We have discussed the following during the lessons today.
What should we be looking out for?
1) Identify the highest point and relate it to the amount of gravitational potential energy
2) State the relationship between the height of the skater and the change in gravitational potential energy
3) Identify the point at which kinetic energy is zero and observe the change in kinetic energy at various points given
Do note that the discussions were based on the exclusion of friction and heat energy.
Please try to include friction in the track and observe the difference.
We will continue our discussions next week.
What can you do next?
Try changing the skater or adjust the mass of the selected skater and observe if there is any change in the amount of gravitational potential energy and kinetic energy.
If your skater is being thrown off the track at certain point, please adjust the track accordingly.
At the end of the activities, you should be able to conclude the factors affecting gravitational potential energy and describe the conversion in energy based on the diagram given.
Have fun!
Reminders
- Total Defence Day on Monday 15 Feb, 2016 (Please come in appropriate home-attire)
- Learning Journey to Gardens by the bay (In home-attire, small bag to contain your writing materials such as pen or pencils, water bottle)
- Math Test on Fraction on 18 Feb
Plz do a subject heading...it almost crashed my pc
ReplyDeleteDear ZOT Gaming
ReplyDeleteThanks for pointing that out. I did not know that a missing subject heading can crash a computer in the first place.
Also, please identify yourself.
Mr Jonathan, this person invaded our class blog last year too.
DeleteWhat you have to know to answer those questions completely:
ReplyDeleteGravitational Potential Energy = Mass x Gravitational Field Strength x Height.
1) If mass and gravitational field strength remains constant (does not change), when its height is at maximum, gravitational potential energy is at its maximum too. (Identify the point where gravitational potential energy is at its greatest = answer)
2) The height of the skater is directly proportional to gravitational potential energy (as the height of the skater increases, gravitational potential energy increases as well). Only if mass and gravitational field strength is constant.
3) Kinetic energy is inversely proportional to gravitational potential energy (As kinetic energy decreases, gravitational potential energy increases), when kinetic energy is zero, gravitational potential energy is at its maximum. Hence, when kinetic energy is zero, the skater is at his highest point.
When gravitational potential energy converts to kinetic energy, some of its energy is lost as heat energy through friction between the wheels of the skates and the tracks. (Realistically, if this is false, the skater be in perpetual motion, which does not exist as there will always be energy losses)
Answer by Anonymous
I am from EDP, graduated in '12 :)
Just visiting you guys. Enjoy!
Thks.
Delete