For work, in the scientific sense, to be done,
a force must be exerted and there must be motion or displacement in the direction of the force.
What conditions must be met to do work?
What conditions must exist in order for a force to do work on an object? Some of the force must act in the same direction as the object moves.
A device that changes a force.
What 2 conditions must be met for work to be done?
The two conditions are:
(i) Application of-force on the body
. (ii) Displacement of the body in the direction of force.
How do you calculate work done?
Work can be calculated with the equation:
Work = Force × Distance
. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.
What two conditions must be satisfied for work to be done class 9?
Two conditions need to be satisfied for work to be done:
Force should act on the object. Object must be displaced.
What are the 3 conditions for work to be done?
- force should not be zero.
- object should be displaced.
- the angle between the force and displacement should not be zero.
What is transferred when work is done?
Work is the measure of energy transfer when a force (F) moves an object through a distance (d). So when work is done, energy has been transferred from one energy store to another, and so:
energy transferred = work done
.
What is the formula for work when force and distance are known?
In words: Work is equal to the force that is exerted times the distance over which it is exerted. In equation form:
work (joules) = force (newtons) x distance (meters)
, where a joule is the unit of work, as defined in the following paragraph.
What is the formula of work done 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.
1 Joule = 1 Newton × 1 metre
. The unit of work is joule. Work done on a body moving in circular path is zero.
What is velocity in physics class 9?
Velocity: Velocity is
the speed of an object moving in a definite direction
. The SI unit of velocity is also metre per second. Velocity is a vector quantity; it has both magnitude and direction.
Why do we fall ill Class 9 notes?
It may be
caused due to the attack of pathogens (virus, bacteria), lack of nutritious diet/balanced diet and lack of public health services
. The disease which lasts for only a short period of time is called Acute Disease. For example: Influenza (Flu), Common cold, etc. For example: TB, Cancer, etc.
What is free fall class 9th?
The falling of a body from a height towards the earth under gravitational force
is called Free fall. Such a body is called freely falling body. The earth attracts object towards it due to gravitational force. … The acceleration of an object falling freely towards the earth does not depend on mass of object.
In which situation is no work done?
If the force is perpendicular to the direction of displacement
, work done is zero. When the displacement opposite to the direction of force, work is negative.
What are the essential conditions for zero work?
Work is said to be done when applied force provides displacement for a body.
If there is no displacement for the body after the force is applied
then work done is zero. Another case is if the motion is perpendicular to the force then work done a zero.
What is the only difference between work and power?
Work refers to the
amount of energy required to displace an object from one place to another
. Power of the body refers to the energy consumed by the object to displace from one position to another.
How can energy be transferred when work is done?
When work is done, energy is transferred from the agent to the object, which results in
a change in the object’s motion
(more specifically, a change in the object’s kinetic energy).
