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Do Now What is the difference between kinetic and potential energy?

Published byChristina Jennings Modified over 8 years ago

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Presentation on theme: "Do Now What is the difference between kinetic and potential energy?"— Presentation transcript:

1 Do Now What is the difference between kinetic and potential energy? What is the difference between elastic potential energy and gravitational potential energy? What type of energy does a ball falling through the air have?

2 Today’s Agenda Do Now Important Dates Energy Review Energy Practice
5 min Do Now Important Dates 10 min Energy Review 35 min Energy Practice Exit Ticket

3 Today’s Agenda Do Now Important Dates Energy Review Energy Practice
5 min Do Now Important Dates 10 min Energy Review 35 min Energy Practice Exit Ticket

4 Important Dates and Reminders
Progress Reports Tomorrow Grades updated in TeacherEase Lab Tomorrow College Trips Next one is Ole Miss on Feb. 23  Extra Credit Fundraising Ideas? Meet during 6th period Today & Tomorrow! Attend the hip hop theatre show next Thursday! Last Home Basketball Game Today vs. MAHS!

5 Today’s Agenda Do Now Important Dates Energy Review Energy Practice
5 min Do Now Important Dates 10 min Energy Review 35 min Energy Practice Exit Ticket

6 Kinetic vs. Potential Energy
Kinetic Energy Potential Energy Energy of motion Stored energy

7 Gravitational Potential Energy
This type of potential energy is the energy stored in an object as a result of its height above the ground.

8 Gravitational Potential Energy
Formula: PEG = mgh Height (in m) Mass (in kg) Acceleration due to gravity (9.8 m/s2)

9 Elastic Potential Energy
This potential energy is the energy stored in a spring. The amount of potential energy is related to how much it is stretched More stretch means more energy!

10 Elastic Potential Energy
Formula: PES = ½ kx2 Amount spring is stretched or compressed (in m) Spring constant

11 Kinetic energy Kinetic Energy: energy of motion
Depends on: mass, velocity

12 Kinetic Energy Formula KE = ½mv2 Velocity (in m/s) Mass (in kg)

13 Kinetic Energy Inquiry
What type of situation would create the possibility for negative kinetic energy? What would have to happen?

14 Today’s Agenda Do Now Important Dates Energy Review Energy Practice
5 min Do Now Important Dates 10 min Energy Review 35 min Energy Practice Exit Ticket

15 Potential Energy To practice with the different types of potential energy, we are going to use the Multiple Choice Cards

16 Gravitational Potential Energy
What is the potential energy of this 95 kg rock that is elevated 100 m above the ground? How do we know it has gravitational potential energy? 4750 J 9500 J 46550 J 93100 J

17 Gravitational Potential Energy
What is the potential energy of this 95 kg rock that is elevated 100 m above the ground? How do we know it has gravitational potential energy? 4750 J 9500 J 46550 J 93100 J

18 Gravitational Potential Energy
Knowing that the potential energy at the top of the tall platform is 50 J, what is the potential energy at the other positions shown on the stair steps and the incline?

19 Gravitational Potential Energy
Which graph best represents the relationship between the gravitational potential energy of an object and its height above Earth’s surface?

20 Gravitational Potential Energy
A 3 kg textbook sits on a 1.5 m high table. What is the potential energy of the book relative to the tabletop? What is the potential energy of the book relative to the ground? Hint: What’s the difference between these two situations?

21 Elastic Potential Energy
As a rubber band is stretched more and more, its potential energy: Increases Decreases Stays the same

22 Elastic Potential Energy
If the spring constant of a spring were to double, and the spring were compressed by the same amount, by what factor would the energy in the spring change? 2 4 Remain the same

23 Elastic Potential Energy
If the spring constant of a spring were to double, and the spring were compressed by the same amount, by what factor would the energy in the spring change? 2 4 Remain the same

24 Elastic Potential Energy
If the amount a spring was compressed were to double, and the spring constant were to remain the same, by what factor would the energy in the spring change? 2 4 Remain the same

25 Elastic Potential Energy
If the amount a spring was compressed were to double, and the spring constant were to remain the same, by what factor would the energy in the spring change? 2 4 Remain the same

26 Elastic Potential Energy
A student compresses the spring in a pop-up toy m. If the spring has a spring constant of 450 N/m, how much energy is being stored in the spring? 0.09 J 0.18 J 4.5 J 9 J

27 Elastic Potential Energy
A student compresses the spring in a pop-up toy m. If the spring has a spring constant of 450 N/m, how much energy is being stored in the spring? 0.09 J 0.18 J 4.5 J 9 J

28 Kinetic Energy To practice with kinetic energy, we are going to do Think- Pair-Share for every problem. You will first have time to complete the problem on your own. Then, you will pair with your table partner to come up with a final answer.

29 Kinetic Energy Determine the kinetic energy of a 800-kg roller coaster car that is moving with a speed of m/s.

30 Kinetic Energy Determine the kinetic energy of a 800-kg roller coaster car that is moving with a speed of m/s. 250,000 J If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic energy?

31 Kinetic Energy Determine the kinetic energy of a 800-kg roller coaster car that is moving with a speed of m/s. 250,000 J If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic energy? 1,000,000 J

32 Kinetic Energy A bicycle has a kinetic energy of 124 J. What kinetic energy would the bicycle have if it had… Twice the mass moving at the same speed? The same mass moving at twice the speed? One-half the mass and moving at twice the speed? The same mass and was moving with one-half speed? Three times the mass and moving with one-half speed?

33 Kinetic Energy Which graph best represents the relationship between the kinetic energy of a moving object and its velocity?

34 Mixed Review & Challenge
To do the mixed review & challenge problems, we are going to use the whiteboards.

35 Energy ID Identify the type of energy shown in the following diagrams
B C

36 Energy ID We are going to identify the type of energy at different points in a video of a crazy stunt.

37 Step Further A 45-kg boy is riding a 15-kg bicycle with a speed of 8 m/s. What is the combined kinetic energy of the boy and the bicycle?

38 Double Trouble A ski jumper, has a mass of 59.6 kg. He is moving with a speed of 23.4 m/s at a height of meters above the ground. What types of energy does he have? Calculate the values for both types of energy.

39 Double Trouble A 80-kg skydiver has a speed of 65 m/s when he is 940 m above the ground. What types of energy does he have? Calculate the values for both types of energy.

40 Challenge Problem A diver has a kinetic energy of 12,000 J right before hitting the water’s surface. If the diver’s mass is 40 kg, what is her speed at this point? What are you looking for? What type of energy is this? What equation should we use? Plug in known values Solve 

41 Challenge Problem If we wanted a spring to store 0.8 J of potential energy and it had a spring constant of 450 N/m, how much would we need to stretch the spring spring? What are you looking for? What type of energy is this? What equation should we use? Plug in known values Solve 

42 Final Inquiry Question
In your own words, define energy.

43 Independent Practice Take the next few minutes to complete the four independent practice problems on your Daily Organizer. If you finish early, you can work on homework for tomorrow.

44 Today’s Agenda Do Now Important Dates Energy Review Energy Practice
5 min Do Now Important Dates 10 min Energy Review 35 min Energy Practice Exit Ticket

45 Exit Ticket Exit tickets are my daily way of seeing whether or not you have understood the objectives we have gone over during class each day. They are NOT be graded for accuracy but WILL be graded for completion so make sure you always try each and every question. These exit tickets must be done silently and independently. If you violate this, you will lose your participation points for the day.

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