EnergyConservation

When your hands are cold, you can rub them together to warm them.

Imagine you are in Disney Land and you are in line to ride their roller coaster. Describe the energy change (kinetic and potential energies) at these three points: a. Starting point b. Highest point of the roller coaster going into the looped portion c. Slowing down of the roller coaster at the end   What type of energy is released when you scream and shout during the ride?

Required information A shooting star is a meteoroid that burns up when it reaches Earth's atmosphere. Many of these meteoroids are quite small. Compare the kinetic energy of a shooting star to that of a moving car. What is the kinetic energy of a meteoroid of mass 5.51 g moving at a speed of 48.0 km/s? MJ

10. Students create an Energy vs. Height graph for a rollercoaster that starts at the top of a hill before going down the hill and back up to a hill of equal height. They labeled each curve or line A, B, or C to represent the different type of energy. XX B Position Which of the following accurately identifies each line by the type of energy that is represented? A. Curve A represents potential energy, Curve B represents kinetic energy, and Line C represents the total energy in the system. B. Curve A represents the total energy in the system, Curve B represents the potential energy, and Line C represents kinetic energy. C. Curve A represents kinetic energy, Curve B represents potential energy, and Line C represents the total energy in the system. D. Curve A represents the total energy in the system, Curve B represents the kinetic energy, and Line C represents the potential energy 20 Energy

Work, Energy, and Power Name: Power Read from Lesson 1 of the Work, Energy and Power chapter at The Physics Classroom: http://www.physicsclassroom.com/Class/energy/u5lle.html MOP Connection: Work and Energy: sublevel 2 Review: 1. A force acting upon an object to cause a displacement is known as energy b. potential c. kinetic d. work a. 2. Two acceptable units for work are a. joule b. newton c. watt d. newton meter Choose two. Power as a Rate Quantity: 3. Power is defined as the is done. a. amount of work which b. direction at which work C. angle at which work d. the rate at which work 4. Two machines (e.g., elevators) might do identical jobs (e.g., lift 10 passengers three floors) and yet the machines might have different power outputs. Explain how this can be so. M

HORSEPOWER LAB Name In this lab you are going to calculate the work you do in climbing bleachers and the power you put out. Most people can maintain about 100 watts of power for about a minute. Procedure: 1. Measure the vertical height of the bleachers by a method of your choice. Record below 2. Determine your weight in Newtons. Record below. 3. Time how long it takes you to run up the bleachers, time to the nearest .1 of second. Record below Data: Height of bleachers 10 feet Your weight Calculations: 1. Find your work, use Work (J) = weight (N) x height (m) wxh Nork= 335.5J 110x3.05 2. Find your power, use Power (W) = work (J)/ time (s) Power = work 335.5 time 1 3. Find your horsepower, use horsepower = watts/746 =47.9 W P= 47.9 =0.064 horsepower 746 4. Describe how you measured the vertical height of the bleachers. 110 Time 6. Why is it more difficult to climb stairs as opposed to walking on level ground? Hr 7 Sec 5. The answer for #3 is probably your maximum horsepower, unless you…

1. sketch a motion diagram of the skater that starts from rest at the location shown.  2. sketch a graph for the change in gravitational potential energy vs. x- position 3. sketch a kinetic energy vs x- position graph.  how does this graph compare to the one in #2. .

d. A 9.2 Work and Kinetic Energy for a Single Particle 2 On the axes below, draw graphs of the kinetic energy of a. A 1000 kg car that uniformly accelerates from 0 to 20 m/s in 20 s. b. A 1000 kg car moving at 20 m/s that brakes to a halt with uniform deceleration in 20 s. c. A 1000 kg car that drives once around a 130-m-diameter circle at a speed of 20 m/s. Calculate K at several times, plot the points, and draw a smooth curve between them. K (J) b. K (J) с. K (J) a. 250,000 250,000 250,000 200,000 200,000 200,000 150,000 150,000 150,000 100,000 100,000 100,000 50,000 50,000 50,000 - t(s) - 1(s) 0+ 0 5 10 15 20 t (s) 04 O 5 04 0 5 10 15 20 10 15 20 Exercises 3-10: For each situation: Draw a before- and-after pictorial representation. .Draw and label the displacement vector Ar. Draw a free-body diagram. . Fill in the table by showing the sign (+, -, or 0) of the quantities listed. 3. An elevator moves up at constant speed. ten W grav

Mini Task 1: Design a Roller coaster by accessing this link: https://www.learner.org/series/interactive-amusement-park-physics/ Have a picture or screen shot of your designed roller coaster. Answer the following questions: a. Where is the potential energy greatest? b. Where is the kinetic energy greatest? c. If the acceleration due to gravity value of 9.8 m/s/s is used along with an estimated mass of 500kg for the coaster car, the kinetic energy and potential energy and total mechanical energy can be determined. What is the total mechanical energy of the car at any point along the track (first hill, second hill)?

