Objects at Rest and in Motion / āϏā§āĻĨāĻŋā§° āĻā§°ā§ āĻāϤāĻŋāϤ āĻĨāĻāĻž āĻŦāϏā§āϤā§
Definition / āϏāĻāĻā§āĻāĻž
Objects at Rest / āϏā§āĻĨāĻŋā§° āĻŦāϏā§āϤ⧠: An object at REST does not change its position with time. (āϏā§āĻĨāĻŋā§° (Rest) āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻĨāĻāĻž āĻŦāϏā§āϤā§ā§ąā§ āϏāĻŽāϝāĻŧā§° āϞāĻā§ āϞāĻā§ āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§āĨ¤)
Objects in Motion / āĻāϤāĻŋāϤ āĻĨāĻāĻž āĻŦāϏā§āϤ⧠: An object in MOTION changes its position with time. (āĻāϤāĻŋ (Motion)**āϤ āĻĨāĻāĻž āĻŦāϏā§āϤā§ā§ąā§ āϏāĻŽāϝāĻŧā§° āϞāĻā§ āϞāĻā§ āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°ā§āĨ¤)
Examples / āĻāĻĻāĻžāĻšā§°āĻŖ:
- The book is at rest. The book does not move. (āĻāĻŋāϤāĻžāĻĒāĻāύ āϏā§āĻĨāĻŋā§° āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻāĻā§āĨ¤āĻāĻŋāϤāĻžāĻĒāĻāύ⧠āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§āĨ¤)
- The bicycle is at rest. The bicycle is not moving. (āĻāĻžāĻāĻā§āϞāĻāύ āϏā§āĻĨāĻŋā§° āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻāĻā§āĨ¤ āĻāĻžāĻāĻā§āϞāĻāύ āĻāϞāĻŋ āĻĨāĻāĻž āύāĻžāĻāĨ¤)
- The bus is in motion. The bus is moving from one place to another. (āĻŦāĻžāĻāĻāύ āĻāϤāĻŋāϤ āĻāĻā§āĨ¤ āĻŦāĻžāĻāĻāύ āĻāĻ āĻžāĻā§° āĻĒā§°āĻž āĻāύ āĻ āĻžāĻāϞ⧠āĻā§ āĻāĻā§āĨ¤)
- The child is in motion. The child is walking or running. (āĻļāĻŋāĻļā§āĻāĻŋ āĻāϤāĻŋāϤ āĻāĻā§ āĻļāĻŋāĻļā§āĻāĻŋāϝāĻŧā§ āĻā§āĻ āĻāĻžāĻĸāĻŧāĻŋāĻā§ āĻŦāĻž āĻĻā§ā§°āĻŋ āĻāĻā§āĨ¤)
- The ball is at rest. The ball is not moving. (āĻŦāϞāĻā§ āϏā§āĻĨāĻŋā§° āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻāĻā§āĨ¤ āĻŦāϞāĻā§ āĻāϞāĻŋ āĻĨāĻāĻž āύāĻžāĻāĨ¤)
- The ball is in motion. The ball is rolling or moving. (āĻŦāϞāĻā§ āĻāϤāĻŋāϤ āĻāĻā§āĨ¤ āĻŦāϞāĻā§ āĻā§ā§°āĻŋ āĻā§ āĻāĻā§ āĻŦāĻž āĻāϞāĻŋ āĻāĻā§āĨ¤)
Rest vs Motion / āϏā§āĻĨāĻŋā§°āϤāĻž āĻŦāύāĻžāĻŽ āĻāϤāĻŋ
- Rest (āϏā§āĻĨāĻŋā§°) : No change in position. (āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§āĨ¤)
- Motion (āĻāϤāĻŋ) : Changes position with time. (āϏāĻŽāϝāĻŧā§° āϞāĻā§ āϞāĻā§ āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°ā§āĨ¤)
Real - life Example / āĻŦāĻžāϏā§āĻ¤ā§ą āĻā§ā§ąāύ⧰ āĻāĻĻāĻžāĻšā§°āĻŖ
A chair in the classroom is at rest, but a fan blade is in motion because it rotates. (āĻļā§ā§°ā§āĻŖā§āĻā§āĻ āĻžā§° āĻāĻā§āĻāύ āϏā§āĻĨāĻŋā§° āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻĨāĻžāĻā§, āĻāĻŋāύā§āϤ⧠āĻĢā§āύ⧰ āĻĒāĻžāĻāĻŋ āĻāϤāĻŋāϤ āĻĨāĻžāĻā§, āĻāĻžā§°āĻŖ āĻ āĻā§ā§°āĻŋ āĻĨāĻžāĻā§āĨ¤)
Summary / āϏāĻžā§°āĻžāĻāĻļ
- Rest means no change in position. (āϏā§āĻĨāĻŋā§° (Rest) āĻŽāĻžāύ⧠āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°āĻžāĨ¤)
