attracted towards the cen
4. The weight of an object can be zero. For example, in the
interplanetary space, where go, the weight of an object
2. The SI unit of weight is newton (N).
3. The weight of an object is not constant. It changes with
the change in acceleration due to gravity (8)
Before we go further and discuss thrust and pressure, please answer the following questions and
5. Name the scientist who explained the motion of planets on the basis of gravitational force between the sun
object is the quantity of
matter contained in it.
2. The SI unit of mass is kilogram (kg).
3. The mass of an object is constant.
4. The mass of an object can never be zero.
becomes zero.
problems :
Very Short Answer Type Questions
1. What is the value of gravitational constant G (i) on the earth, and (ii) on the moon?
2. Which force is responsible for the moon revolving round the earth?
3. Does the acceleration produced in a freely falling body depend on the mass of the body?
4. Name the scientist who gave the three laws of planetary motion.
and planets.
7. Which of the Kepler's laws of planetary motion Ted Newton to establish the inverse-square rule for
gravitational force between two bodies ?
8. Name the property of earth which is responsible for extremely small acceleration being produced in it as a
result of attraction by other small objects.
9. What is the acceleration produced in a freely falling body of mass 10 kg ? (Neglect air resistance)
10. When an object is dropped from a height, it accelerates and falls down. Name the force which accelerate
the object.
11. Give the formula for the gravitational force F between two bodies of masses M and m kept at a dis
from each other.
12. What force is responsible for the earth revolving round the sun ?
Can anyone give me the answers of 5 to 12
Answers
Answer:
so many questions ...
Explanation:
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4. Weight can be zero when acceleration due to gravity is zero. The value of 'g' is maximum on the surface of the Earth and decreases on going inside the surface or above the surface of the Earth. Thus, the weight of a body will be zero at the centre of the Earth.
2. Newton, absolute unit of force in the International System of Units (SI units), abbreviated N. It is defined as that force necessary to provide a mass of one kilogram with an acceleration of one metre per second per second.
3. Mass is constant for every object. Unless the objects changes, the mass will not change. On the other hand, the weight of an object is subjected to change due to gravity. The weight of an object is the force pulling it to the ground.
5. Sir Isaac Newton
Answer: Sir Isaac Newton explained the motion of planets on the basis of gravitational force between the sun and the planets.
2. The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.62607015×10−34 when expressed in the unit J⋅s, which is equal to kg⋅m2⋅s−1, where the metre and the second are defined in terms of c and ΔνCs.
Unit system: SI base unit
Avoirdupois: ≈ 2.204622 pounds
3. Mass is constant because mass is quantity of matter present in an object and it does not changes with gravity. ... If an object has more mass, then its pull on earth would be greater than an object with less mass, and therefore should fall to earth faster.
4. Whereas on the other hand mass cannot be zero because mass is an intrinsic property and hence it depends upon the object alone and not on other factors. Thus mass of a body cannot be zero.
Explanation:
Very Short Answer Type Questions
1. 9.8 m/s2
In the first equation above, g is referred to as the acceleration of gravity. Its value is 9.8 m/s2 on Earth.
1. 625 m/s2
The acceleration due to gravity on moon or the value of g on moon is 1.625 m/s2.
2. gravitational force
Which force is responsible for the moon revolving round the earth? Answer: The revolution of the moon round the earth is because of gravitational force.
3. No, the acceleration produced in a freely falling body does not depend on the mass of the body.
4. In the early 1600s, Johannes Kepler proposed three laws of planetary motion. Kepler was able to summarize the carefully collected data of his mentor - Tycho Brahe - with three statements that described the motion of planets in a sun-centered solar system.
7. Kepler's third law of planetary motion led Newton to establish the inverse -square rule for gravitational force between two bodies.
8. Extremely large mass of the earth is responsible for extremely small acceleration that is produced in small objects.
9. The acceleration produced in a freely falling body of mass 10kg is 9.8 m/s2.
10. Gravitational force
When an object is dropped from a height ,it accelerates when it falls down. Gravitational force accelerates the object.
11. g = GM/r2, Where M is the mass of the Earth, r the radius of the Earth (or distance between the center of the Earth and you, standing on its surface), and G is the gravitational constant. G (without the subscripts) is the gravitational constant, and c is the speed of light.
12. gravity
First, gravity is the force that pulls us to the surface of the Earth, keeps the planets in orbit around the Sun and causes the formation of planets, stars and galaxies.
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