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प्रश्न
Read the statement below carefully and state, with reason and example, if it is true or false:
A particle in one-dimensional motion with zero speed at an instant may have non-zero acceleration at that instant
विकल्प
True
False
उत्तर
This statement is True.
Explanation:
When an object is thrown vertically up in the air, its speed becomes zero at its maximum height. However, it has acceleration equal to the acceleration due to gravity (g) that acts in the downward direction at that point.
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संबंधित प्रश्न
In the following examples of motion, can the body be considered approximately a point object:
A railway carriage moving without jerks between two stations.
A drunkard walking in a narrow lane takes 5 steps forward and 3 steps backward, followed again by 5 steps forward and 3 steps backward, and so on. Each step is 1 m long and requires 1 s. Plot the x-tgraph of his motion. Determine graphically and otherwise how long the drunkard takes to fall in a pit 13 m away from the start.
Explain clearly, with examples, the distinction between:
- magnitude of displacement (sometimes called distance) over an interval of time, and the total length of path covered by a particle over the same interval.
- magnitude of average velocity over an interval of time, and the average speed over the same interval. [Average speed of a particle over an interval of time is defined as the total path length divided by the time interval]. Show in both (a) and (b) that the second quantity is either greater than or equal to the first. When is the equality sign true ? [For simplicity, consider one-dimensional motion only].
Look at the graph carefully and state, with reason, that this cannot possibly represent the one-dimensional motion of a particle.
The numerical ratio of distance to displacement is ______.
An athlete completes one round of a circular track of radius R in 80 sec. What will be his displacement at the end of 4 min 60 seconds?
In the following example of motion, can the body be considered approximately a point object:
A monkey sitting on top of a man cycling smoothly on a circular track.
In the following example of motion, can the body be considered approximately a point object:
A spinning cricket ball that turns sharply on hitting the ground.
Look at the graph carefully and state, with reason, that this cannot possibly represent the one-dimensional motion of a particle.
Look at the graph carefully and state, with reason, that this cannot possibly represent the one-dimensional motion of a particle.
