ENERGY AND POWER
This ppt is from XI class CBSE board
Energy
A body which has the capacity to do work is said to possess energy.
For example , water in a reservoir is said to possesses energy as it could be used to drive a turbine lower down the valley. There are many forms of energy e.g. electrical, chemical heat, nuclear, mechanical etc.
The SI units are the same as those for work, Joules J.
In this module only purely mechanical energy will be considered. This may be of two kinds, potential and kinetic.
Power
Power is the rate at which work is done, or the rate at which energy is used transferred.
Equation 3.6
The SI unit for power is the watt W.
A power of 1W means that work is being done at the rate of 1J/s.
Larger units for power are the kilowatt kW (1kW = 1000 W = 103 W) and
the megawatt MW (1 MW = 1000000 W = 106 W).
If work is being done by a machine moving at speed v against a constant force, or resistance, F, then since work doe is force times distance, work done per second is Fv, which is the same as power.
ENERGY AND POWER
This ppt is from XI class CBSE board
Energy
A body which has the capacity to do work is said to possess energy.
For example , water in a reservoir is said to possesses energy as it could be used to drive a turbine lower down the valley. There are many forms of energy e.g. electrical, chemical heat, nuclear, mechanical etc.
The SI units are the same as those for work, Joules J.
In this module only purely mechanical energy will be considered. This may be of two kinds, potential and kinetic.
Power
Power is the rate at which work is done, or the rate at which energy is used transferred.
Equation 3.6
The SI unit for power is the watt W.
A power of 1W means that work is being done at the rate of 1J/s.
Larger units for power are the kilowatt kW (1kW = 1000 W = 103 W) and
the megawatt MW (1 MW = 1000000 W = 106 W).
If work is being done by a machine moving at speed v against a constant force, or resistance, F, then since work doe is force times distance, work done per second is Fv, which is the same as power.
This slide describes the idea of work and work-done and various idea and principles about energy and its utilization. It defines the basic aspects of work and how it is related to each other
This is a Powerpoint presentation based on the physics concept of work, energy, and power. It includes all you want to know about work done, different types of energies, laws of conservation of energy and power.
This slide describes the idea of work and work-done and various idea and principles about energy and its utilization. It defines the basic aspects of work and how it is related to each other
This is a Powerpoint presentation based on the physics concept of work, energy, and power. It includes all you want to know about work done, different types of energies, laws of conservation of energy and power.
Welcome to the fascinating world of Work, Energy, and Power! In the realm of physics, these concepts form the cornerstone of understanding how objects interact with each other and how energy is transformed within systems. From the motion of everyday objects to the dynamics of celestial bodies, the principles of work, energy, and power are ubiquitous, shaping the very fabric of the universe.
For more information, visit-www.vavaclasses.com
Part b1)Mass (kg)Velocity (ms)Force (N)Acceleration (ms2)Time to.docxherbertwilson5999
Part b1)Mass (kg)Velocity (m/s)Force (N)Acceleration (m/s2)Time to come to rest (s)stopping distance (m)
Lab 4--Part b1)
An object with a mass 'm' is moving with an initial speed 'v'and is acted on by a single force ‘F’ in the opposite direction of its motion. Use Excel to determine how long it will take the object to come to rest and how far the object travels until it stops..
i) If the mass is doubled, what is the effect on the time?, on the stopping distance?
ii) If the initial velocity is doubled, what is the effect on the time?, on the stopping distance
input: mass, initial velocity, force
output: acceleration, time to come to rest, stopping distance
Part b2)Mass (kg)Fx (N)Fy (N)ax (m/s2)ay (m/s2)2000050000100000time (s)vx(m/s)vy(m/s)v(m/s)x(m)y(m)d (m)00.511.522.533.544.555.566.577.588.599.510
Lab 4--Part b2)
A rocket ship, with mass m=40,000kg, and engines mounted perpendicularly in the x and y directions, fires both rockets simultaneously. The engine oriented in the x-direction fires for 3s and shuts off. The engine oriented in the y-direction fires for 7s and shuts off. The force from the engine in the x-direction is 50,000N and the force from the engine in the y-direction is 100,000N. Make a scatter plot of the y-position of each particle as a function of the x-position, showing the trajectory of the rocket.
Use Excel to determine the following:
i) While the engines are firing, what is the acceleration of the rocket in the x and y directions?
ii) After 7s, what is the velocity of the rocket in the x and y directions?
iii) After 7s, what is the speed of the rocket?
iv) After 7s, how far has the rocket travelled in the x-direction? How far has it travelled in the y-direction?, After 10 s?
v) After 7s, what is the displacement of the rocket? After 10 s? Is the displacement of the rocket the same as the distance travelled? Explain.
vi) If the mass of the rocket is doubled, what happens to the displacement?
