Set Heat Device Requirements - Middle School Physical Science
Card 1 of 25
Choose the best material for a criterion “maximize heat transfer to a pan”: wood, plastic, or aluminum.
Choose the best material for a criterion “maximize heat transfer to a pan”: wood, plastic, or aluminum.
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Aluminum. Metals have high thermal conductivity for efficient heat transfer.
Aluminum. Metals have high thermal conductivity for efficient heat transfer.
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What design feature most directly reduces convective heat transfer through an opening?
What design feature most directly reduces convective heat transfer through an opening?
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Seal gaps to prevent air movement (reduce fluid flow). Convection requires moving fluids; stopping flow stops heat transfer.
Seal gaps to prevent air movement (reduce fluid flow). Convection requires moving fluids; stopping flow stops heat transfer.
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What surface property should be specified to reduce heat transfer by radiation?
What surface property should be specified to reduce heat transfer by radiation?
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Low emissivity (shiny, reflective surface). Reflective surfaces emit less thermal radiation than dark ones.
Low emissivity (shiny, reflective surface). Reflective surfaces emit less thermal radiation than dark ones.
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What surface property should be specified to increase heat transfer by radiation?
What surface property should be specified to increase heat transfer by radiation?
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High emissivity (dark, matte surface). Dark surfaces absorb and emit radiation more efficiently.
High emissivity (dark, matte surface). Dark surfaces absorb and emit radiation more efficiently.
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What is the most appropriate criterion statement format for thermal control performance?
What is the most appropriate criterion statement format for thermal control performance?
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A measurable goal with a quantity, unit, and test condition. Effective criteria must be specific and testable.
A measurable goal with a quantity, unit, and test condition. Effective criteria must be specific and testable.
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What is one valid criterion for a container designed to keep a drink cold for 2 hours?
What is one valid criterion for a container designed to keep a drink cold for 2 hours?
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Keep liquid temperature above $0,^{\circ}\text{C}$ and below $10,^{\circ}\text{C}$ for 2 h. Specifies measurable temperature range and time duration.
Keep liquid temperature above $0,^{\circ}\text{C}$ and below $10,^{\circ}\text{C}$ for 2 h. Specifies measurable temperature range and time duration.
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What is one valid constraint related to materials for a thermal-control device used by students?
What is one valid constraint related to materials for a thermal-control device used by students?
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Must use non-toxic, non-flammable materials. Safety constraints protect users from harmful substances.
Must use non-toxic, non-flammable materials. Safety constraints protect users from harmful substances.
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What is one valid constraint related to size for a handheld thermal-control device?
What is one valid constraint related to size for a handheld thermal-control device?
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Must fit within specified dimensions (maximum length, width, and height). Size constraints ensure the device meets practical use requirements.
Must fit within specified dimensions (maximum length, width, and height). Size constraints ensure the device meets practical use requirements.
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What is one valid constraint related to cost when designing a thermal-control device?
What is one valid constraint related to cost when designing a thermal-control device?
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Total material cost must be below a stated budget limit. Budget constraints limit material selection and design complexity.
Total material cost must be below a stated budget limit. Budget constraints limit material selection and design complexity.
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Identify the independent variable when testing insulation thickness on heat loss.
Identify the independent variable when testing insulation thickness on heat loss.
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Insulation thickness. The variable you change to test its effect on heat loss.
Insulation thickness. The variable you change to test its effect on heat loss.
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Identify the dependent variable when testing insulation thickness on heat loss.
Identify the dependent variable when testing insulation thickness on heat loss.
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Temperature change or rate of heat loss. The measured outcome that changes based on insulation thickness.
Temperature change or rate of heat loss. The measured outcome that changes based on insulation thickness.
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Which option is a constraint: “mass must be less than $0.50,\text{kg}$” or “minimize heat loss”?
Which option is a constraint: “mass must be less than $0.50,\text{kg}$” or “minimize heat loss”?
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“Mass must be less than $0.50,\text{kg}$”. Mass limit is a restriction, not a performance goal.
“Mass must be less than $0.50,\text{kg}$”. Mass limit is a restriction, not a performance goal.
