Literally tension is the force that is transmitted through any object when it is pulled on both sides. In this perspective momenta is the tension between earth and its nearest objects.

At the center of the earth the acceleration due to gravity is zero. Consequently, gravitational acceleration is greatest at earth's surface. Practically the maximum point of acceleration is in the Arctic Ocean, nearer to the coast of Greenland. 

Bound to the earth by gravity and due to friction with the earth surface and viscosity of multiple layers of air, atmosphere rotates with the earth constantly.

The attraction or fundamental interaction between the earth and an object or any two objects in the earth is known as Gravity.

The weight of an object is zero at the center of the Earth because the gravitational force from all directions cancels out. At this point, the gravitational acceleration (g) is zero, meaning the object would experience no net gravitational force. At the Earth's surface, the value of 'g' is maximum, and the object experiences its full weight.

Lubrication system first used by Wright Brothers. This system is considered to reduce temperature caused by friction between sliding or rolling parts, give a flow to the clean oil at the accurate temperature, with appropriate pressure to each part of the engine.

As the mountain slope is inclined at an angle from the normal ground, our body leans forward so that center of gravity becomes low in order to maintain the equilibrium position, provided that we don’t fall on our back.

Astronauts, orbiting the earth, do feel weightless as there is no ground or any other force to counteract the force of gravity; i.e. the astronauts orbiting the earth have acceleration equal to gravity.

The weight of an object is greatest in the polar region because the Earth is slightly flattened at the poles and bulges at the equator due to its rotation. This means the distance from the Earth's center to the poles is shorter than at the equator. Since gravitational force is stronger when objects are closer to the Earth's center, an object weighs more at the poles than at the equator.

The weight of an object on the earth is equal to multiplication of its mass and gravitational acceleration of the earth. The moon has one-sixth the acceleration than the earth. Hence, if an object is taken to moon, its weight will be reduced to one-sixth of the earth.