Physics: Gravitational Potential Energy and Momentum
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Questions and Answers

If a rock is thrown horizontally from the top of a cliff, what is the direction of the acceleration?

  • horizontally
  • upwards
  • zero
  • downwards (correct)

    • What is the primary force responsible for a projectile's vertical motion?

  • gravity (correct)
  • horizontal velocity
  • air resistance
  • buoyancy

    • A hot air balloon enthusiast throws a grapefruit with a horizontal initial velocity. What is the acceleration of the grapefruit?

  • downwards due to gravity (correct)
  • 水平direction
  • zero
  • upwards due to buoyancy

    • A motorbike traveling with an initial velocity is brought to rest by applying a brake. What is the nature of this process?

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

    What is the effect of a net upward force on an object's velocity?

    <p>it increases the velocity</p> Signup and view all the answers

    What can be calculated by multiplying an object's mass by its velocity?

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

    A ball is launched with an initial velocity at an angle above the horizontal. What is the direction of the acceleration?

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

    What is the horizontal component of a ball's velocity if it is launched at an angle?

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

    A car travels west with a momentum of -30,000 kg.m/s. What is the direction of its velocity?

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

    What is the primary force responsible for an object's vertical displacement?

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

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