Reta 2. The force of gravity between two objects becomes stronger/twice as strong) LAWS OF MOTION 99 if the distance between them is halved. (four times 3. The force of gravity is weaker on the moon than on earth because the moon has less 4. The gravitational force exerted by the earth on an object is called the object's (Analysis) (mass/distance) (Application) (weight/mass) (Understanding) ANSWERS 1. decreases 2. four times stronger 3. mass 4. weight. Numericals Find the gravitational force between two bodies of masses 50 kg each, situated at 1 m from each other. Ans. 1.67 x 107 N. 2. Find the attractive force between moon and earth if mass of earth is 6 x 1024 kg, mass of moon is 7.4 × 1022 kg and moon is at a distance of 3.84 x 108 m from the earth. Ans. 2.01 x 1020 N. 3. How does the gravitational force between two bodies change, if the distance between them is reduced to half? Calculate the value of 'g' at height of 3 times to radius of earth. Ans. 4 times. Ans. g/16. Ans. 60 kg. wt. 5. Weight of a man on surface of moon is 10 kg. wt. Find weight of man on earth (ge = 6 g). 6. What would happen to acceleration due to gravity if earth is reduced in the radius by one-fourth? Calculate the gravitational force between two persons of mass 60 kg and 80 kg separated by 2 m apart. Write the approximate weight of a man of 10 kg. If weight of a body is 98 N, what is its mass? A man weighs 1200 N on earth. What would be his approximate weight on moon? - A ball is dropped freely from a height and reaches to ground in 3 sec (g= 10 ms²). Find: (i) the height from where ball was dropped. (i) the velocity of ball at the time of hitting the ground. vertically upwards with a speed of 20 ms Ans. 16 times. Ans. 8.004 x 108 N. Ans. 98 N. Ans. 10 kg Ans. 200 M Ans. 45 m, 30 ms How high will it be after 2 sec? (g- 10 ms-2)
Reta 2. The force of gravity between two objects becomes stronger/twice as strong) LAWS OF MOTION 99 if the distance between them is halved. (four times 3. The force of gravity is weaker on the moon than on earth because the moon has less 4. The gravitational force exerted by the earth on an object is called the object's (Analysis) (mass/distance) (Application) (weight/mass) (Understanding) ANSWERS 1. decreases 2. four times stronger 3. mass 4. weight. Numericals Find the gravitational force between two bodies of masses 50 kg each, situated at 1 m from each other. Ans. 1.67 x 107 N. 2. Find the attractive force between moon and earth if mass of earth is 6 x 1024 kg, mass of moon is 7.4 × 1022 kg and moon is at a distance of 3.84 x 108 m from the earth. Ans. 2.01 x 1020 N. 3. How does the gravitational force between two bodies change, if the distance between them is reduced to half? Calculate the value of 'g' at height of 3 times to radius of earth. Ans. 4 times. Ans. g/16. Ans. 60 kg. wt. 5. Weight of a man on surface of moon is 10 kg. wt. Find weight of man on earth (ge = 6 g). 6. What would happen to acceleration due to gravity if earth is reduced in the radius by one-fourth? Calculate the gravitational force between two persons of mass 60 kg and 80 kg separated by 2 m apart. Write the approximate weight of a man of 10 kg. If weight of a body is 98 N, what is its mass? A man weighs 1200 N on earth. What would be his approximate weight on moon? - A ball is dropped freely from a height and reaches to ground in 3 sec (g= 10 ms²). Find: (i) the height from where ball was dropped. (i) the velocity of ball at the time of hitting the ground. vertically upwards with a speed of 20 ms Ans. 16 times. Ans. 8.004 x 108 N. Ans. 98 N. Ans. 10 kg Ans. 200 M Ans. 45 m, 30 ms How high will it be after 2 sec? (g- 10 ms-2)
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Transcribed Image Text:Reta
2. The force of gravity between two objects becomes
stronger/twice as strong)
LAWS OF MOTION
99
if the distance between them is halved. (four times
3. The force of gravity is weaker on the moon than on earth because the moon has less
4. The gravitational force exerted by the earth on an object is called the object's
(Analysis)
(mass/distance)
(Application)
(weight/mass)
(Understanding)
ANSWERS
1. decreases
2. four times stronger
3. mass
4. weight.
Numericals
Find the gravitational force between two bodies of masses 50 kg each, situated at 1 m from each other.
Ans. 1.67 x 107 N.
2. Find the attractive force between moon and earth if mass of earth is 6 x 1024 kg, mass of moon is 7.4 × 1022 kg and
moon is at a distance of 3.84 x 108 m from the earth.
Ans. 2.01 x 1020 N.
3. How does the gravitational force between two bodies change, if the distance between them is reduced to half?
Calculate the value of 'g' at height of 3 times to radius of earth.
Ans. 4 times.
Ans. g/16.
Ans. 60 kg. wt.
5. Weight of a man on surface of moon is 10 kg. wt. Find weight of man on earth (ge = 6 g).
6. What would happen to acceleration due to gravity if earth is reduced in the radius by one-fourth?
Calculate the gravitational force between two persons of mass 60 kg and 80 kg separated by 2 m apart.
Write the approximate weight of a man of 10 kg.
If weight of a body is 98 N, what is its mass?
A man weighs 1200 N on earth. What would be his approximate weight on moon?
- A ball is dropped freely from a height and reaches to ground in 3 sec (g= 10 ms²). Find:
(i) the height from where ball was dropped.
(i) the velocity of ball at the time of hitting the ground.
vertically upwards with a speed of 20 ms
Ans. 16 times.
Ans. 8.004 x 108 N.
Ans. 98 N.
Ans. 10 kg
Ans. 200 M
Ans. 45 m, 30 ms
How high will it be after 2 sec? (g- 10 ms-2)
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