physics

Conductor is an object through which electricity can pass in one or more direction. Aluminium, Silicon, Graphite, Copper, Gold etc are the widely used examples of conductors.

The SI unit of electric charge is known as Columb, which is named after Charles Augustin de Columb-a renowned French physicist.

According to International System of Units (SI), Tesla (T) is the unit of magnetic flux density (also called magnetic strength) where one tesla is equal to one weber per square meter.

A simple machine is a mechanical device that changes the state of condition or force with least external (human) effort. So only Wheel among the above options can hardly propel itself without axle.

Convection results in the tendency to expand when heated-Water, Air etc.

Rocket Engine works based on third rule of Sir Isaac Newton-"For every action there is an equal and opposite reaction."

First rule-An object will not change its motion unless any external force acts on it. Second rule-Heavier objects need a larger force to move them. third rule-For every action there is an equal and opposite reaction.

As the train is running, the ball with the boy is also running in a same horizontal velocity. Hence the ball come back to the hand of the boy.

Due to higher center of gravity and limited suspension a car overturn quickly on a curved road. In other way, when a car overturn quickly on a curved road, its lower part moves towards the center very quickly, but its upper part doesn't follow accordingly.

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.

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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.

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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.

Literally tension is the force that is transmitted through any object when it is pulled on both sides. In this perspective momentu 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..

Attraction between the sun and moon is called Gravitational force.

The weight of an object is zero when it is kept at the center of the earth where g=o. g is maximum at the surface of the earth.

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 the most in the polar region as the acceleration due to gravity is greatest at poles.

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.

When a lift descends the apparent weight of a standing person inside it decreases as weight R=mg-ma=m(g-a).

If the elevator descends freely, the cord of the elevator is torn, below the acceleration “g”, a person within the elevator feels weightless.
If the elevator descends the acceleration “g”, a person within the elevator feels less than the original weight.

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