- Motion means change in position with time. (āĻāϤāĻŋ (Motion) āĻŽāĻžāύ⧠āϏāĻŽāϝāĻŧā§° āϞāĻā§ āϞāĻā§ āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°āĻžāĨ¤)
Note: i. Rest = No Movement = āϏā§āĻĨāĻŋā§° = āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§, ii. Motion = Movement = āĻāϤāĻŋ = āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°ā§
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Objects at Rest and in Motion – PYQs & Expected MCQs :: āϏā§āĻĨāĻŋā§° āĻā§°ā§ āĻāϤāĻŋāϤ āĻĨāĻāĻž āĻŦāϏā§āϤ⧠– PYQs āĻā§°ā§ āϏāĻŽā§āĻāĻžā§ąā§āϝ MCQs
Q1. An object at rest means - āϏā§āĻĨāĻŋā§° āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻĨāĻāĻž āĻŦāϏā§āϤ⧠āĻŽāĻžāύ⧠-
A) It changes its position continuously. | B) It does not change its position with time. | C) It moves very slowly. | D) It rotates continuously.
Ans: B) It does not change its position with time.
Explanation : A body at rest does not change its position with time. āĻŦā§āϝāĻžāĻā§āϝāĻž: Rest āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻĨāĻāĻž āĻŦāϏā§āϤā§ā§ąā§ āϏāĻŽāϝāĻŧā§° āϞāĻā§ āϞāĻā§ āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§āĨ¤
Q2. An object in motion - :: āĻāϤāĻŋāϤ āĻĨāĻāĻž āĻŦāϏā§āϤ⧠-
A) Does not move. | B) Changes its position with time. | C) Always remains at one place. | D) Has no force acting on it.
Ans: B) Changes its position with time.
Explanation: A body is in motion if its position changes with time. āĻŦā§āϝāĻžāĻā§āϝāĻž: Motion āĻŽāĻžāύ⧠āϏāĻŽāϝāĻŧā§° āϞāĻā§ āϞāĻā§ āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°āĻžāĨ¤
Q3. Which one is at rest ? āϤāϞ⧰ āĻā§āύāĻā§ āϏā§āĻĨāĻŋā§° āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻāĻā§ ?
A) Flying bird | B) Moving bus | C) Book kept on a table | D) Rolling ball
Ans: C) Book kept on a table.
Explanation: A book placed on a table does not change its position. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻā§āĻŦā§āϞ⧰ āĻāĻĒā§°āϤ āĻĨāĻāĻž āĻāĻŋāϤāĻžāĻĒāĻāύ⧠āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§āĨ¤
Q4. Which one is in motion ? āϤāϞ⧰ āĻā§āύāĻā§ āĻāϤāĻŋāϤ āĻāĻā§ ?
A) Chair in a classroom | B) Parked bicycle | C) Running child | D) Book on a desk
Ans: C) Running child.
Explanation: A running child changes position continuously. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻĻā§ā§°āĻŋ āĻĨāĻāĻž āĻļāĻŋāĻļā§āĻāĻŋāϝāĻŧā§ āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°āĻŋ āĻĨāĻžāĻā§āĨ¤
Q5. A fan blade is an example of - āĻĢā§āύ⧰ āĻĒāĻžāĻāĻŋ āĻāĻŋāĻšā§° āĻāĻĻāĻžāĻšā§°āĻŖ ?