Answer the following questions based in Energy Skate Park Experiment: 1. Is the mechanical energy conserved between A and B? Explain 2. Is the mechanical energy conserved between B and C? Explain

ACTIVITY 1: IDENTIFICATION & CLASSIFICATION A Identify whether the following has Potential or Kinetic Energy. Write the number in each corresponding column. 1. A mango fruit high up in a tree 6. A jeepney traveling down the road 2. A ball rolling down a hill 7. A paper airplane flying through the air 3. A large stick of dynamite 8. An asteroid falling towards the earth 4. A stretched rubber band 9. Standing on the stage Potential Energy Kinetic Energy B. Classify whether the description describe about Potential Energy (PE or Kinetic Energy (KE). Write PE or KE in the space provided. 1. Energy possessed by a moving tricycle. 2. Energy that is being used. 3. Energy due to the position of an object. 4. Energy waiting to be used momlator Smotaya 16

Lili pulls a 6.00-kg crate across a horizontal floor for a distance of 3.00 m as shown. The tension force in the rope is 86 N and the angle is 30.0° with respect to the horizontal. The frictional force on the crate is 12.0 N. Assuming the system is crate+earth+floor, match the answers with questions. C. D. What is the change in gravitational potential energy (AUg)? What is the change in thermal energy (AEth)? What is the work done by the friction force? What is the work done by you (Wext)? A. -259 J B. -187 J C. 36 J D.-36 J E. -223 J F. none of the given G. 259 J H.O J 1. 223 J

Work And Energy Problem Solving 5. Initially at rest, a block with a mass of 6 kg above a frictionless surface is pulled to the right along the horizontal with a force of 12 N. How much work is done by the force after it has moved 3 m? 6. Initially at rest, a block with a mass of 6 kg above a frictionless surface is pulled to the right along the horizontal with a force of 12 N. What is the velocity of the block after it has moved 3 m?

THUMBS-UP WILL BE GIVEN! WRITE THE COMPLETE SOLUTIONS (2 DECIMAL PLACES with units) CALCULUS-BASED PHYSICS Assume that you are a professional mechanic, in your workplace 1 800-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.80 m before coming into contact with the top of the beam, and it drives the beam 11.0 cm farther into the ground before coming to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.

Instructions 1. Write your complete solution for each item. It should be handwritten. 2. Make sure to simplify your answers and box/underline/highlight your final answer. A. Solve the following problems. 17F1 3.) The natural length of a spring is 8 inches. A force of 20 lb stretches the spring to 10 in. Find the work done in stretching the spring from its natural length to 12 in.

choose all that apply to work energy theorem   A. work done is zero then Kinetic energy stays same .   B. work done equals the change in kinetic energy. X   C. work done is negative then kinetic energy decreases.   D. work done is zero then kinetic energy is zero.   I had B, C, and D but it is wrong

Please help me with this question and show all steps. Please identify the relevant physical principles and summarize them in words. Also, can you draw an energy diagram for the object(s) in motion while moving in the loop? Include total energy, potential energy and kinetic energy. Please be aware of all the other components of the graph too. I JUST NEED C AND D

1 A ball is initially at rest at the top of a hill. It starts to roll down. Which statementis true? a. Total energy at top is greaterthan total energy at bottom b. Total energy at bottom is greater than total energy at the top C. Total energy at the top is equal to the total energy at the bottom d. Notenough information to answer EXPLAIN your answer 1.

Situation 1 Kenneth and Lance are twin brothers with exactly the same physical attributes including their mass. They are in the water park to enjoy the summer. In the pool area where they are having fun, there are two slides. Kenneth decided to take the 8-m high slide while Lance tried the slide with a height of 5 m. Who did more work as they use the slides? Explain your answer. A. Complete these two sentences by rewriting them here in the answer section. Before, I thought that WORK is Now, I know that WORK is...

Guided Practice 1. Two physics students, A and B are in the weightlifting room. Student A lifts the 100-N barbell over his head 10 times in one minute. Student B lifts the 100-Newton barbell over his head 10 times in 10 seconds. a. Which student does the most work? None because both students do the same amount of work lifting the same 100N barbell 10 times. b. Which student delivers the most power and why? Explain your answers. Student B delivers the most power because he does the same amount of work in a shorter time.

Snapshot[1, 2 or 3] Energy Bar Chart A Your explanation here Constructed Response #2 The students measure the kinetic energy, Total Gravitational Potential Kinetic gravitational potential energy, and total energy Energy Bar Chart B of the ball at the three Snapshot[1, 2 or 3] points shown in the Your explanation here snapshots. Each bar chart below represents the energies for the bowling ball at one of the Gravitational Potential Kinetic Total snapshots on the previous slide. Energy Bar Chart C c. Match each snapshot Snapshot [1, 2 or 3] to an energy bar chart. For each, explain your Your explanation here reasoning in complete sentences. Gravitational Potential Kinetic Total

HORSEPOWER LAB Name In this lab you are going to calculate the work you do in climbing bleachers and the power you put out. Most people can maintain about 100 watts of power for about a minute. 3 Data: Height of bleachers Procedure: 1. Measure the vertical height of the bleachers by a method of your choice. Record below 2. Determine your weight in Newtons. Record below. 3. Time how long it takes you to run up the bleachers, time to the nearest .1 of second. Record below 10 feet Your weight Calculations: 1. Find your work, use Work (J) = weight (N) x height (m) 2. Find your power, use Power (W) = work (J) / time (s) 3. Find your horsepower, use horsepower = watts / 746 4. Describe how you measured the vertical height of the bleachers. lla Hr Time 6. Why is it more difficult to climb stairs as opposed to walking on level ground? 7 Sec 5. The answer for #3 is probably your maximum horsepower, unless you just strolled up the stairs. Explain if your value would be higher or lower if you ran…

Using the principles of energy and conservation of energy, determine how the velocity of an object at the bottom of a ramp is related to its initial starting height. 1. If the ball is initially motionless at the top of a ramp of height h, write down expressions for the initial kinetic, potential, and total energy of the ball. 2. What expressions for the kinetic, potential, and total energy of the ball as it reaches the bottom of the ramp. 3. Using the principle of conservation of energy, what expression relates the final velocity of the ball to its initial height on the ramp.