Some interesting facts about mechanics for learners

When the distance between two bodies is halved, the force of attraction between them will be one-fourth.

A wall clock loses 2 minutes a day in summer. To rectify this, we have to decrease the length of the pendulum.

In a vacuum, a stone, and a feature are dropped at the same time from the same height. All will reach the ground at the same time.

When a piece of rock is taken from the moon to the earth, its weight will change but not its mass. Because of weight depends upon gravity.

It is easier to climb down a staircase than climb up. Because in climbing down, gravity assists.

The earth constituted the centre of the universe around which the sun and the planets revolved was propounded by Kepler.

It is more difficult to walk on ice than on a concrete road because there is very little friction between the ice and the feet pressing it.

When the velocity of a body is halved, its momentum is halved.

The body was successive displacement of 1m, 2m, and 3m in the first, second and third seconds of its motion, all in the same direction. This shows that the acceleration of the body is increasing.

The scalar quantities indicated the magnitude of units such as force, velocity, 

acceleration etc. But the vector quantities indicate the magnitude along with the direction of those units such as speed.  

If you want to open a door with less difficulty, you push it at a point away from the hinge.

A body has fallen from a height. Just before touching the ground it has lost all its potential energy and gained an equivalent amount of kinetic energy.

When a swing is drawn to a side, its potential energy about the earth increases.

A person does not sink in the Dead Sea. Because the density of the person is less than the density of the Dead Sea water.

Two bodies A of volume 20 cm³ and B of volume 30 cm³ are found to weigh the same when fully immersed in water. If weight is in the air, B will weigh more than A. Because the volume of B is more, it loses more weight in water.

The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications of Pascal’s law.