Book a personalised 1:1 class with LearnoHub

Watch VideosNCERT SolutionsRevise NotesSwayamOnline TestSample PapersDPPsAsk QuestionsPrevious Year Papers
Daily Practice Problems
Class 11 Physics
Work Energy and Power
daily practice problem

Question 1.

 

Find the angle between force F = (2i  + 3j  - 4k )unit and displacement d = (3i  + 5j  + 4k )unit. Also, find the projection of F and d.

 

Question 2.

 

A cyclist comes to a skidding stop in 12 m. During this process, the force on the cycle due to the road is 300N and is directly opposed to the motion.

  1. How much work does the road do on the cycle?
  2. How much work does the cycle do on the road?

 

Question 3.

 

Give units, symbol and dimensions for kinetic energy and potential energy.

 

Question 4.

 

A body constrained to move along the z-axis of a coordinate system is subject to a constant force F given by;

F = -2i  + 3j  + 2k  N.

Where i , j , k  are unit vectors along the x-, y- and z-axis of the system respectively. What is the work done by this force in moving the body a distance of 3 m along the z-axis?

 

Question 5.

 

A molecule in a gas container hits a horizontal wall with speed 300 m/s and angle 300 with the normal, and rebounds with the same speed. Is momentum conserved in the collision? Is the collision elastic or inelastic?

 

Question 6.

 

A pump on the ground floor of a building can pump up water to fill a tank of volume 27 m3 in 9 min. If the tank is 30 m above the ground, and the efficiency of the pump is 20%, how much electric power is consumed by the pump?

 

 

 

 

Question 7.

 

The bob of a pendulum is released from a horizontal position. If the length of the pendulum is 2.0 m. What is the speed with which the bob arrives at the lowermost point, given that it dissipated 10% of its initial energy against air resistance?

 

Question 8.

 

A trolley of mass 500 kg carrying a sandbag of 50 kg is moving uniformly with a speed of 30 km/h on a frictionless track. After a while, sand starts leaking out of a hole on the floor of the trolley at the rate of 0.04 kg/s. What is the speed of the trolley after the entire sandbag is empty?

 

Question 9.

 

A bolt of mass 0.5 kg falls from the ceiling of an elevator moving down with an uniform speed of 10 m/s. It hits the floor of the elevator (length of the elevator = 5 m) and does not rebound. What is the heat produced by the impact? Would your answer be different if the elevator were stationary?

 

Question 10.

 

A trolley of mass 300 kg moves with a uniform speed of 48 km/h on a frictionless track. A child of mass 30 kg runs on the trolley from one end to the other (15 m away) with a speed of 5 m/s relative to the trolley in a direction opposite to its motion, and jumps out of the trolley. What is the final speed of the trolley? How much has the trolley moved from the time the child begins to run?

 

Question 11.

 

A bullet of mass 0.015 kg and horizontal speed 55 m/s strikes a block of wood of mass 0.5 kg and instantly comes to rest with respect to the block. The block is suspended from the ceiling by means of thin wires. Calculate the height to which the block rises. Also, estimate the amount of heat produced in the block.

 

Question 12.

 

When will you say that a force is conservative?

Question 13.

 

State Work- Energy theorem.

 

Question 14.

 

A family uses 10 kW of power. Direct solar energy is incident on the horizontal surface at an average rate of 300 W per square meter. If 15% of this energy can be converted to useful electrical energy, how large an area is needed to supply 10 kW?

 

Question 15.

 

Give dimension of spring constant.

 

Question 16.

 

A body of mass 0.3 kg travels in a straight line with velocity, v = ay3/2, where a = 3 m/s2. What is the work done by the net force during its displacement from x = 0 to 3 m.

 

Question 17.

 

How can you write mechanical energy in terms of kinetic and potential energies?

 

Question 18.

 

A rain drop of radius 1 mm falls from a height of 400 m above the ground. It falls with decreasing (due to viscous resistance of the air) until at half its original height. It attains its maximum(terminal) speed, and moves with uniform speed thereafter. What is the work done by the resistive force in the entire journey if its speed on reaching the ground is 15 m/s.

 

Question 19.

 

What are the unit, symbol and dimension of work done?

 

 

 

Question 20.

 

A body constrained to move along the z-axis of a coordinate system is subject to a constant force F is given by:

F = 2i  + 3j  + 4k  N

where i , j  and k  are unit vectors along x, y- and z-axis of the system respectively. What is the work done by this force in moving the body a distance of 5 m along the z-axis?

**********

Problem-solving on Class 11 Physics Work Energy and Power NCERT Chapter 5 after learning a theoretical concept is crucial for several reasons:

  1. Application of Knowledge: Problem-solving allows you to apply the theoretical concepts of the topic Class 11 Physics Work Energy and Power you have learned to real-life situations. It helps you bridge the gap between abstract knowledge and practical scenarios, making the learning more relevant and meaningful.
  2. Understanding Deeper Concepts: When you encounter problems related to a theoretical concept that you learned in Class 11 Physics Work Energy and Power NCERT Chapter 5, you are forced to delve deeper into its intricacies. This deeper understanding enhances your comprehension of the subject and strengthens your grasp of the underlying principles.
  3. Critical Thinking: Problem-solving encourages critical thinking and analytical skills. It requires you to analyze the problem, identify relevant information, and devise a logical solution. This process sharpens your mind and improves your ability to approach complex challenges effectively.
  4. Retention and Recall: Actively engaging in problem-solving reinforces your memory and improves long-term retention. Applying the concepts learned in Work Energy and Power Class 11 Physics in practical scenarios helps you remember them better than passive reading or memorization.
  5. Identifying Knowledge Gaps: When you attempt to solve problems, you may encounter areas where your understanding is lacking. These knowledge gaps become evident during problem-solving, and you can then focus on filling those gaps through further study and practice. You can refer Work Energy and Power Class 11 Physics Notes on LearnoHub.com
  6. Boosting Confidence: Successfully solving problems after learning a theoretical concept boosts your confidence in your abilities to handle Work Energy and Power. This confidence motivates you to tackle more challenging tasks and improves your overall performance in the subject.
  7. Preparation for Exams and Challenges: Many exams, especially in science, mathematics, and engineering, involve problem-solving tasks. Regular practice in problem-solving prepares you to face these exams with confidence and perform well. It is also advised to take tests on Work Energy and Power Class 11 Physics Online Tests at LearnoHub.com.
  8. Enhancing Creativity: Problem-solving often requires thinking outside the box and exploring various approaches. This fosters creativity and innovation, enabling you to come up with novel solutions to different problems.
  9. Life Skills Development: Problem-solving is a valuable life skill that extends beyond academics. It equips you with the ability to tackle various challenges you may encounter in personal and professional life.
  10. Improving Decision Making: Problem-solving involves making decisions based on available information and logical reasoning. Practicing problem-solving enhances your decision-making skills, making you more effective in making informed choices.

In summary, problem-solving after learning a theoretical concept on CBSE Work Energy and Power Class 11 Physics is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.

Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on Class 11 Physics Work Energy and Power NCERT Chapter 5

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 11 Physics Work Energy and Power NCERT Chapter 5 useful.

Last but not least, to get the best hold on Class 11 Physics Work Energy and Power NCERT Chapter 5, do not forget to check out:

  • Work Energy and Power Class 11 Physics Best videos
  • Work Energy and Power Class 11 Physics NCERT Solutions
  • Class 11 Physics Work Energy and Power Revision notes
  • Work Energy and Power Class 11 Physics DPPs, Download PDF of solutions
  • Class 11 Physics Work Energy and Power Online Tests
  • Class 11 Physics Sample papers