- published: 03 Jun 2016
- views: 126516
In physics, a force is any interaction that, when unopposed, will change the motion of an object. In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described by intuitive concepts such as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.
The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time. If the mass of the object is constant, this law implies that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque, which produces changes in rotational speed of an object. In an extended body, each part usually applies forces on the adjacent parts; the distribution of such forces through the body is the so-called mechanical stress. Pressure is a simple type of stress. Stress usually causes deformation of solid materials, or flow in fluids.
Tough times demand, tough talk demand
Tough hearts demand tough songs
Tough times demand, tough talk demand
Tough hearts demand, tough songs demand
We can rise and fall like empires
Flow in and out like the tide
Be vain and smart, humble and dumb
We can hit and miss like pride, just like pride
We can circle around like hurricanes
Dance and dream like lovers
Attack the day like birds of prey
A scavengers under cover, under cover
Look in to the eye of the storm
Look out for the force without form
Look around, sight and sound
Look in, look out, look around
Tough times demand, tough talk demand
Tough hearts demand, tough songs demand
We can move with savage grace
To rhythms of the night
Cool and remote like dancing girls
In my heat of the beat and the lights, and the lights
We can wear the rose of romance
An air of joie de vivre
To tender hearts upon our sleeves
Skin as thick as thieves, thick as thieves
Look in to the eye of the storm
Look out for the force without form
Look around at the sight and sound
Look in, look out, look around
Tough times demand, tough talk demand
Tough hearts demand, tough songs demand
Look in to the eye of the storm
Look out for the force without form
Look around at the sight and sound
Look in with the storm in the eye
Look out for the sea and the sky
Look around at the sight and sound
Look in, look out, look around
Tough times demand, tough hearts