Since momenta of heavy body and light body are same, the velocity of lighter object is greater than that of heavier. Kinetic energy is proportional to the square of velocity. Hence lighter object has greater Kinetic energy.

Swing of ball is an art that can be explained through aerodynamics. The swing of the ball is ultimately caused by the asymmetric air flow on either side of the ball and the pressure exerted on the ball with the upper portion on the table.

A Jet Engine is a re-action engine -an engine which provides propulsion or thrust by expelling a reaction mass - and works according to Newton's third rule of motion: "For every action there is an equal and opposite reaction".

We don't fall because of the force of gravity that pulls us towards the middle of the earth, rotating at a constant rate, and keep our feet firmly on the surface of the earth.

Due to force of gravity, the value of acceleration on the moon is one-sixth of its value on the earth. Because of this rule the weight of an object on the moon will be the one-sixth than on the earth.

In standard temperature and pressure, 1 liter of water is equal to 1 kilogram. Similarly, 3 liter of water is equal to 3-kilogram standard weight. 

A lactometer is a little glass instrument that is used to check for the purity of milk by measuring its density or to find out the content of the water in the milk or to test the richness of the milk. It works on the principle of the specific gravity-the more the amount of water in milk, the more the lactometer will sink in milk. Whereas, the more the milk with cream, the less the lactometer will float.

Hygrometer is an instrument used to measure the humidity in the air, i.e. the amount of vapor in the air, dust and other particles.

 Fathometer is an instrument that is often used for measuring the depth of the sea. It is generally attached beneath a ship or boat and sends echoes and sound waves to the basin of the sea and measures how long it takes for an echo to return for measuring the depth.

Rockets are built to launch spaceship based on third law of motion of Sir Isaac Newton-To every action there is equal and opposite reaction.