WORK POWER AND ENERGY TEST PAPER

WORK POWER AND ENERGY

1.       When will we say that work is said to be done?

2.       Define 1 joule of work.

3.       Derive an expression for the kinetic energy for the particle in motion.

4.       Define law of conservation of energy. Derive it mathematically.

5.       Name the factors on which work done depends.

6.       Define power and write down its commercial unit.

NOTES WORK POWER AND ENERGY CLASS 9TH

Class IX: Science

Chapter: Work and Energy

Chapter notes

Key Learning:

1.            Work is done when force acting on a body produces displacement in it.

2.            Work done = Force ×   displacement in the direction of force

3.            Work is a scalar quantity.

Chapter Our environment

Class X: Biology

Chapter Notes

Key learning:

1)    Our environment is composed of various biotic and abiotic factors which interact with each other.

2)    Human activities have a great impact on the functioning of the environment.

Chapter Management of natural resources

Class X: Biology

Chapter Notes

Key learnings:

1)    The natural resources like water, soil, forests, wild-life, coal, petroleum etc. should be utilized in a sustainable manner in order to conserve our environment.

GUESS QUESTIONS CLASS 10TH

HIGH YIELD TERMS

Q.1 Describe the structure of the modified blood vessel of our BODY which is extremely modified?

Ans:-Heart is a muscular pumping organ, made up of cardiac muscles.

Mammalian heart has 4 compartments of chambers:

PROJECT HEAT PART 2

HEAT ENERGY

When caloric theory failed to explain the production of heat due to friction, as observed in paddle –wheel experiment, scientists put forward the dynamic theory of heat according to which:

1. Heat energy is the total KE of all the molecules due to transitional, vibrational and rotational motions.

PROJECT HEAT (FROM MY OLD REGISTER)

HEAT ENERGY

When caloric theory failed to explain the production of heat due to friction, as observed in paddle –wheel experiment, scientists put forward the dynamic theory of heat according to which:

1. Heat energy is the total KE of all the molecules due to transitional, vibrational and rotational motions.
2. Heat lost or gained by the system depends on initial state final state and path taken up by the process.