Work and energy practice problems with answers

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# Work and energy practice problems with answers

As KE increases, another form of energy must decrease. As KE increases, other forms of energy also increase. KE remains relatively stable in a closed loop. KE has a limited effect upon wavelength. Which of the following is the correct expression for work? A spring has a spring constant of newtons per meter.

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How much potential energy is stored in the spring as it is stretched. A distance of 1. The electric field intensity between the bottom of the cloud and the ground is What is the potential difference between the bottom of the cloud and the ground? When Adam drinks cold water, his body warms the water until thermal equilibrium is reached. If he drinks six glasses 2. An electron is located between a pair of oppositely charged parallel plates.

As the electron approaches the positively charged plate, the kinetic energy of the electron? If the speed of a moving object is doubled, which quantity also associated with the object must double? A 45 kilogram bicyclist climbs a hill at a constant speed of 2. Approximately how much power does the bicyclist develop? A person kicks in a 4. What is the magnitude of the force exerted by the door on the person?

A 60 kilogram student running at 3. How much work is done in moving 5. How much time is required for an operating W light bulb to dissipate 10 Joules of electrical energy?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 forcethere will be a change in the total mechanical energy of the object.

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If only internal forces are doing work no work done by external forcesthere 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.

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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.

### Work Power Energy Exam2 Problems and Solutions

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.

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The car skids m.Work is done when an object moves in the same direction, while the force is applied and also remains constant. Refer the below work physics problems with solutions and learn how to calculate force, work and distance.

Let us consider the work example problem: A train covers a distance of 15 km and that the force is causing it to accelerate at a rate of 0. Calculate the work done? Refer the below work physics problem with solution for a boy who uses a force of 30 Newtons to lift his grocery bag while doing 60 Joules of work. How far did he lift the grocery bags? Refer the below work sample problem with answer for the baseball player who does Joules of work when hitting a baseball into field.

The baseball reached meters away. Calculate the force used to hit the ball? Work Example Problems Example 1: Let us consider the work example problem: A train covers a distance of 15 km and that the force is causing it to accelerate at a rate of 0.

### Power Problems in Physics

Solution: We can calculate force, work and distance using the given formula. Calculators and Converters.Answers to the Above questions. Physics Problems with Solutions. Sat Physics subject questions on energy, work and power, with detailed solutions, similar to the questions in the SAT test are presented.

Calculate the maximum height reached by the ball before it returns to the ground.

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Approximate the total work done by the force shown in the graph "force versus distance" on the right? At time t2 it reaches a maximum height and heads downward. At time t3 it is at height equal to the height of the building. At time t4, it is at a height equal to half the height of the building.

It hits the ground at time t5. At what time is the potential energy of the ball maximum and it kinetic energy equal to zero? A t1 B t2 C t3 D t4 E t5 What is the power needed to lift a box of Kg to a height of 20 meters, at a constant speed, in 20 seconds?

A 20, w B w C w Dw E 2 w A ball is thrown upward at time t1 from the top of a building. In which interval of time is the potential energy of the ball increasing while its kinetic energy is decreasing? A t1t2 B t2t3 C t3t4 D t4t5 E t3t5 The mass m and velocity v of each of 5 moving objects are given below. Which one has the highest kinetic energy? Find mass M.Mr Trask's Physics.

Work and Energy Physics Problems - Basic Introduction

Search this site. Unit 0 - Introduction. Unit 1 - Kinematics in 1D. Unit 2 - Kinematics in 2D. Unit 3 - Dynamics. Unit 4 - Momentum and Energy. Unit 5 - Circular Motion and Gravitation. Unit 6 - Equilibrium. Unit 7 - Rotational Dynamics.

Unit 9 - Electric Circuits. Unit 1 - Electrostatics. Unit 2 - RC Circuits. Unit 3 - Electromagnetism. Unit 4 - Fluid Mechanics. Unit 5 - Thermodynamics. Unit 6 - Waves and Optics. Unit 7 - Nuclear and Quantum.

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Unit 8 - Review. Unit 1. Unit 2. Unit 3. Unit 4. Unit 5. Unit 6.

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Unit 7. Unit 8. Year End Review.Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a work out. They apply a cumulative force of N to push the car m to the nearest fuel station.

Determine the work done on the car. Hans Full is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and rightwards with a force of Determine the work in Joules done upon the backpack. Lamar Gant, U. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting kg to a height of 0. Sheila has just arrived at the airport and is dragging her suitcase to the luggage check-in desk.

## Work Physics Problems with Solutions

Determine the work done by Sheila on the suitcase. While training for breeding season, a gram male squirrel does 32 pushups in a minute, displacing its center of mass by a distance of 8. Determine the total work done on the squirrel while moving upward 32 times. During the Powerhouse lab, Jerome runs up the stairs, elevating his kg body a vertical distance of 2.

Determine the work done by Jerome in climbing the stair case. Determine the power generated by Jerome. A new conveyor system at the local packaging plan will utilize a motor-powered mechanical arm to exert an average force of N to push large crates a distance of 12 meters in 22 seconds.

Determine the power output required of such a motor. The Taipei in Taiwan is a foot tall, story skyscraper. The elevators transport visitors from the ground floor to the Observation Deck on the 89th floor at speeds up to Answers to the Above questions. Physics Problems with Solutions. Sat Physics subject questions on energy, work and power, with detailed solutions, similar to the questions in the SAT test are presented.

Calculate the maximum height reached by the ball before it returns to the ground. More Info. Popular Pages Home. All rights reserved. Privacy Policy. Approximate the total work done by the force shown in the graph "force versus distance" on the right? At time t2 it reaches a maximum height and heads downward.

At time t3 it is at height equal to the height of the building. At time t4, it is at a height equal to half the height of the building. It hits the ground at time t5. At what time is the potential energy of the ball maximum and it kinetic energy equal to zero?

A t1 B t2 C t3 D t4 E t5 What is the power needed to lift a box of Kg to a height of 20 meters, at a constant speed, in 20 seconds? A 20, w B w C w Dw E 2 w A ball is thrown upward at time t1 from the top of a building. In which interval of time is the potential energy of the ball increasing while its kinetic energy is decreasing? A t1t2 B t2t3 C t3t4 D t4t5 E t3t5 The mass m and velocity v of each of 5 moving objects are given below.

Which one has the highest kinetic energy? Find mass M. 