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Objective: To identify whether positive, negative, or zero work is being done, to identify the force that is doing the work, and to describe the energy transformation associated with such work.
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Modeling Roller Coasters
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Given eight energy terms, make matching pairs based on their shared meaning.
Student Name:
Redo
Complete three paragraphs by selecting appropriate words and phrases from a bank of options.
Complete a 4-row table of KE, PE, and TME values for a roller coaster car at four positions.
Looking a Bit Closer
Rank the KE, PE, TME, and speed of two objects of varying mass and position within the system.
Predicting Values
Given a coaster layout and the correct energy chart for one location, identify the one incorrect chart for three other locations.
Matching Energy
Ranking Tasks
Energy Charts
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Stopping Distance
One aspect of safe driving involves the ability to stop a car readily. This ability depends upon the driver's alertness and readiness to stop, the conditions of the road, the speed of the car, and the braking characteristics of the car. The actual distance it takes to stop a car consists of two parts - the reaction distance and braking distance.
When a driver sees an event in his/her field of view that might warrant braking (for example, a dog running into the street), a collection of actions must be taken before the braking actually begins. First the driver must identify the event and decide if braking is necessary. Then the driver must lift his/her foot off the gas pedal and move it to the brake pedal. And finally, the driver must press the brake down its full distance in order to obtain maximum braking acceleration. The time to do all this is known as the reaction time. The distance traveled during this time is known as the reaction distance. Once the brakes are applied, the car begins to slow to a stop. The distance traveled by the car during this time is known as the braking distance. The braking distance is dependent upon the original speed of the car, the road conditions, and characteristics of the car such as its profile area, mass and tire conditions. Figure 1 shows the stopping distance for a Toyota Prius on dry pavement resulting from a 0.75-second reaction time.
The reaction time of the driver is highly dependent upon the alertness of the driver. Small changes in reaction time can have a large effect upon the total stopping distance. Table 1 shows the reaction distance, braking distance, and total stopping distance for a Toyota Prius with an original speed of 50.0 mi/hr and varying reaction times.
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Activity:
Each Science Reasoning task is based on a passage or story that presents data and information or describes an experiment or phenomenon. Students must combine an understanding of science content and science reasoning skills (science practices) to answer questions about the passage or story.
Tap anywhere to view the passage.
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https://www.physicsclassroom.com/
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Physics-Interactives/Static-Electricity/
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1,1,1,7,7,7,7,4,2,2,2,2,6,6,6
Name-That-Charge/
Template Version 1.2 Added Question Scene 4 for Table Completion
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Management
Matching Energy,Energy Charts,Predicting Values,Ranking Tasks,Looking a Bit Closer
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Tap the fields to rank the four locations according to their TME.
Tap the signs to toggle between greater than and equal to.
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greatest
Activity 4: Ranking Values
This activity involves making energy rankings for various quantities related to energy in a rollercoaster system. We will use the following symbols for the quantities you must rank – KE for kinetic energy, PE for potential energy, TME for total mechanical energy, and v for speed.
You can make the following assumptions:
Friction is negligibleSystem = car and rider + EarthCarts starts from rest at top of hillTotal mechanical energy is conserved
least
Rank the total mechanical energy of the car/rider at each location relative to the Earth from greatest to least. If two locations are equal, then tap the sign to toggle between greater and equal to.
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Activity 3: Predicting Values
In this activity, you will make energy predictions for a rollercoaster car at four positions along the track. You will calculate the kinetic energy (KE), potential energy (PE), and total mechanical energy (TME) values at these four positions.
You can make the following approximations and assumptions:
g = 10 N/kgFriction is negligibleSystem = car and rider + EarthTotal mechanical energy is conservedThe loop is a perfect circle
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Color-Coding Key:
Complete the table. The loop is a perfect circle.
m = 200 kg
hA = 15.0 m
vB = 20.0 m/s
hD = 2.0 m
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The energy pie chart at location B is correct. Which one of the energy pie charts for the other three locations is incorrect?
Activity 2: Energy Charts
This activity involves analyzing models that communicate energy transfer in a rollercoaster. You will be presented with an accurate energy pie chart or energy bar chart for one of the locations along the track. And you will be given pie charts or bar charts for three other locations. One of the charts is incorrect. You will have to identify which one it is.
You can make the following assumptions:
Friction is negligibleSystem = cart and rider + EarthTotal mechanical energy is conserved