How do you fully describe a vector?
A vector is a quantity which has both magnitude and direction. Examples of vectors include displacement, velocity, acceleration, and force. To fully describe one of these vector quantities, it is necessary to tell both the magnitude and the direction.
How do you know if a vector is defined?
A vector quantity has a direction and a magnitude, while a scalar has only a magnitude. You can tell if a quantity is a vector by whether or not it has a direction associated with it. Example: Speed is a scalar quantity, but velocity is a vector that specifies both a direction as well as a magnitude.
What is the starting point of a vector?
A vector is always shown by an arrow when it is represented by a line segment. The starting point of a vector is known as initial point and the end point is known as terminal point.
Why is energy not a vector?
There is no special preference given to any spatial direction. So kinetic energy does not depend on direction, hence it must be a scalar, not a vector. There is nothing that prohibits defining scalars in terms of vectors, although incidentally, the v in kinetic energy is speed (|v|, a scalar), not velocity.
Can work done be positive?
The physics definition of “work” is: Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.
What are the three conditions when work done is said to be zero?
Work done is said to be zero when force applying to the body is zero or the Displacement done by body pic zero. if the value that means force acting on body is perpendicular then the force acting will be equals to zero. For e.g.
What is workless force?
That means, one or more forces can act on a body perpendicular to the direction of motion. If point of action of these forces makes an angle of 90° with the direction of displacement, then these forces do not perform any work. This type of force is called workless force.
What is workless force give two examples?
There are many important examples of forces which do no work because they act perpendicular to the motion. For circular motion, the centripetal force always acts at right angles to the motion. It changes the direction of the motion, but it does no work on the object. This can be applied to any circular orbit.
What is workless force give an example?
ZERO WORK:The work done is said to be zero work when force and displacement are perpendicular to each other or when either force or displacement is zero. example: When we hold an object and walk,the force acts in downward direction whereas displacement acts in forward direction. Answer verified by Toppr. 590 Views.
What is the work done by centripetal force?
The direction of centripetal force is always perpendicular to the direction of instantaneous velocity. The instantaneous displacement is in the direction of instantaneous velocity, therefore instantaneous displacement of particle is perpendicular to centripetal force. Hence work done by centripetal force is zero.