Work Energy and Power - Video
9868233590Work Energy and Power - Video Lecture
More Physics Free Demo Videos
Introduction
0:00
Work,Energy & Power
0:38
Scalar Product
2:49
Definition of Work
11:55
Work:Examples
13:22
Work done =0:Examples
14:24
Positive and Negative Work
15:24
Work done:Force -Displacement graphs
17:49
Problem 1
20:01
Kinetic Energy
24:01
Work-Energy Theorem
27:39
Work done by a variable force
28:12
Potential Energy
29:30
Potential Energy: Relation Force & Work done
35:59
Conservative & Non-Conservative forces
37:59
Conservation of Mechanical energy
38:59
Plot of Fs Vs. Displacement
46:40
Work done in a spring
49:52
Conservation of Mechanical energy in a spring
54:26
Energy vs. Displacement plot for a spring
57:54
Problem 1
59:22
Problem 2
1:00:23
Forms of energy & Interconversions
1:02:27
Conservation of energy
1:04:14
Power
1:04:41
Average & Instantaneous Power
1:06:13
Power
1:09:35
Problem 1
1:10:25
Problem 2
1:12:59
What is collision
1:16:07
Momentum & Energy conservation in collision
1:16:44
Types of collision
1:17:24
Collision in 1 Dimension:Inelastic collision
1:20:10
Collision in 1 Dimension:Elastic collision
1:24:18
Elastic collision
1:31:02
Collision in 2 Dimension
1:32:08
Problem 1
1:36:49
System of Particles and Rotational Motion
Class 11 Physics Video (Go Main Menu)
NEET / CBSE / NCERT / ICSE
Physics
Work Energy and Power-Video Lecture
Related Topics
Motion in a straight line
Work Energy and Power-Video Lecture
Chemical Bonding & Molecular Structure
System of Particles and Rotational Motion
Overview
Work Energy and Power Class 11 Physics NCERT Chapter 5
Unit of Work
The SI unit of work is Joule (J). For example, if a force of 5 newtons is applied to an object and moves 2 meters, the work done will be 10 newton-meter or 10 Joule. It should be noted that 1 J = 1 N ⋅ m = 1 kg ⋅ m2/s2.
Example of Work
An object is horizontally dragged across the surface by a 100 N force acting parallel to the surface. Find out the amount of work done by the force in moving the object through a distance of 8 m.
Solution:
Given:
F = 100 N, d = 8 m
Since F and d are in the same direction, θ = 0, [θ is the angle of the force to the direction of movement], therefore
W = FdCos θ
W = 100 x 8 x Cos 0
W = 800 J [Since Cos 0 = 1]
What is Energy?
Energy is the ability to perform work. Energy can neither be created nor destroyed, and it can only be transformed from one form to another. The unit of Energy is the same as of Work, i.e. Joules. Energy is found in many things, and thus there are different types of energy.
All forms of energy are either kinetic or potential. The energy in motion is known as Kinetic Energy, whereas Potential Energy is the energy stored in an object and is measured by the amount of work done.
Types of Energy
Some other types of energy are given below:
- Mechanical energy
- Mechanical wave energy
- Chemical energy
- Electric energy
- Magnetic energy
- Radiant energy
- Nuclear energy
- Ionization energy
- Elastic energy
- Gravitational energy
- Thermal energy
- Heat Energy
Unit of Energy
The SI unit of energy is Joules (J), named in honour of James Prescott Joule.
What is Power?
Power is a physical concept with several different meanings, depending on the context and the available information. We can define power as the rate of doing work, and it is the amount of energy consumed per unit of time.
Formula of Power
As discussed, power is the rate of doing work. Therefore, it can be calculated by dividing work done by time. The formula for power is given below.
|
Where, P is the power, W is the work done and t is the time taken.
Unit of Power
As power doesn’t have any direction, it is a scalar quantity. The SI unit of power is Joules per Second (J/s), which is termed as Watt. Watt can be defined as the power needed to do one joule of work in one second. The unit Watt is dedicated in honour of Sir James Watt, the developer of the steam engine.
Read the article below to learn the SI unit of power in detail.
Example of Power
A garage hoist lifts a truck up 2 meters above the ground in 15 seconds. Find the power delivered to the truck. [Given: 1000 kg as the mass of the truck]
First we need to calculate the work done, which requires the force necessary to lift the truck against gravity:
F = mg = 1000 x 9.81 = 9810 N.
W = Fd = 9810N x 2m = 19620 Nm = 19620 J.
The power is P = W/t = 19620J / 15s = 1308 J/s = 1308 W.
Work, Power and Energy Questions
- What is the relationship between work, energy and power?
- What happens to the energy as work is done?
- What is the difference between work, energy and power?
- Is energy transferred the same as work done?
- How does work affect an object’s energy?
- How are work, energy and power related to each other?
- How are force, energy and work related?
- What is the formula of work, energy and power?
- How do you calculate energy from power?
- Can force be converted into energy?
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We also cover
1. What is the work that must be done to stop a lorry of mass 4000kg moving at a velocity of 54km/hr in 2 seconds?
2. A body of mass 20 kg is moving with a constant velocity of 100m/s at a height 200m above the ground. Calculate its total energy.
3. A body of mass 200kg is projected vertically upwards with a velocity of 300m/s. Assuming that all its kinetic energy is converted into potential energy, Calculate the maximum height reached by it.
4. A crane with a 10kW engine lifts a load at a constant velocity of 60m/min. What is the mass of the load? Assume 100% efficiency for the crane’s engine.
5. A car of mass 3 * 103 kg travelling at 36 km/hr is brought to rest at a distance of 100m. Calculate the power required to do so.
6. A cart is moving over a horizontal surface at a velocity of 50 cm/sec. It is hit by another cart which is moving in the same direction at a velocity of 150cm/s. After collision the carts continue to move in the same direction at the same velocity of 100 cm/s. Find the ratio of the masses of the carts.
7. NCERT notes class 11 physics Work,Power & Energy
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10. NCERT class 11 physics chapter 6 Work,Power and Energy
11. NCERT solutions class 11 physics chapter 6 Work,Power and Energy
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Below topics are covered in this video
Introduction
0:00
Work,Energy & Power
0:38
Scalar Product
2:49
Definition of Work
11:55
Work:Examples
13:22
Work done =0:Examples
14:24
Positive and Negative Work
15:24
Work done:Force -Displacement graphs
17:49
Problem 1
20:01
Kinetic Energy
24:01
Work-Energy Theorem
27:39
Work done by a variable force
28:12
Potential Energy
29:30
Potential Energy: Relation Force & Work done
35:59
Conservative & Non-Conservative forces
37:59
Conservation of Mechanical energy
38:59
Plot of Fs Vs. Displacement
46:40
Work done in a spring
49:52
Conservation of Mechanical energy in a spring
54:26
Energy vs. Displacement plot for a spring
57:54
Problem 1
59:22
Problem 2
1:00:23
Forms of energy & Interconversions
1:02:27
Conservation of energy
1:04:14
Power
1:04:41
Average & Instantaneous Power
1:06:13
Power
1:09:35
Problem 1
1:10:25
Problem 2
1:12:59
What is collision
1:16:07
Momentum & Energy conservation in collision
1:16:44
Types of collision
1:17:24
Collision in 1 Dimension:Inelastic collision
1:20:10
Collision in 1 Dimension:Elastic collision
1:24:18
Elastic collision
1:31:02
Collision in 2 Dimension
1:32:08
Problem 1
1:36:49
