Class 9 Exam > Class 9 Questions > Find the incorrect statementa)When a body mov...
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Find the incorrect statement
- a)When a body moves with constant speed its acceleration is zero
- b)The body is said to be accelerating if it moves in a uniform circular motion
- c)The slope of velocity-time graph gives instantaneous acceleration
- d)None of these.
Correct answer is option 'A'. Can you explain this answer?
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Find the incorrect statementa)When a body moves with constant speed it...
When a body moves with constant speed its acceleration is not acting. The body is said to be accelerating if it moves in a uniform circular motion. The slope of velocity-time graph gives instantaneous acceleration.
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Find the incorrect statementa)When a body moves with constant speed it...
Understanding Motion and Acceleration
When analyzing the concepts of motion, speed, and acceleration, it's essential to understand the definitions and relationships between these terms.
Statement A: Constant Speed and Acceleration
- **Incorrectness**: The assertion that "when a body moves with constant speed, its acceleration is zero" is misleading.
- **Key Insight**: A body can have constant speed but still be accelerating if its direction is changing.
- **Example**: An object moving in a circular path at a constant speed is a perfect illustration. Although its speed remains the same, the continuous change in direction means it is experiencing centripetal acceleration.
Statement B: Uniform Circular Motion
- **Correctness**: The statement that "the body is said to be accelerating if it moves in a uniform circular motion" is accurate.
- **Key Insight**: In uniform circular motion, the direction changes continuously, resulting in an acceleration directed towards the center of the circle, known as centripetal acceleration.
Statement C: Velocity-Time Graph
- **Correctness**: The statement that "the slope of a velocity-time graph gives instantaneous acceleration" is also true.
- **Key Insight**: The slope of the graph reflects the rate of change of velocity with respect to time, which defines acceleration.
Conclusion
- **Final Note**: Therefore, statement A is incorrect because it fails to recognize that constant speed does not imply zero acceleration if the direction of motion is changing. Understanding these principles is fundamental for mastering the concepts of motion in physics.
When analyzing the concepts of motion, speed, and acceleration, it's essential to understand the definitions and relationships between these terms.
Statement A: Constant Speed and Acceleration
- **Incorrectness**: The assertion that "when a body moves with constant speed, its acceleration is zero" is misleading.
- **Key Insight**: A body can have constant speed but still be accelerating if its direction is changing.
- **Example**: An object moving in a circular path at a constant speed is a perfect illustration. Although its speed remains the same, the continuous change in direction means it is experiencing centripetal acceleration.
Statement B: Uniform Circular Motion
- **Correctness**: The statement that "the body is said to be accelerating if it moves in a uniform circular motion" is accurate.
- **Key Insight**: In uniform circular motion, the direction changes continuously, resulting in an acceleration directed towards the center of the circle, known as centripetal acceleration.
Statement C: Velocity-Time Graph
- **Correctness**: The statement that "the slope of a velocity-time graph gives instantaneous acceleration" is also true.
- **Key Insight**: The slope of the graph reflects the rate of change of velocity with respect to time, which defines acceleration.
Conclusion
- **Final Note**: Therefore, statement A is incorrect because it fails to recognize that constant speed does not imply zero acceleration if the direction of motion is changing. Understanding these principles is fundamental for mastering the concepts of motion in physics.
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Find the incorrect statementa)When a body moves with constant speed its acceleration is zerob)The body is said to be accelerating if it moves in a uniform circular motionc)The slope of velocity-time graph gives instantaneous accelerationd)None of these.Correct answer is option 'A'. Can you explain this answer?
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