## What is the formula of work done?

What is Work, Energy and Power? | |
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Work | |

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) |

**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.

### 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).

**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.

## 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.

**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.

### 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.

**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.

## 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.

**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.

### 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.

**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 .

## 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.

**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.