied force</p> Signup and view all the answers

    What is acceleration?

    <p>The change in velocity per unit time</p> Signup and view all the answers

    Which of the following is true about terminal velocity?

    <p>It is reached when the weight of the object equals the air resistance</p> Signup and view all the answers

    What is the braking distance of a car primarily dependent on?

    <p>The initial speed of the car</p> Signup and view all the answers

    What does deformation refer to?

    <p>The change in shape due to an applied force</p> Signup and view all the answers

    What is thinking distance related to in terms of braking?

    <p>How quickly the driver reacts to a situation</p> Signup and view all the answers

    In which units is acceleration typically measured?

    <p>Metres per second squared (m/s^2)</p> Signup and view all the answers

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