Which is the best definition of work?
Definition of work (Entry 2 of 3) 1 : activity in which one exerts strength or faculties to do or perform something: a : activity that a person engages in regularly to earn a livelihood people looking for work. b : a specific task, duty, function, or assignment often being a part or phase of some larger activity.
What is work and energy?
The principle of work and kinetic energy (also known as the work–energy principle) states that the work done by all forces acting on a particle (the work of the resultant force) equals the change in the kinetic energy of the particle.
Which of the following is definition of work?
Work is force applied over distance. Examples of work include lifting an object against the Earth’s gravitation, driving a car up a hill, and pulling down a captive helium balloon. Work is a mechanical manifestation of energy. The standard unit of work is the joule (J), equivalent to a newton – meter (N · m).
What is the formula of work done?
|What is Work, Energy and Power?|
|Definition||Work is said to be done when a force applied to an object moves that object.|
|Formula||We can calculate work by multiplying the force by the movement of the object. W = F × d|
|Unit||The SI unit of work is the joule (J)|
What is work give two examples?
For something to be considered work, the force you apply and the distance you apply must be in the same direction. Examples: Pushing a car horizontally from rest; shooting a bullet (the powder does the work); walking up stairs; sawing a log.
What is no work is done?
If a force is applied but the object doesn’t move, no work is done; if a force is applied and the object moves a distance d in a direction other than the direction of the force, less work is done than if the object moves a distance d in the direction of the applied force.
Can work done is negative?
The work done by a body can be negative when the force acts opposite to the direction of displacement. Work done by a force is positive if the applied force has a component in the direction of the displacement.
Is negative force attractive?
Of course, the gravitational force is always attractive, so this minus sign is always present, but in different kind of forces such as Coulomb force, a negative module means an attractive force while a positive module means a repulsive one, and the sign of the module comes from the sign of the charges.
How do you know if a force is repulsive or attractive?
When using the “+” and “-” signs in the calculation of force, the result will be that a “-” value for force is a sign of an attractive force and a “+” value for force signifies a repulsive force.
Is force of attraction negative?
Answers and Replies. In the usual radial coordinate system the positive r direction is outward. So a repulsive force is in the positive r direction and an attractive force is in the negative r direction .
Is negative gravity possible?
Although the equations cannot normally produce a “negative geometry”, it is possible to do so by using “negative mass”. Both general relativity and Newtonian gravity appear to predict that negative mass would produce a repulsive gravitational field.
Can electric force be attractive and repulsive?
The electric force F E F_E FEF, start subscript, E, end subscript can be either attractive or repulsive. Opposite charges, such as a positive charge and a negative charge, attract each other.
Is gravitational force always attractive?
We all know that all the forces in nature exist in opposites, but gravitational force is the obly force which always attracts every object and never reples any.
Why gravity is so weird?
2. Why is gravity so weird? No force is more familiar than gravity — it’s what keeps our feet on the ground, after all. And Einstein’s theory of general relativity gives a mathematical formulation for gravity, describing it as a “warping” of space.