Q. If a satellite's speed is less than the required orbital speed, what will happen?
A.
It will remain in orbit.
B.
It will fall back to Earth.
C.
It will escape into space.
D.
It will move to a higher orbit.
Solution
If a satellite's speed is less than the required orbital speed, it will not have enough centripetal force to maintain its orbit and will fall back to Earth.
Q. If the distance from the center of the Earth is doubled, what happens to the gravitational field strength?
A.
It doubles.
B.
It halves.
C.
It becomes one-fourth.
D.
It becomes zero.
Solution
The gravitational field strength varies inversely with the square of the distance from the center of the Earth, so if the distance is doubled, the field strength becomes one-fourth.
Q. If the Earth were to suddenly shrink to half its radius while keeping its mass constant, what would happen to the gravitational force at its surface?
A.
It would remain the same
B.
It would double
C.
It would become half
D.
It would become four times stronger
Solution
If the radius is halved, the gravitational force increases by a factor of 4, since F = GM/R^2.
Correct Answer:
D
— It would become four times stronger
Q. If the Earth were to suddenly shrink to half its radius while keeping its mass constant, what would happen to the gravitational acceleration at its surface?
A.
It would double
B.
It would remain the same
C.
It would halve
D.
It would quadruple
Solution
If the radius is halved, the gravitational acceleration would increase by a factor of 4 (g ∝ 1/R²).
Gravitation is a fundamental concept in physics that plays a crucial role in various examinations. Understanding gravitation not only enhances your conceptual clarity but also significantly boosts your performance in exams. Practicing MCQs and objective questions on gravitation helps you identify important questions and strengthens your exam preparation, ensuring you are well-equipped to tackle any challenge.
What You Will Practise Here
Newton's Law of Universal Gravitation
Gravitational Force and its Calculation
Acceleration due to Gravity
Gravitational Potential Energy
Orbital Motion and Satellites
Kepler's Laws of Planetary Motion
Concept of Weightlessness
Exam Relevance
The topic of gravitation is frequently featured in CBSE, State Boards, NEET, and JEE examinations. Students can expect questions that assess their understanding of gravitational concepts, calculations involving gravitational force, and applications of Kepler's laws. Common question patterns include numerical problems, conceptual explanations, and diagram-based questions, making it essential to have a strong grasp of this topic.
Common Mistakes Students Make
Confusing mass with weight and not understanding their relationship.
Misapplying the formula for gravitational force in different contexts.
Overlooking the significance of the distance between objects in gravitational calculations.
Failing to interpret the implications of gravitational potential energy correctly.
FAQs
Question: What is the formula for gravitational force? Answer: The formula for gravitational force is F = G(m1*m2)/r², where G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between their centers.
Question: How does gravity affect satellite motion? Answer: Gravity provides the necessary centripetal force that keeps satellites in orbit around planets, balancing the gravitational pull and the satellite's inertia.
Now is the time to enhance your understanding of gravitation! Dive into our practice MCQs and test your knowledge to excel in your exams. Remember, consistent practice is the key to mastering important gravitation questions for exams!
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