Science Fill in the blank

​​​​​​Acceleration due to gravity is zero at centre of earth.
Explanation:
Acceleration due to the earth's gravity is zero at the centre of the Earth because at that point the mass of the earth is equally distributed in all directions, so pulling equally in all directions for a net zero pull. As the distance from the centre decreases, the acceleration due to gravity also decreases.

The weight of an object on the earth is about six times of its weight on the moon.

The weight of an object on the moon is about one-sixth of its weight on the earth.

Acceleration due to gravity is independent of mass of falling body.
Explanation: Mass does not affect the acceleration due to gravity in any measurable way. Therefore, the value of acceleration due to gravity is independent of mass of the body.

If the area of a snow shoe is five times bigger than the area of an ordinary shoe, then the pressure of a snow shoe on the snow is five times smaller.

In order to sink in a fluid, the density of an object must be less than the density of the fluid.

In fluids (liquids and gases), pressure acts in all directions, and pressure increase as the depth increases.

It is the buoyant force which makes objects appear lighter in water.

In order that the force of gravitation between two bodies may become noticeable and cause motion, one of the bodies must have an extremely large Mass.

The acceleration due to gravity on the moon is about One-sixth of that on the earth.

The value of g on the earth is about six times of that on the moon.

Force acting on a unit area is called pressure.

An object has zero weight in outer space and during free fall.
Explanation: An object kept in a lift which falls freely, weighs zero on the weighing machine, but its actual weight is still mg. This happens because the normal reaction force exerted on the object in the lift is equal to zero, and normal force equals to mg, which in turn equals the weight of the object.

Snow shoes work by spreading out a person’s weight over a much bigger area.

A heavy ship floats in water because its average density is less than that of water.