Output: ax, ay, vx, vy, x, y, d
Rocket Trajectory
x
y
Part a1)Mass (kg)Force (N)Acceleration (m/s2)105010100205020100
Lab 4--Part a1)
Use Excel to determine the acceleration for an object with mass 'm' being pulled by a constant,
horizontal force (F) on a flat, frictionless surface.
i) What happens to the acceleration if the magnitude of the force doubles?
ii) What happens to the acceleration if the mass of the object doubles?
iii) What happens to the acceleration if both the mass and the force are doubled?
Input: mass and force
Output: acceleration
Part a2)Mass (kg)Angle (degrees)μkμsf_s(max)f_kF_Wsin(q)Acceleration (m/s2)Accelerating or Stationary?400.20.5450.20.54100.20.54150.20.54200.20.54250.20.54260.20.54270.20.54280.20.54290.20.54300.20.54350.20.54400.20.54450.20.54500.20.510500.20.54900.20.5
Lab 4--Part a2)
Use Excel to determine the acceleration for an object with mass 'm' sliding down a surface inclined at an angle θ (between 0 and 90 degrees) above the horizontal. The surfac.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
for beginners, providing thorough training in areas such as SEO, digital communication marketing, and PPC training in Noida. After finishing the program, students receive the certifications recognised by top different universitie, setting a strong foundation for a successful career in digital marketing.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
Delivering Micro-Credentials in Technical and Vocational Education and TrainingAG2 Design
Explore how micro-credentials are transforming Technical and Vocational Education and Training (TVET) with this comprehensive slide deck. Discover what micro-credentials are, their importance in TVET, the advantages they offer, and the insights from industry experts. Additionally, learn about the top software applications available for creating and managing micro-credentials. This presentation also includes valuable resources and a discussion on the future of these specialised certifications.
For more detailed information on delivering micro-credentials in TVET, visit this https://tvettrainer.com/delivering-micro-credentials-in-tvet/
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
2. What is work?
Work (W) Work is defined as a force acting upon an object to cause a
displacement. It is expressed as the product of force and displacement
in the direction of force. W=F x s.
Work is done when a force produces motion.
In the following picture you can see that a man is pushing the box with a
certain force say 5N to cover a distance of 2m so his work done will be
10J. Joules is the SI unit of work = 1 KG m2/s2.
Energy is capacity of a body to do work.
4. Work depends upon-
The work done on a body depends upon two factors: Magnitude of the force (F),
and. The displacement through which the body moves (s).
We can now say that work done in moving body is equal to the product of the
force exerted on the body and the distance moved by the body in the direction of
force.
When the body is moved on the ground by applying force, then the work is done
against friction(which opposes motion of the body)
5. Unit of work
Work is the product of force and distance. Now unit of force is newton(N) and
distance is metre (m) so the unit of work is newton metre (Nm). When a force of 1
newton moves a body through a distance of 1m in its own direction, then work
done is known as 1 joule. So, 1 joule = 1 newton 1 metre
1J = 1 Nm
Thus the SI unit of work is joule(J). Work is a scalar quantity.
6. Work Done Against Gravity
Climbing stairs and lifting objects is work in both the scientific and everyday sense—it is work done against
the gravitational force. When there is work, there is a transformation of energy. The work done against the
gravitational force goes into an important form of stored energy that we will explore in this section.
7. Let us calculate the work done in lifting an object of mass m through a height h,
such as in Figure 1. If the object is lifted straight up at constant speed, then the
force needed to lift it is equal to its weight mg. The work done on the mass is then
W = Fd = mgh. We define this to be the gravitational potential energy (PEg
) put into
(or gained by) the object-Earth system. This energy is associated with the state of
separation between two objects that attract each other by the gravitational force.
For convenience, we refer to this as the PEg
gained by the object, recognizing that
this is energy stored in the gravitational field of Earth.
8. Why do we use the word “system”? Potential energy is a property of a system rather than
of a single object—due to its physical position. An object’s gravitational potential is due
to its position relative to the surroundings within the Earth-object system. The force
applied to the object is an external force, from outside the system. When it does positive
work it increases the gravitational potential energy of the system. Because gravitational
potential energy depends on relative position, we need a reference level at which to set
the potential energy equal to 0. We usually choose this point to be Earth’s surface, but
this point is arbitrary; what is important is the difference in gravitational potential energy,
because this difference is what relates to the work done. The difference in gravitational
potential energy of an object (in the Earth-object system) between two rungs of a ladder
will be the same for the first two rungs as for the last two rungs.
9. W=MGH
When the work is done against gravity.
This formula will be used to take out work done when a
body is being lifted
10. Question-
The work done by a force acting obliquely is given by the formula: W = F cos θ
xs.What will happen to the work done if angle θ between the direction of force and
motion of the body is increased gradually? Will, it increases, decrease or remain
constant?
Solution-
As we increase the force’s angle with respect to the direction of motion, less and
less work is done along the direction that we are considering; and more and more
work is being done in another, perpendicular, the direction of motion.