Diese Präsentation wurde erfolgreich gemeldet.

# Work Energy & power

Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Nächste SlideShare
2.3 - Work Energy & Power
×

1 von 8 Anzeige

# Work Energy & power

Work Energy

Work Energy

Anzeige
Anzeige

## Weitere Verwandte Inhalte

Anzeige

Anzeige

### Work Energy & power

1. 1. WORK,ENERGY & POWER SHAHBAZ AHMED 15CH44
2. 2. Work: • When a force acts on a body in such a way that body covers some displacement, it is called work. • Work(W) is defined as a product of force(F) and displacement(d) • Work can be defined as transfer of energy. • Work is scalar quantity. • InSI unit of work is Joule( J ). J=N×m • If force makes an angle with the direction of motion, then for finding work done, that component of force will be taken which acts in the direction of motion(Fcos ) .W=F cos d • W=F cos d
3. 3. Continue… • (A) When direction of force and displacement is same the work done is positive • (B) When direction of force and displacement is opposite the work done is negative. • (C) When force and displacement are mutually perpendicular to each other the work done is zero.
4. 4. POWER : • The rate of doing work is known as power. Power= 𝑤𝑜𝑟𝑘 𝑡𝑖𝑚𝑒 • Power is a scalar quantity. • Unit of Power is watt or J/s. • Other common unit is horse power. • 1hp=746Watt.
5. 5. Energy: The ability of doing work is called Energy. In SI units energy is measured in Joule(J). Energy is scalar quantity.
6. 6. ENERGY Mechanical Non- Mechanical Kinetic Potential Linear Rotational Gravitational Elastic Electric Magnetic Light Sound Heat
7. 7. Law of Conservation of energy • Statement=Energy is neither created nor destroyed, but one form of energy is converted into an other form of energy, so total energy of the system remains constant. • Explanation= In an isolated system from the motion of the pendulum above law of conservation of energy is proved in following way. P.E=100J K.E= OJ P.E= O J K.E = 100 J A B