Class 7 Exam > Class 7 Questions > Which of the following is not in uniform moti...
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Which of the following is not in uniform motion?
- a)A fan's blade moving at a constant speed
- b)the rotation of earth
- c)a bullet travelling with a constant speed in a straight line.
- d)a swinging pendulum
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is not in uniform motion?a)A fans blade moving ...
**Answer:**
The correct answer is option D, both (a) and (b).
**Explanation:**
Uniform motion is the type of motion in which an object covers equal distances in equal intervals of time. In other words, the object moves at a constant speed in a straight line. Let's analyze each option to determine if it represents uniform motion or not:
a) A swinging pendulum:
A swinging pendulum does not represent uniform motion because its speed is not constant. A pendulum swings back and forth, and its speed changes at each point in its swing. The speed is maximum at the lowest point (the equilibrium position) and decreases as it moves upward. Therefore, a swinging pendulum is not an example of uniform motion.
b) The rotation of the Earth:
The rotation of the Earth does not represent uniform motion because the Earth is not moving at a constant speed in a straight line. The Earth rotates on its axis, completing one rotation in approximately 24 hours. However, the speed of rotation is not constant. The Earth moves faster at the equator and slower at the poles. Therefore, the rotation of the Earth is not an example of uniform motion.
c) A bullet traveling with a constant speed in a straight line:
A bullet traveling with a constant speed in a straight line represents uniform motion. If a bullet is traveling at a constant speed, covering equal distances in equal intervals of time, it is an example of uniform motion.
Therefore, options a and b are not in uniform motion, while option c represents uniform motion. Hence, the correct answer is option D, both (a) and (b).
The correct answer is option D, both (a) and (b).
**Explanation:**
Uniform motion is the type of motion in which an object covers equal distances in equal intervals of time. In other words, the object moves at a constant speed in a straight line. Let's analyze each option to determine if it represents uniform motion or not:
a) A swinging pendulum:
A swinging pendulum does not represent uniform motion because its speed is not constant. A pendulum swings back and forth, and its speed changes at each point in its swing. The speed is maximum at the lowest point (the equilibrium position) and decreases as it moves upward. Therefore, a swinging pendulum is not an example of uniform motion.
b) The rotation of the Earth:
The rotation of the Earth does not represent uniform motion because the Earth is not moving at a constant speed in a straight line. The Earth rotates on its axis, completing one rotation in approximately 24 hours. However, the speed of rotation is not constant. The Earth moves faster at the equator and slower at the poles. Therefore, the rotation of the Earth is not an example of uniform motion.
c) A bullet traveling with a constant speed in a straight line:
A bullet traveling with a constant speed in a straight line represents uniform motion. If a bullet is traveling at a constant speed, covering equal distances in equal intervals of time, it is an example of uniform motion.
Therefore, options a and b are not in uniform motion, while option c represents uniform motion. Hence, the correct answer is option D, both (a) and (b).
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Community Answer
Which of the following is not in uniform motion?a)A fans blade moving ...
No, option D is not the write answer because a, b, c is uniform motions and your question is which is not uniform motion. in these options none of these option is correct.
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Which of the following is not in uniform motion?a)A fans blade moving at a constant speedb)the rotation of earthc)a bullet travelling with a constant speed in a straight line.d)a swinging pendulumCorrect answer is option 'D'. Can you explain this answer?
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