Class 9th- Work and Energy ( Prashant Kirad ).pdf
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/49
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai | Chat |
|---|
No analytics yet
Send a link to your students to track their progress
50 Terms
Work
In science, work is done when a force produces displacement in the direction of the applied force.
Kinetic Energy
Energy due to motion, dependent on the mass and velocity of an object.
Potential Energy
Energy due to height or position, allowing the object to do work.
Law of Conservation of Energy
Energy cannot be created or destroyed, only transformed from one form to another.
Power
The rate of doing work, measured in Watts (1 Watt = 1 Joule/second).
Work-Energy Theorem
The total work done by the sum of all forces acting on a particle is equal to the change in the kinetic energy of that particle.
Positive Work
Work done when the force and displacement are in the same direction.
Zero Work
Work done when the force and displacement are perpendicular.
Negative Work
Work done when the force and displacement are in opposite directions.
SI Unit of Work
Joule (J), equal to the work done when a force of 1 Newton displaces an object by 1 meter.
Kinetic Energy Formula
K.E = 1/2 mv², where m is mass and v is velocity.
Potential Energy Formula
P.E = mgh, where m is mass, g is gravitational acceleration, and h is height.
Mechanical Energy
The sum of kinetic and potential energy in an object.
Gravitational Potential Energy
Potential energy relative to an object's height above a reference point, calculated as mgh.
Work Done by Gravity
The work done by the gravitational force on an object, calculated as the change in gravitational potential energy.
Conservative Forces
Forces for which the work done is independent of the path taken and depends only on the initial and final positions.
Non-conservative Forces
Forces for which the work done depends on the path taken, such as friction.
Efficiency
The ratio of useful work output to total work input, often expressed as a percentage.
Impulse
The product of the average force and the time duration during which the force acts; it's equal to the change in momentum.
Momentum
The quantity of motion of a moving body, calculated as the product of mass and velocity.
Net Work
The total work done on an object considering all forces acting on it.
Isolated System
A physical system that does not interact with its surroundings, where the total energy remains constant.
Work
In science, work is done when a force produces displacement in the direction of the applied force.
Kinetic Energy
Energy due to motion, dependent on the mass and velocity of an object.
Potential Energy
Energy due to height or position, allowing the object to do work.
Law of Conservation of Energy
Energy cannot be created or destroyed, only transformed from one form to another.
Power
The rate of doing work, measured in Watts (1 Watt = 1 Joule/second).
Work-Energy Theorem
The total work done by the sum of all forces acting on a particle is equal to the change in the kinetic energy of that particle.
Positive Work
Work done when the force and displacement are in the same direction.
Zero Work
Work done when the force and displacement are perpendicular.
Negative Work
Work done when the force and displacement are in opposite directions.
SI Unit of Work
Joule (J), equal to the work done when a force of 1 Newton displaces an object by 1 meter.
Kinetic Energy Formula
K.E = 1/2 mv², where m is mass and v is velocity.
Potential Energy Formula
P.E = mgh, where m is mass, g is gravitational acceleration, and h is height.
Mechanical Energy
The sum of kinetic and potential energy in an object.
Gravitational Potential Energy
Potential energy relative to an object's height above a reference point, calculated as mgh.
Work Done by Gravity
The work done by the gravitational force on an object, calculated as the change in gravitational potential energy.
Conservative Forces
Forces for which the work done is independent of the path taken and depends only on the initial and final positions.
Non-conservative Forces
Forces for which the work done depends on the path taken, such as friction.
Efficiency
The ratio of useful work output to total work input, often expressed as a percentage.
Impulse
The product of the average force and the time duration during which the force acts; it's equal to the change in momentum.
Momentum
The quantity of motion of a moving body, calculated as the product of mass and velocity.
Net Work
The total work done on an object considering all forces acting on it.
Isolated System
A physical system that does not interact with its surroundings, where the total energy remains constant.
Mechanical Advantage
The factor by which a machine increases the force applied to it.
Work-Energy Principle
The principle that the work done on an object is equal to the change in its kinetic energy.
Simple Machine
A device that changes the magnitude or direction of a force, making work easier to perform.
Energy Transfer
The process of moving energy from one place or form to another.
Elastic Potential Energy
Potential energy stored in elastic materials as the result of their stretching or compressing.
Dissipative Forces
Forces, like friction, that cause energy to be transformed into heat energy, resulting in energy loss.