A) Rest | B) Motion | C) Force | D) Energy
Ans: B) Motion.
Explanation: The fan blade rotates, so it is in motion. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻĢā§āύ⧰ āĻĒāĻžāĻāĻŋ āĻā§ā§°āĻŋ āĻĨāĻžāĻā§, āϏā§āϝāĻŧā§ āĻ āĻāϤāĻŋāϤ āĻĨāĻžāĻā§āĨ¤
Q6. A football lying on the ground is in - āĻŽāĻžāĻāĻŋāϤ āĻĒā§°āĻŋ āĻĨāĻāĻž āĻĢā§āĻāĻŦāϞāĻā§ āĻāĻŋ āĻ ā§ąāϏā§āĻĨāĻžāϤ āĻāĻā§ ?
A) Motion | B) Rest | C) Rotation | D) Speed
Ans: B) Rest.
Explanation: The football is not changing its position. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻĢā§āĻāĻŦāϞāĻā§ā§ąā§ āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§āĨ¤
Q7. Which statement is correct ? āĻā§āύāĻā§ āĻŦāĻā§āϤāĻŦā§āϝ āϏāĻ āĻŋāĻ ?
A) Rest means change in position. | B) Motion means no change in position. | C) Motion means change in position with time. | D) Rest means moving slowly.
Ans: C) Motion means change in position with time.
Explanation: Motion is defined as the change in position of an object with time. āĻŦā§āϝāĻžāĻā§āϝāĻž: Motion āĻŽāĻžāύ⧠āϏāĻŽāϝāĻŧā§° āϞāĻā§ āϞāĻā§ āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°āĻžāĨ¤
Q8. A bus travelling from Guwahati to Jorhat is - āĻā§ā§ąāĻžāĻšāĻžāĻā§ā§° āĻĒā§°āĻž āϝā§ā§°āĻšāĻžāĻāϞ⧠āϝā§ā§ąāĻž āĻŦāĻžāĻāĻāύ -
A) At Rest | B) In Motion | C) Stationary | D) None of these
Answer: B) In Motion.
Explanation: The bus is changing its position while travelling. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻŦāĻžāĻāĻāύ āϝāĻžāϤā§ā§°āĻžā§° āϏāĻŽāϝāĻŧāϤ āύāĻŋāĻā§° āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āĻā§°āĻŋ āĻĨāĻžāĻā§āĨ¤
Q9. Which pair is correctly matched ? āĻā§āύāĻā§ āϝā§ā§°āĻž āϏāĻ āĻŋāĻāĻāĻžā§ąā§ āĻŽāĻŋāϞ āĻāĻžāĻāĻā§ ?
A) Rest – Changes position | B) Motion – No movement | C) Rest – No change in position | D) Motion – Fixed position
Ans: C) Rest – No change in position.
Explanation: A body at rest does not change its position. āĻŦā§āϝāĻžāĻā§āϝāĻž: Rest āĻ
ā§ąāϏā§āĻĨāĻžāϤ āĻĨāĻāĻž āĻŦāϏā§āϤā§ā§ąā§ āϏā§āĻĨāĻžāύ āϏāϞāύāĻŋ āύāĻā§°ā§āĨ¤
Q10. A bicycle parked near a school is - āĻŦāĻŋāĻĻā§āϝāĻžāϞāϝāĻŧā§° āĻāĻā§°āϤ ā§°āĻāĻž āĻāĻžāĻāĻā§āϞāĻāύ -
A) In Motion | B) At Rest | C) Rotating | D) Running
Ans: B) At Rest.
Explanation: A parked bicycle is not moving. āĻŦā§āϝāĻžāĻā§āϝāĻž: ā§°āĻāĻžāĻ āĻĨā§ā§ąāĻž āĻāĻžāĻāĻā§āϞāĻāύ āĻāϞāĻŋ āĻĨāĻāĻž āύāĻžāĻ, āϏā§āϝāĻŧā§ āĻ Rest-āϤ āĻāĻā§āĨ¤
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