How is Class 9 work calculated?
Work Done
- Work Done. •
- Work done = force × distance.
- = F × s. 1 Joule = 1 Newton × 1 metre.
- • Work done by a force acting obliquely is equal to W = F cos θ × s. •
- Energy. •
- Power. •
What is energy of class 9th?
The capacity of a body to do work is called the energy of the body. Unit of energy = Joules 1KJ = 1000 J. Forms of Energy: The various forms of energy are potential energy, kinetic energy, heat energy, chemical energy, electrical energy and light energy.
What is negative work class 9?
If the force and the displacement are in opposite directions, then the work is said to be negative. Negative work just means that the force and the displacement act in opposite directions. …
What is the difference between positive and negative work class 9?
Grade 9. a. positive work is done by the muscular force because the displacement is in the direction of the muscular force . negative work is down by the gravitational force because displacement is in the opposite direction to which the gravitational force is acting …
What is an example of negative work?
Negative work follows when the force has a component opposite or against the displacement. Negative work removes or dissipates energy from the system. Two examples: In pulling a box of books along a rough floor at constant velocity, I do positive work on the box, that is I put energy into the system.
What is positive work and negative work class 9?
Hint: If force and displacement would be in the same way, it is stated that the work carried out on an object is positive, and if they are in opposite ways, it is negative work done. If force and displacement become perpendicular to one another, it is zero work.
What is the positive negative and zero work?
Positive work done – The work done is said to be positive when force and displacement are in the same direction. Zero work – the work done is said to be zero when force and displacement are perpendicular to each other.
When energy is positive and negative?
Most physicists think, however, that there is an equal amount of “negative energy” stored in the gravitational attraction that exists between all the positive-energy particles. The positive exactly balances the negative, so, ultimately, there is no energy in the universe at all.