C9. Work, energy and power
1. Define work. What is its SI unit.
2. When a does a force work?
3. What are the factors on which the work on a body depends?
4. Define 1 Joule work.
5. Is work a scalar or vector quantity?
6. Write down the differences between energy and power.
7. What are the different forms of mechanical energy?
8. What do you meany by energy and power? Write their units.
9. Define kinetic energy and potential energy with examples.
10. Derive the mathematical expression for Kinetic energy and potential energy.
11. Write down the differences between work and energy.
12. Write a situation in which force is applied on a body but there is no work done by the body.
13. When a does a force work? How is the work done measured?
14. What do you mean by transformation of energy?
15. State the principle of conservation of energy.
Posts
Q.1.Namrata:The transfer of energy from one object to another, especially in order to make the second object move in a certain direction is known as work. Its SI unit is Joule(J).
ReplyDeleteQ.no.3 Roshika Thapa:The factors on which the work on a body depends are: 1.The magnitude of the applied force. 2.The distance through which a body moves.
ReplyDeleteQ.4.Namrata: One joule of work is said to be done when a force of one newton is applied over a distance of one meter.
ReplyDeleteQ.no.2.Namrata: A Force is said to do work when it acts on a body so that there is a displacement of a object in the direction of the force.
ReplyDeleteQ.8.Shreya:Energy is the capacity to do work.It's SI unit is Joule(J).
ReplyDeletePower is defined as the rate of doing work.It's SI unit is Watt(W).
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Q.5.Roshan: Work is a sclar quantity because it is the product of 2 vectors quantity.
ReplyDeleteQ.no.4.Dinesh:1 joule work is the amount of the work done when a force of one Newton acting a body moves it,through a distance of one metre in the direction of force.
ReplyDeleteQ.7.Namrata: The different forms of Mechanical energy are:
ReplyDeletei)Kinetic energy
ii)Potential energy
Q.no.5 Roshika Thapa:Work is a scalar quantity.Since, it has only magnitude but no direction.
ReplyDeleteQ.n.8.Roshan: Energy is the capacity of to do work and its unit is Joule (J).
ReplyDeletePower is defined as the rate of doing work.It's SI unit is Watt(W).
Q.no.14.Dinesh:Transformation of energy is the process of changing energy from one form to another
ReplyDeleteQno 9 (Shiwani)=The energy possessed by a body by virtue of its position or state (configuration) is called potential energy.for eg water in a dam ,stretched spring,etc
ReplyDeleteThe energy possessed by a body by virtue of its motion is called kinetic energy.for eg moving bat,rolling ball,etc
Q.9.Shreya:The energy possessed by a body by virtue of its motion is called kinetic energy.Some examples are:the energy of flowing water,moving car,flying birds,etc.
ReplyDeleteThe energy possessed by a body by virtue of its position or configuration is called potential energy.Some examples are:gravitational potential energy,electrical potential energy,etc.
Qno 9 (Shiwani)=The energy possessed by a body by virtue of its position or state (configuration) is called potential energy.for eg water in a dam ,stretched spring,etc
ReplyDeleteThe energy possessed by a body by virtue of its motion is called kinetic energy.for eg moving bat,rolling ball,etc
Q.15.Namrata: The principle of conservation of energy states that the total amount of energy remains the same in such conversions, i.e. energy cannot be created or destroyed.
ReplyDeleteQ.no.11.dinesh:
ReplyDeleteWork
1.it is the product of force applied and the distance covered in the direction of force
2.it is not related with time
3. It is measured in joule
Energy
1.it is the capacity of a body to perform work.
2.In SI unit the unit of energy is joule
3.energy exists in different forms.
Q.9.Roshan : The energy by a body by virtue if its morion is called .Eg:Moving Car, Bullet from the gun etc.
ReplyDeleteThe energy possessed by a body by virtue of its position or state is called potential energy.Eg:A raised weigh,Water that is behind a dam etc.
Q.no.13.Namrata: A Force is said to do work when it acts on a body so that there is a displacement of a object in the direction of the force.
ReplyDeleteThe work is calculated by multiplying the force by the amount of movement of a object i.e. (W = F/d).
Q.no.15.Roshan: The principle of conservation of energy state that energy can neither be neither be created nor destroyed,it can simply be transformed into energies of different forms, the total energy before transformation is equal to the sum of the different energies obtained after transformation.
ReplyDeleteQ.no.15.Dinesh:the principal of energy is that energy can't be created or destroyed but it can transfer into different form.
ReplyDeleteQ.no.15 Roshika Thapa:The principle of conservation of energy states that"Energy can neither be created nor be destroyed, it can only be transformed from one form to another form".
ReplyDeleteQ.14:The process of changing one form of energy into another form of energy is called transformation of energy.
ReplyDeleteQ.n.4.Roshan :1 Joule work is the amount of the work done when a force of one newton acting a body moves it,through a distance of one metre in the direction of force.
ReplyDeleteone. form of energy may be converted into another. This change of energy form one form to another is known as transformation of energy
ReplyDeletedipesh darji
DeleteQ.no.6 Roshika Thapa: The differences between energy and power are: Energy 1.It is the capacity of a body to do work. 2.It's SI uni is Joule (J). 3.Energy can be transformed from one form to another. 4.Energy exists in different forms. Power 1.It is the rate of doing work. 2.It's SI unit is Watt (W). 3.Power cannot be transformed. 4.Power doesnot exist in forms.
ReplyDelete