Mechanics (1d - Kinematics)

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Angsh
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  • 1/5 Questions

    A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be

    • Less than the speed it had when thrown upwards.
    • More than the speed it had when thrown upwards.
    • The same as the speed it had when thrown upwards.
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About This Quiz

This quiz covers basic concepts of 1D kinematics, focusing on free fall, projectile motion, and the effects of gravity on motion without air resistance.

Mechanics (1d - Kinematics) - Quiz

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  • 2. 

    Suppose an object is in free fall. Each second the object falls

    • The same distance as in the second before.

    • A larger distance as in the second before.

    • With the same instantaneous speed.

    • With the same average speed

    • None of the above

    Correct Answer
    A. A larger distance as in the second before.
    Explanation
    When an object is in free fall, it accelerates due to gravity. This means that its velocity increases with each passing second. As a result, the object covers a larger distance in the second that follows compared to the second before. Therefore, the correct answer is that the object falls a larger distance as in the second before.

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  • 3. 

    A free falling object is dropped from a height from rest. After falling for 1 second, the speed is about

    • 5m/s

    • 10m/s

    • 100m/s

    • None of the above

    Correct Answer
    A. 10m/s
    Explanation
    When a free falling object is dropped from rest, it accelerates due to gravity. The acceleration due to gravity is approximately 9.8 m/s^2. After falling for 1 second, the object would have reached a velocity of approximately 9.8 m/s. However, due to air resistance, the actual speed may be slightly less than this. Therefore, the closest option is 10m/s.

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  • 4. 

    As an object falls freely in vacuum, its

    • Velocity increases.

    • Acceleration increases

    • Both velocity and acceleration increase.

    • Only distance increases.

    Correct Answer
    A. Velocity increases.
    Explanation
    When an object falls freely in a vacuum, there is no air resistance acting upon it. This means that the only force acting on the object is gravity. According to the laws of physics, when an object is subject to a constant force, it experiences a constant acceleration. In this case, the force of gravity causes the object to accelerate downwards. As the object accelerates, its velocity increases. Therefore, the correct answer is that the velocity of the object increases as it falls freely in a vacuum.

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  • 5. 

    At the highest point of flight of a ball thrown upwards,

    • The acceleration is zero.

    • The acceleration is the minimal.

    • The acceleration is directed downward.

    • The acceleration is directed upward.

    Correct Answer
    A. The acceleration is directed downward.
    Explanation
    At the highest point of flight, the ball has reached its maximum height and is momentarily at rest before it starts to fall back down. At this point, the velocity of the ball is zero, but the acceleration is directed downward due to the force of gravity acting on it. This downward acceleration is responsible for bringing the ball back down to the ground.

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  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 23, 2009
    Quiz Created by
    Angsh
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