 # Kinetic And Potential Energy Questions And Answers Pdf

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Lesson 2 has thus far focused on how to analyze motion situations using the work and energy relationship. The relationship could be summarized by the following statements:. There is a relationship between work and mechanical energy change.

Whenever work is done upon an object by an external or nonconservative force , there will be a change in the total mechanical energy of the object. If only internal forces are doing work no work done by external forces , there is no change in total mechanical energy; the total mechanical energy is said to be "conserved.

Now an effort will be made to apply this relationship to a variety of motion scenarios in order to test our understanding. Use your understanding of the work-energy theorem to answer the following questions. Then click the button to view the answers. Consider the falling and rolling motion of the ball in the following two resistance-free situations. In one situation, the ball falls off the top of the platform to the floor. In the other situation, the ball rolls from the top of the platform along the staircase-like pathway to the floor.

For each situation, indicate what types of forces are doing work upon the ball. Indicate whether the energy of the ball is conserved and explain why. Finally, fill in the blanks for the 2-kg ball. Since it is an internal or conservative force, the total mechanical energy is conserved. Thus, the J of original mechanical energy is present at each position. And so the kinetic energy at the bottom of the hill is J G and J. The answers given here for the speed values are presuming that all the kinetic energy of the ball is in the form of translational kinetic energy.

In actuality, some of the kinetic energy would be in the form of rotational kinetic energy. Thus, the actual speed values would be slightly less than those indicated. Rotational kinetic energy is not discussed here at The Physics Classroom Tutorial. If frictional forces and air resistance were acting upon the falling ball in 1 would the kinetic energy of the ball just prior to striking the ground be more, less, or equal to the value predicted in 1?

The kinetic energy would be less in a situation that involves friction. Friction would do negative work and thus remove mechanical energy from the falling ball. The answer is D. The total mechanical energy i. The answer is B. The PE is a minimum when the height is a minimum. Position B is the lowest position in the diagram. The answer is C. Since the total mechanical energy is conserved, kinetic energy and thus, speed will be greatest when the potential energy is smallest.

Point B is the only point that is lower than point C. The reasoning would follow that point B is the point with the smallest PE, the greatest KE, and the greatest speed. Therefore, the object will have less kinetic energy at point C than at point B only. Many drivers' education books provide tables that relate a car's braking distance to the speed of the car see table below. Utilize what you have learned about the stopping distance-velocity relationship to complete the table.

The car skids m. Thus, there must be a nine-fold increase in the stopping distance. Multiply 15 meters by 9. Two baseballs are fired into a pile of hay. If one has twice the speed of the other, how much farther does the faster baseball penetrate? Assume that the force of the haystack on the baseballs is constant.

When there is a two-fold increase in speed, there is a four-fold increase in stopping distance. For constant resistance forces, stopping distance is proportional to the square of the speed.

Use the law of conservation of energy assume no friction to fill in the blanks at the various marked positions for a kg roller coaster car. If the angle of the initial drop in the roller coaster diagram above were 60 degrees and all other factors were kept constant , would the speed at the bottom of the hill be any different?

The angle does not affect the speed at the bottom of the incline. The speed at the bottom of the incline is dependent upon the initial height of the incline. Many students believe that a smaller angle means a smaller speed at the bottom. But such students are confusing speed with acceleration.

A smaller angle will lead to a smaller acceleration along the incline. An object which weighs 10 N is dropped from rest from a height of 4 meters above the ground. Energy is conserved in free-fall situations no external forces doing work. Thus, the total mechanical energy initially is everywhere the same.

Whatever total mechanical energy TME it has initially, it will maintain throughout the course of its motion.

The object begins with Observe that a confusion of mass 1 kg and weight 9. During a certain time interval, a N object free-falls 10 meters.

The total amount of mechanical energy is conserved in free-fall situations no external forces doing work. Thus, the potential energy that is lost is transformed into kinetic energy. A rope is attached to a A diagram of the situation and a free-body diagram are shown below. Note that the force of gravity has two components parallel and perpendicular component ; the parallel component balances the applied force and the perpendicular component balances the normal force.

