5 Gravitational force Weight – Problems and Solutions
1. дегеніміз не ауырлық күші acting on an object at the Earth’s surface? Earth’s масса = 5.98 х 1024 kg, object’s mass = 1000 kg, the radius of the Earth is 6.38 x 106 m.
Белгілі:
Earth’s mass (mE) = 5.98 x 1024 kg
Object’s mass (mo) = 1000 кг
The radius of the Earth (rE) = 6.38 x 106 m
Universal constant (G) = 6.67 x 10-11 Нм2 / кг2
Ауырлық күшінің әсерінен үдеу (g) = 9.8 м/с2
Қажетті: the force of gravity
Шешімі:
![]()
w = weight, F = force, G = universal constant, mE = Earth’s mass, мo = оbject’s mass, r = the distance between the Earth’s center and object.
The object is at the surface of the Earth, so r = the radius of the Earth

Object’s weight (Ньютонның екінші қозғалыс заңы):
w = мг
w = (1000 кг)(9.8 м/с)2)
w = 9800 N
2. What is the force of gravity acting on an object at 10,000 meters above the Earth’s surface ? Earth’s mass = 5.98 x 1024 kg, object’s mass = 1000 kg, the radius of the Earth is 6.38 x 106 m.
Шешімі:

3. The weight of a spacecraft is w. If D = Earth’s diameter, determine the weight of spacecraft when the spacecraft is at 2D above the Earth’s surface.
Белгілі:
D = Earth’s diameter,
R = the radius of the Earth
1 D = 2 R, 2 D = 4 R
Қалаған: spacecraft’s weight at 2D above the Earth’s surface?
Шешімі:

4. The ratio of the mass of the planet A and planet B is 2 : 3, while the ratio of the radius of the planet A and planet B is 1 : 2. If the weight of an object on planet A is w, what is the weight of the object on the planet B.
Белгілі:
Mass of planet A (mA) = 2
Mass of planet B (mB) = 3
Radius of the planet A (rA) = 1
Radius of planet B (rB) = 2
Mass of object = m
Object’s weight on planet A = w
Қалаған: Object’s weight on planet B
Шешімі:
The equation of the force of weight from Newton’s law of gravity :
![]()
w = weight, G = gravitational constant, M = mass of planet, m = mass of object, r = the distance between object and planet. If the object on the planet surface the r = radius of the planet.
Object’s weight on planet A :

Object’s weight on planet B :

Object’s mass is same so that substitute m with w/2G.

5. A rocket with the weight of w launched vertically from the surface of the Earth. D is the diameter of the Earth. When rocket at the height of 0.5 D above the surface of the Earth, then what is the weight of the rocket.
Белгілі:
Rocket’s weight = w
The radius of Earth = distance from the center of Earth = R
Diameter of Earth = D = 2R
Қалаған: Weight of rocket when the rocket at the height of 0.5 D above the Earth surface.
Шешімі:
0.5 D = 0.5 (2R) = R
The distance of rocket from the center of Earth = radius of Earth + radius of a rocket from the surface of Earth = R + R = 2R
Weight is the force of gravity that acts on an object. The force of gravity (F) is inversely proportional to the square of the distance from the center of the earth (R) so that the weight is inversely proportional to the square of the distance.

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