Physical Science Thursday-Friday 11-8 Old Work New work.

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Presentation transcript:

Physical Science Thursday-Friday 11-8 Old Work New work

Hand in homework Pencil Sharpener Rube Analysis Handout on Equations and energy review

New Homework P407 problems 1-3 on efficiency Eff = W o WiWi x 100 Remember, W = F x d

Also for homework P

Conservation of energy Open or closed system What does it mean

Conservation of energy Closed system – energy remains constant in system over time Open system – energy flows in/out of the system Law– in a closed system, energy can not be created or destroyed, only transferred/transformed.

Roller Coaster

Roller Coaster Building Workbook Answer questions on page 10 Potential energy = GPE Read Pages 11,12 on energy and roller coasters

Question? Some company on the scale of Disney or Universal studios is planning to open a top rank amusement park in Delaware. They are asking for design proposals for the wildest, coolest ride ever created. That is where you come in to the picture

Roller Coaster Design Maximum length of prepared track is 24 ft The ball must end exactly 35cm off the ground Track must have at least 2 hills (at least 55 cm of relief) in the run Track must touch the floor at least once Track must have at least one unusual feature (Curve, loop, jump…) One hill must be high enough for the marble to just barely pass over the top. The marble must come to a rest in 30 cm because of increased friction

The sections of the project Performance stage Design and Analysis stage

Materials Track is to be made out of pipe insulation The ball will be steel, glass or wood The track will be primarily connected to the wall by duct tape (though other supports can be added The track will have to be put up and taken down every class period (special sections can be built and stored in the back of my room)

Performance Can you keep a marble along the track from start to finish while accomplishing its goals? Can you do the task twice with the same set-up?

Design and Analysis Can you record the height of your roller coaster at each place where it changes direction, and including start and end points? Can you record the distance between each vertical measurement Can you sketch a scale model of your roller coaster?

Analysis Can you calculate the GPE at any point along the roller coaster? Can you use the concept of energy conservation to determine KE and TE at different points along the course Can you relate the laws of motion what will be experienced by the riders of your roller coaster? Can you determine the amount of work and the power output done to lift the car to the top of the roller coaster?

Honors Determine the scale of the real roller coaster you would create. Estimate the mass of the car and passengers Determine KE, GPE and TE at important sections of the track Create a free body diagram and determine the force at important sections of the track

Pick Groups Pick your groups for the project 2-4 members Everybody in class must be included

In class Assignment Investigate Speed, Height and Energy Work through pages Before you answer the questions on pg 25, read the article on page 26