A force can be a push or a pull. For example, when you push open a door you have to apply a force to the door. You also have to apply a force to pull open a drawer.

Different forms of energy can be transferred from one form to another. Energy transfer diagrams show each form of energy - whether it is stored or not - and the processes taking place as energy is transferred.
The energy transfer diagram below shows the useful energy transfer in a car engine. You can see that a car engine transfers chemical energy, which is stored in the fuel, into kinetic energy in the engine and wheels.

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

A force is a push or a pull that acts upon an object as a result of its interaction with another object. Forces result from interactions!

According to Newton's first law, an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It is the natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain its state of motion. This is often called the law of inertia.

Newton’s Three Laws of Motion in Physics can tell you how long it takes for a car to stop once you hit the brake, why you might lose control rounding a curve and why some car collisions result in more damage than others.

NEWTON’S FIRST LAW & ROTATIONAL INERTIA
Theory- Mass in motion tend to stay in motion. Mass at rest tends to stay at rest. If an object is moving at constant velocity or is stationary, then the net forces (or torques) acting on it must be equal to zero (balanced). The blades have rotational inertia proportional to their mass and how the mass is distributed radially from the hub axis.

Aerodynamics is the way air moves around things. The rules of aerodynamics explain how an airplane is able to fly. Anything that moves through air reacts to aerodynamics. A rocket blasting off the launch pad and a kite in the sky react to aerodynamics. Aerodynamics even acts on cars, since air flows around cars.

When two solid objects interact in a mechanical process, forces are transmitted, or applied, at the point of contact. But when a solid object interacts with a fluid, things are more difficult to describe because the fluid can change its shape.

NEWTON’S FIRST LAW & “WATER HAMMER”
Theory- Mass in motion tend to stay in motion. Mass at rest tends to stay at rest. Inertia. Forces acting on the object are balanced (in equilibrium).

Theory- For a photon to be absorbed by a solar cell it must have enough energy to cause an outer shell electron to jump into the conduction band. The energy of the photon is given by its frequency times Planck’s constant. The energy gap that exists between the valence band and the conduction band in non-metals is called the band gap and is usually measured in electron-volts (eV). The energy of the photon must be greater than the energy of the band gap to eject a photoelectron.

The popular British astrophysicist, now touring Down Under, says cutting back on our energy use by turning off lights and air conditioning is not the answer. And neither is commissioning extra power plants.
Instead, he says we should move the production of energy away from Earth and into outer space, and our planet should become purely residential.

A third arrester bed at the start of the South Eastern Freeway in Adelaide could prevent out-of-control trucks from creating havoc on the notorious stretch of road, according to South Australia's peak road transport body.