Both gravity and applied forces do work. The normal force does not do work since the angle between F norm and the displacement is 90 degrees. If necessary, review the lesson on work. Based upon the types of forces acting upon the system and their classification as internal or external forces, is energy conserved? The applied force is an external or nonconservative force.

And since it does work, the total mechanical energy is not conserved. Thus, both KE terms can be eliminated from the equation. Physics Tutorial. What Can Teachers Do My Cart Subscription Selection. Student Extras. Internal vs. See Answer The kinetic energy would be less in a situation that involves friction. See Answer The answer is B. A two-fold increase in speed means a four-fold increase in stopping distance. Multiply 27 by 4.

B: 60 ft Compare 60 mph to 30 mph - a two-fold decrease in speed. A two-fold decrease in speed means a four-fold decrease in stopping distance. Divide by 4. Divide 27 by 4. We Would Like to Suggest Sometimes it isn't enough to just read about it. You have to interact with it! And that's exactly what you do when you use one of The Physics Classroom's Interactives.

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These solutions for Work And Energy are extremely popular among Class 9 students for Science Work And Energy Solutions come handy for quickly completing your homework and preparing for exams. Write detailed answers? Explain the difference between potential energy and kinetic energy. Derive the formula for the kinetic energy of an object of mass m, moving with velocity v. Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy. Determine the amount of work done when an object is displaced at an angle of 30 o with respect to the direction of the applied force. If an object has 0 momentum, does it have kinetic energy? ## Application and Practice Questions

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Unit iv worksheet 1 physics answers. Distance is the unit of lengthin physics 1 unit of distance is 1 unit of speed into 1 unit of timethat means 1. Name date pd unit wei. Worksheet 1 assume that the car shown below is going at a constant speed v

What is the energy in electron-volts eV of a 4. The rate at which you do the work is your power output. This fact is referred to as the Work-Energy Principle and is often a very useful tool in mechanics problem solving. In Physics, power is associated with energy and has a precise meaning.

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#### kinetic and potential energy multiple choice questions

Lesson 2 has thus far focused on how to analyze motion situations using the work and energy relationship. The relationship could be summarized by the following statements:. There is a relationship between work and mechanical energy change. Whenever work is done upon an object by an external or nonconservative force , there will be a change in the total mechanical energy of the object. If only internal forces are doing work no work done by external forces , there is no change in total mechanical energy; the total mechanical energy is said to be "conserved. Now an effort will be made to apply this relationship to a variety of motion scenarios in order to test our understanding.

Water at the top of a waterfall. Click on the Calculate button of the unknown value. Tables on worksheet plus graph to plot. Figure 1 Use this figure to answer questions 6,7, and 8. Some of the worksheets for this concept are Kinetic or potential energy, Kinetic and potential energy work name date, What is energy, Kinetic and potential energy work, Rule for kinetic energy, Kmbt , 8th grade science energy unit information, Name period date. The increases in the kinetic energy are equal to the decrease in the electric potential energy of the system. What you need to know about Kinetic Energy depends on the paper you are sitting at the time.

You serve a volleyball with a mass of 2. Potential Vs Kinetic Energy Worksheet Answers New Collection from kinetic and potential energy problems worksheet answers , source:thebruisers. Whatever your business planning objectives, cash flow remains the most essential resource in the company, and cash is the one small business purpose. Do this by writing in-creasing, decreasing or constant under the headings gravitational potential energy, kinetic energy and elastic potential energy in the table below. Awaiting ae recommendation to awaiting reviewer scores. Potential energy is converted into kinetic energy.

B Small stagnant pools do not provide enough water to dilute the toxic ammonia. Человек, сидевший рядом, посмотрел на него в недоумении: так не принято было вести себя в храме Божьем. - Enferno, - извиняясь, сказал Беккер.  - Я плохо себя чувствую.

Что с тобой? - в голосе Стратмора слышалась мольба. Лужа крови под телом Хейла расползалась на ковре, напоминая пятно разлитой нефти. Стратмор смущенно посмотрел на труп, затем перевел взгляд на Сьюзан.

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