The gravity between two objects increases as the distance between them _. A. decreases C. neutralizes B. increases D. stabilizes 2. Without air resistance, all objects fall at the same rate. A. true C. maybe B. false D. neither true or false 3. Which of these will have the strongest gravitational pull on Earth? A. a baby C. a drinking glass B. a half sack of rice D. an elephant 4. Why is it difficult for us to go up in a mountain than go down? A. We are moving against gravity. B. We are pulled by the wind. C. We are moving towards gravity. D. None of the above 5. Which of the following statements does NOT tell about the effects of gravitational force on objects? A. The more distant the body from the earth, the lesser is the gravitational force of attraction. B. Gravitational force pushes the objects upward. C. Gravitational force is greater when the objects are closer together. D. The farther you are from earth, the lesser your weight.
The Correct Answer and Explanation is:
- The gravity between two objects increases as the distance between them ___.
- Answer: A. decreases
- Explanation: According to Newton’s law of universal gravitation, the gravitational force between two objects is inversely proportional to the square of the distance between them. This means that as the distance between the objects decreases, the force of gravity increases. For example, the gravitational force between the Earth and an object is stronger when the object is closer to the Earth and weaker when it is farther away.
- Without air resistance, all objects fall at the same rate.
- Answer: A. true
- Explanation: This principle was demonstrated by Galileo and is a fundamental concept of physics. In the absence of air resistance, all objects, regardless of their mass or composition, fall at the same acceleration due to gravity (approximately 9.8 m/s² on Earth). This means that a feather and a stone will hit the ground at the same time if dropped from the same height in a vacuum, where air resistance is absent.
- Which of these will have the strongest gravitational pull on Earth?
- Answer: D. an elephant
- Explanation: The gravitational force between two objects depends on their masses and the distance between them. The stronger the mass of an object, the greater its gravitational pull. Among the given options, an elephant has the largest mass, and thus, it exerts the strongest gravitational pull on Earth compared to a baby, drinking glass, or a sack of rice. However, the Earth’s gravity overwhelmingly dominates, so these forces are extremely small in comparison.
- Why is it difficult for us to go up a mountain than go down?
- Answer: A. We are moving against gravity.
- Explanation: When climbing up a mountain, we are moving against the force of gravity, which pulls us downward. This requires more effort because we need to overcome the gravitational pull that is trying to bring us back to the ground. On the other hand, when descending a mountain, gravity assists our movement, making it easier to go downhill. This is why it is typically harder to climb up than to descend.
- Which of the following statements does NOT tell about the effects of gravitational force on objects?
- Answer: B. Gravitational force pushes the objects upward.
- Explanation: Gravitational force always attracts objects towards one another; it never pushes them away. Statement B is incorrect because gravity pulls objects toward the center of the Earth (or any massive object), not upwards. Statements A, C, and D correctly describe the effects of gravitational force. Gravitational force weakens with distance (A), is stronger when objects are closer (C), and weight decreases as you move farther from Earth (D).
