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Work, Energy & Power PPT Physics Class 11

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Work ,Energy and Power
Introduction
We use the words work, energy and power in our day-to-day life
often.
Page 2


Work ,Energy and Power
Introduction
We use the words work, energy and power in our day-to-day life
often.
Work ,Energy and Power
However, their meaning differ from the meaning we get from
scientific definitions.
Page 3


Work ,Energy and Power
Introduction
We use the words work, energy and power in our day-to-day life
often.
Work ,Energy and Power
However, their meaning differ from the meaning we get from
scientific definitions.
Scalar product
The scalar product or dot product of any two vectors A and B, denoted as A.B
(Read A dot B) is defined as , where q is the angle between the two vectors.
A, B and cos 8 are scalars, the dot product of A and B is a scalar quantity. Both
vectors, A and B, have a direction but their scalar product does not have a
direction.
B is the product of the magnitude of A and the component of B along A.
Alternatively, it is the product of the magnitude of B and the component of A
along B.
Scalar Product
Page 4


Work ,Energy and Power
Introduction
We use the words work, energy and power in our day-to-day life
often.
Work ,Energy and Power
However, their meaning differ from the meaning we get from
scientific definitions.
Scalar product
The scalar product or dot product of any two vectors A and B, denoted as A.B
(Read A dot B) is defined as , where q is the angle between the two vectors.
A, B and cos 8 are scalars, the dot product of A and B is a scalar quantity. Both
vectors, A and B, have a direction but their scalar product does not have a
direction.
B is the product of the magnitude of A and the component of B along A.
Alternatively, it is the product of the magnitude of B and the component of A
along B.
Scalar Product Scalar Product
Notions of Work and Kinetic Energy
The work-energy theorem states that the change in kinetic energy
of a particle is equal to the work done on it by the net force.
Kf - Ki = W
We know the equation in 3D:
v² - u² = 2ad (where u = initial velocity, v = final velocity, a =
acceleration, d = displacement)
Now multiplying the equation by m/2, we have:
(1/2)mv² - (1/2)mu² = Fd (Since ma = F)
Page 5


Work ,Energy and Power
Introduction
We use the words work, energy and power in our day-to-day life
often.
Work ,Energy and Power
However, their meaning differ from the meaning we get from
scientific definitions.
Scalar product
The scalar product or dot product of any two vectors A and B, denoted as A.B
(Read A dot B) is defined as , where q is the angle between the two vectors.
A, B and cos 8 are scalars, the dot product of A and B is a scalar quantity. Both
vectors, A and B, have a direction but their scalar product does not have a
direction.
B is the product of the magnitude of A and the component of B along A.
Alternatively, it is the product of the magnitude of B and the component of A
along B.
Scalar Product Scalar Product
Notions of Work and Kinetic Energy
The work-energy theorem states that the change in kinetic energy
of a particle is equal to the work done on it by the net force.
Kf - Ki = W
We know the equation in 3D:
v² - u² = 2ad (where u = initial velocity, v = final velocity, a =
acceleration, d = displacement)
Now multiplying the equation by m/2, we have:
(1/2)mv² - (1/2)mu² = Fd (Since ma = F)
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FAQs on Work, Energy & Power PPT Physics Class 11

1. What is work in relation to energy and power?
Ans. Work is defined as the transfer of energy that occurs when a force is applied to an object and the object is displaced in the direction of the force. In the context of energy and power, work is the measure of how much energy is transferred or transformed.
2. How is energy related to work and power?
Ans. Energy and work are closely related concepts. Work is the transfer or transformation of energy, meaning that work is required to transfer energy from one form to another. Power, on the other hand, is the rate at which work is done or energy is transferred.
3. What is the formula for calculating work?
Ans. The formula for calculating work is W = F * d * cosθ, where W represents work, F represents the force applied to an object, d represents the displacement of the object, and θ represents the angle between the force and displacement vectors.
4. How is power calculated?
Ans. Power is calculated using the formula P = W/t, where P represents power, W represents work, and t represents the time taken to perform the work. Power is a measure of how quickly work is done or energy is transferred.
5. What are some examples of different forms of energy?
Ans. There are various forms of energy, including kinetic energy (energy of motion), potential energy (stored energy), thermal energy (heat energy), chemical energy (energy stored in chemical bonds), electrical energy (energy of electric charges), and nuclear energy (energy stored in atomic nuclei).
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