Work, Energy and Power
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6.3 Given in Fig. 6.11 are examples of some potential energy functions in one dimension. The total energy of the particle is indicated by a cross on the ordinate axis. In each case, specify the regions, if any, in which the particle cannot be found for the given energy. Also, indicate the minimum total energy the particle must have in each case. Think of simple physical contexts for which these potential energy shapes are relevant.
6.3 Given in Fig. 6.11 are examples of some potential energy functions in one dimension. The total energy of the particle is indicated by a cross on the ordinate axis. In each case, specify the regions, if any, in which the particle cannot be found for the given energy. Also, indicate the minimum total energy the particle must have in each case. Think of simple physical contexts for which these potential energy shapes are relevant.
6.3 We know the total energy E is given by E = Kinetic energy (KE) + Potential energy (PE)
(a) In figure (a), we have at x=0, the potential energy is zero. So KE is positive. At x>a, the potential energy has a value greater than E, so the KE becomes 0. Thus the particle will not exist in the region
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6.2 A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7 N on a table with coefficient of kinetic friction = 0.1.
Compute the
(a) Work done by the applied force in 10 s
(b) Work done by friction in 10 s
(c) Work done by the net force on the body in 10 s
(d) Change in kinetic energy of the body in 10 s, and interpret your results
6.2 A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7 N on a table with coefficient of kinetic friction = 0.1.
Compute the
(a) Work done by the applied force in 10 s
(b) Work done by friction in 10 s
(c) Work done by the net force on the body in 10 s
(d) Change in kinetic energy of the body in 10 s, and interpret your results
6.2 Given, mass of the body, m = 2 kg
Horizontal force applied, F = 7 N
Coefficient of friction, = 0.1
Acceleration, a = F/m = 7/2 = 3.5 m/s2
Frictional force, f = 0.1 1.96 N
Retardation produced by the frictional force, = -f/m = -1.96 /2 = 0.98 m/s2
The net acc
Upvote 6.1 The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:
(a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket
(b) Work done by gravitational force in the above case
(c) Work done by friction on a body sliding down an inclined plane
(d) Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity
(e) Work done by the resistive force of air on a vibrating pendulum in bringing it to rest
6.1 The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:
(a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket
(b) Work done by gravitational force in the above case
(c) Work done by friction on a body sliding down an inclined plane
(d) Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity
(e) Work done by the resistive force of air on a vibrating pendulum in bringing it to rest
6.1 (a) While the person lifts a bucket out of a well by means of a rope tied to the bucket, the direction of both the force and the displacement are same, hence the work done is positive.
(b) While lifting the bucket, he works against gravity, but the work done by the gravitational forc
Upvote What are conservative and non-conservative forces in Chapter 5 Work, Energy and Power?
Conservative forces (like gravity or spring force) conserve mechanical energy and do not depend on the path taken. The work done by the conservative forces is recoverable.
Non-conservative forces (like friction or air resistance) dissipate energy as heat or sound. It depends on the path. When non-con
Upvote What is the difference between energy and power in Class 11 Physics Chapter 5 Work, Energy and Power?
Energy is measured in joules (J). It is the capacity to do work while power is the rate of using energy or doing work. Power is measured in watts (W). One watt equals one joule per second. Power talks about how fast the work is done, and energy is about how much work is possible.
Upvote What is the work-energy theorem in Physics Work, Energy and Power?
The work-energy theorem in Physics Work, Energy and Power refers to that net work done on an object is equal to its change in kinetic energy. The following is the formula:
Work-energy theorem means that when work is done on an object, the object gains kinetic energy and when an object does the work,
Upvote What are the different types of energy in Class 11 Physics Chapter 5 Work, Energy and Power?
Energy in Physics means the ability to do work and it can exist in different forms:
- Kinetic Energy (? ) – It is the energy of a moving object. The formulae are KE=1/2mv2
- Potential Energy (PE) - It is stored energy due to position. Formulae are PE=mgh for gravitational potential energy.
- Mechanical Energ
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