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What is the meaning of a design criterion for a device that controls thermal energy transfer?
What is the meaning of a design criterion for a device that controls thermal energy transfer?
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A required feature or performance goal the device must achieve. Criteria define what the device should accomplish, not how.
A required feature or performance goal the device must achieve. Criteria define what the device should accomplish, not how.
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What is the meaning of a design constraint for a device that controls thermal energy transfer?
What is the meaning of a design constraint for a device that controls thermal energy transfer?
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A limit on the design, such as cost, size, materials, or safety rules. Constraints restrict design choices and set boundaries.
A limit on the design, such as cost, size, materials, or safety rules. Constraints restrict design choices and set boundaries.
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Which term names a measurable target like “reduce heat loss by 50%”: criterion or constraint?
Which term names a measurable target like “reduce heat loss by 50%”: criterion or constraint?
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Criterion. Criteria are goals to meet; constraints are limits to work within.
Criterion. Criteria are goals to meet; constraints are limits to work within.
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Which term names a limit like “must cost under $10”: criterion or constraint?
Which term names a limit like “must cost under $10”: criterion or constraint?
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Constraint. Constraints impose restrictions on the design process.
Constraint. Constraints impose restrictions on the design process.
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What are the three main mechanisms of thermal energy transfer a device may control?
What are the three main mechanisms of thermal energy transfer a device may control?
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Conduction, convection, and radiation. Heat moves through direct contact, fluid motion, and electromagnetic waves.
Conduction, convection, and radiation. Heat moves through direct contact, fluid motion, and electromagnetic waves.
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What property of a material should be specified to control conduction through a device?
What property of a material should be specified to control conduction through a device?
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Thermal conductivity (high to transfer, low to insulate). Materials with low $k$ values resist heat flow; high $k$ values promote it.
Thermal conductivity (high to transfer, low to insulate). Materials with low $k$ values resist heat flow; high $k$ values promote it.
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What design choice most directly reduces conductive heat transfer through a wall?
What design choice most directly reduces conductive heat transfer through a wall?
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Use a low-conductivity material and increase thickness. Poor conductors and thicker barriers resist heat flow better.
Use a low-conductivity material and increase thickness. Poor conductors and thicker barriers resist heat flow better.
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Which option is a criterion: “must use only recycled materials” or “reduce heat transfer rate”?
Which option is a criterion: “must use only recycled materials” or “reduce heat transfer rate”?
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“Reduce heat transfer rate”. Heat transfer reduction is a performance goal, not a limitation.
“Reduce heat transfer rate”. Heat transfer reduction is a performance goal, not a limitation.
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Which material property should be low to reduce conduction through a device: thermal conductivity $k$ or density $\rho$?
Which material property should be low to reduce conduction through a device: thermal conductivity $k$ or density $\rho$?
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Thermal conductivity $k$. Lower $k$ means less heat flows through the material.
Thermal conductivity $k$. Lower $k$ means less heat flows through the material.
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What is radiation in the context of thermal energy transfer to or from a device?
What is radiation in the context of thermal energy transfer to or from a device?
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Heat transfer by electromagnetic waves (infrared). All objects emit infrared radiation based on temperature.
Heat transfer by electromagnetic waves (infrared). All objects emit infrared radiation based on temperature.
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What is convection in the context of thermal energy transfer around a device?
What is convection in the context of thermal energy transfer around a device?
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Heat transfer by moving fluids (liquids or gases). Moving fluids carry thermal energy with them.
Heat transfer by moving fluids (liquids or gases). Moving fluids carry thermal energy with them.
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What is a clear, measurable criterion for an insulating container intended to slow cooling?
What is a clear, measurable criterion for an insulating container intended to slow cooling?
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Maintain target temperature for a specified time interval. Provides measurable success metric for insulation performance.
Maintain target temperature for a specified time interval. Provides measurable success metric for insulation performance.
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Which design change most directly reduces conduction: thicker insulation or adding ventilation holes?
Which design change most directly reduces conduction: thicker insulation or adding ventilation holes?
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Thicker insulation. More material creates greater resistance to heat flow.
Thicker insulation. More material creates greater resistance to heat flow.
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