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 do you mean by positive work?
POSITIVE WORK: The work done on an object is said to be positive work
when force and displacement are in same direction
. Example: When an object moves on horizontal surface, force and displacement acts in same direction. So, work done is positive.
What is positive work and negative work class 9?
Positive work done – The work done is said
to be positive when force and displacement are in the same direction
. … Negative work done – The work done is said to be negative when force and displacement are in opposite directions.
What is negative work class 9?
Negative work
If the force and the displacement are in opposite directions
, then the work is said to be negative. For example if a ball is thrown in upwards direction, its displacement would be in upwards direction but the force due to earth’s gravity is in the downward direction.
What is positive and negative in physics?
To physicists, the velocity is the rate at which the position is changing. … A positive velocity simply means that the object is moving in the positive direction, as defined by the coordinate system, while a
negative velocity means the object is traveling in the other direction
.
What is work in 9th class?
Work is defined as a force acting upon an object to cause a displacement. It is expressed as the product of force and displacement in the direction of force.
W=F x s
.
When work is positive or negative?
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 is work done formula?
Mathematically, the concept of work done W equals the force f times the distance (d), that is W = f. d and if the force is exerted at an angle θ to the displacement, then work done is calculated as
W = f . d cos θ
.
How do you calculate work?
The formula for work is ,
work equals force times distance
. In this case, there is only one force acting upon the object: the force due to gravity. Plug in our given information for the distance to solve for the work done by gravity.
What do you mean by free fall?
Free fall is the term that is used to describe
a falling object that only has gravity acting upon it
. Free falling objects accelerate at a rate of 9.8 m/s/s.
What is power for class 9th?
We can define power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is
joules per second
(J/s).
What is zero work done with example?
1) A simple example of zero work is
when you stand holding a bag in your hands and do not move it
. Your hands apply a force on the bag to balance the force of gravity exerted on it but since there is no displacement of the bag, the work done on it by you (your force) and also the gravity is zero.
What do you mean by Energy Class 9?
Energy : The energy may be
defined as the capacity of a body to do work
. – The SI unit of energy is joule (J). or 1 kJ = 1000 J. Forms of energy : The various forms include potential energy, kinetic energy, heat energy, chemical energy, and light energy. 4.
What is positive work done in physics?
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 negative positive?
They can have one of two values: positive or negative. Positive integers have values greater than zero. Negative integers
have values less than zero
.
Which lens has positive power?
(a)
Convex lens
has positive power.
