Answer: Work is said to be done when a force applied to an object moves that object. We can calculate work by multiplying the force by the movement of the object.
What is the work being done on Class 9?
Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force.
Why do we say that work is done?
Work is said to be done when the force is applied on an object and it moves through a distance in the direction of application of force.
How can you say that no work is done?
Work is said to be done when displacement takes place in the direction of force. When the force makes an angle with the direction of force the component of force along the direction of displacement is taken. If the force is perpendicular to the direction of displacement, work done is zero.
What is work done?
In summary, work is done when a force acts upon an object to cause a displacement. Three quantities must be known in order to calculate the amount of work. Those three quantities are force, displacement and the angle between the force and the displacement.
What are the types of work done?
Positive, Negative and Zero work done
Positive Work : If a force displaces the object in its direction, then the work done is positive. Negative Work : If the force and the displacement are in opposite directions, then the work is said to be negative.
What is work done by a constant force?
The work done by a constant force can be defined as the product of the displacement of the object (to which the force is applied) and the component of the constant force which is parallel to the direction of displacement.
When work is done and not done?
Work is not said to be done when an object moves at 90 degree to the direction of the force. Because work done = F.x Cosθ = F.x Cos90 = 0 (Since Cos90 degree is zero). Hence when force and displacement angle are perpendicular to each other no work is said to be done.
What is positive work done?
When force and displacement are in the same direction, the work performed on an object is said to be positive work. Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.
What is needed for work to be done?
Work is when you exert a force on an object that causes the object to move some distance. In order for work to be done on an object, what must happen to the object? A force must be applied to the object and the object must move at least partly in the direction in which the force is applied.
