Monday 11-26 PS
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Transcript of Monday 11-26 PS
![Page 1: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/1.jpg)
Monday 11-26 PS
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Conversions
• Divide your gram (g) mass value by 1000 to determine the kilogram (kg) value
• Divide your speed in (km/hr) by 3.6 to get the speed in (m/s)
• (kJ) means kilojoules. Multiply the number of (kJ) by 1000 to get the value of energy in (j)
![Page 3: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/3.jpg)
Calculations for the roller coaster Project paper
This is due Wednesday (Tomorrow)
Neat, typed if possible
![Page 4: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/4.jpg)
![Page 5: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/5.jpg)
Equations
• GPE = m g h KE = ½mv2
• a = (Vf – Vi)/t p = m v
• MA = fo / fi W = f d
• P = W / t Fnet = m a
![Page 6: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/6.jpg)
Question #15
• Calculate the GPE at start
• What is the mass of your marble?small metal = 28.3 g clear glass = 8.5 gswirled glass = 6.0 g big metal = 67 gwood = 2.0 g
What is acceleration due to gravity on Earth?
What is the height?
![Page 7: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/7.jpg)
Question #16
• Calculate the GPE at the bottom of the first hill
![Page 8: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/8.jpg)
Question #17
• What is the difference in the amount of GPE in the problems 15 and 16?
![Page 9: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/9.jpg)
Question #18
• If the all of the ball’s energy lost from GPE was converted into KE at the bottom of the first hill, what is the velocity of the ball?
![Page 10: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/10.jpg)
Question #19
• What is the acceleration of the ball from the start to the bottom of the first hill, if it takes 5 seconds to travel between points
• Initial velocity ?
• Final velocity ?
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Question #20
• What is the momentum of the ball at the bottom of the first hill?
![Page 12: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/12.jpg)
Question #21
• What is the change in GPE of the ball from the start to finish of the roller coaster ride?
![Page 13: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/13.jpg)
Question #22
• How much energy of the ball was lost due to friction and sound by the end of the roller coaster?
• What else could take away some of the ball’s energy?
![Page 14: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/14.jpg)
The rest of this week we will concentrate on the equations
• Steps to solving a problem using an equation
1) Identify what is given
2) Identify what is wanted
3) Make sure all values are in correct units (kg, m, s , N, J, W)
4) Identify equation that relates the givens to what is wanted
5) Plug in givens
6) Solve for what you want
![Page 15: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/15.jpg)
Question
• A high jumper jumps 2.04 m. If the jumper has a mass of 67 kg, what is his gravitational potential energy at the highest point of the jump?
![Page 16: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/16.jpg)
Plug in and solve
• GPE = m g h
• GPE = (67) (10) (2.04)
• Around 1300 J
• The units are the units for energy, which can be used if all else is measured in m, kg, and s
![Page 17: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/17.jpg)
Question #2
• A rock is rolling down a hill with a velocity of 4.67 m/s. It has the kinetic energy of 18.9 kJ. What is the mass of the rock?
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Question
• A team of horses is hitched to a cart. The team pulls with a force of 471 N. The cart travels 2.3 km in 20 minutes. Calculate the work done on the cart and the power delivered by the horses.
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Horse problem
![Page 20: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/20.jpg)
Make up a problem
• Person
• On top of _______
• Person’s mass ______
• Amount of GPE person has ______
• Find height
![Page 21: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/21.jpg)
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Solution
![Page 23: Monday 11-26 PS](https://reader038.fdocuments.us/reader038/viewer/2022103006/568138ae550346895da06ce8/html5/thumbnails/23.jpg)
Scientific Notation
• A method used to write very large or very small numbers in a more manageable way.
• 15000 = 1.5 x 104
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Write in scientific notation
• The planet of Saturn has a mass of
568 500 000 000 000 000 000 000 000 kg
In 1997, 70 294 601 planes either took off or landed at Chicago’s O’Hare airport
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Complete the questions on the handout in class
• Identify
• Check units
• Find the right Equation
• Plug in and solve
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Homework
• Pg 858-859
• Problems 111-113, 116-125
• Due Wednesday in addition to the calculation page of the roller coaster project