Energy resources and Energy transfers

Worked examples (9)

• 1Name the stores and pathways (Getting started)
• 2Identify the store from a clue (Getting started)
• 3Describe a simple transfer (Getting started)
• 4An electric kettle (Building confidence)
• 5Elastic to kinetic (Building confidence)
• 6Correct the wrong terms (Building confidence)
• 7A bouncing ball (Stretch)
• 8A child on a swing (Stretch)
• 9Energy from the Sun (Stretch)

Model answers (9)

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Worked examples (9)

• 1Match quantities to units (Getting started)
• 2Define the joule (Getting started)
• 3Watt or joule? (Getting started)
• 4Convert before substituting (Building confidence)
• 5Why GPE comes out in joules (Building confidence)
• 6Why KE comes out in joules (Building confidence)
• 7A multi-conversion calculation (Stretch)
• 8The grams trap (Stretch)
• 9Energy or power? (Stretch)

Model answers (9)

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Worked examples (9)

• 1State the principle (Getting started)
• 2Find the wasted energy (Getting started)
• 3Why energy is not lost (Getting started)
• 4Gravitational to kinetic (Building confidence)
• 5When air resistance acts (Building confidence)
• 6A rollercoaster energy audit (Building confidence)
• 7Why no machine is 100% efficient (Stretch)
• 8A closed system (Stretch)
• 9Spotting an impossible claim (Stretch)

Model answers (9)

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Worked examples (9)

• 1Calculate an efficiency (Getting started)
• 2Find the useful output first (Getting started)
• 3Find the useful output from an efficiency (Getting started)
• 4Read a Sankey diagram (Building confidence)
• 5Draw a Sankey diagram (Building confidence)
• 6Compare two lamps (Building confidence)
• 7Efficiency from power (Stretch)
• 8Improving efficiency (Stretch)
• 9Why a heater is nearly 100% efficient (Stretch)

Model answers (9)

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Worked examples (9)

• 1Why trapped air insulates (Getting started)
• 2Cavity wall insulation (Getting started)
• 3Which transfer does each block? (Getting started)
• 4Double glazing (Building confidence)
• 5Insulating a whole house (Building confidence)
• 6Reducing mechanical waste (Building confidence)
• 7Linking insulation to efficiency (Stretch)
• 8Thickness and conductivity (Stretch)
• 9Blocking all three transfers (Stretch)

Model answers (9)

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Worked examples (9)

• 1Explain conduction (Getting started)
• 2Why metal feels colder than wood (Getting started)
• 3A convection current in water (Getting started)
• 4Why convection cannot occur in solids (Building confidence)
• 5Radiation and the vacuum (Building confidence)
• 6Sea breezes (Building confidence)
• 7Hot-air balloons (Stretch)
• 8Heating a room (Stretch)
• 9All three at once (Stretch)

Model answers (9)

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Worked examples (9)

• 1Best and worst surfaces (Getting started)
• 2Why one surface does both (Getting started)
• 3The effect of temperature (Getting started)
• 4Leslie's cube (Building confidence)
• 5Explain a design choice (Building confidence)
• 6Cooling fins (Building confidence)
• 7Foil survival blankets (Stretch)
• 8Why a drink cools more slowly (Stretch)
• 9White houses in hot countries (Stretch)

Model answers (9)

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Worked examples (9)

• 1Comparing conductors (Getting started)
• 2The control variables (Getting started)
• 3Tracing a convection current (Getting started)
• 4Convection in air (Building confidence)
• 5Leslie's cube (Building confidence)
• 6Comparing absorbers (Building confidence)
• 7Interpreting results (Stretch)
• 8Improving accuracy (Stretch)
• 9Safety across the practical (Stretch)

Model answers (9)

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Worked examples (9)

• 1Direct substitution (Getting started)
• 2Rearrange for the force (Getting started)
• 3Convert the distance first (Getting started)
• 4Lifting — find the weight first (Building confidence)
• 5When no work is done (Building confidence)
• 6Work against friction (Building confidence)
• 7Work becomes gravitational energy (Stretch)
• 8Comparing a ramp with a direct lift (Stretch)
• 9Which store does the work fill? (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Direct substitution (Getting started)
• 2Convert the mass first (Getting started)
• 3Rearrange for the height (Getting started)
• 4The ramp trap (Building confidence)
• 5Work done equals GPE gained (Building confidence)
• 6Proportionality (Building confidence)
• 7When work exceeds GPE gained (Stretch)
• 8GPE on the Moon (Stretch)
• 9Climbing stairs (Stretch)

Model answers (9)

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Worked examples (9)

• 1Direct substitution (Getting started)
• 2A car's kinetic energy (Getting started)
• 3Doubling the speed (Getting started)
• 4Rearrange for the speed (Building confidence)
• 5Rearrange for the mass (Building confidence)
• 6Convert km/h first (Building confidence)
• 7Change in kinetic energy (Stretch)
• 8Braking distance and v² (Stretch)
• 9Comparing two objects (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Direct substitution (Getting started)
• 2Convert the time first (Getting started)
• 3Rearrange for the energy (Getting started)
• 4Same work, different times (Building confidence)
• 5Power climbing stairs (Building confidence)
• 6Power while accelerating (Building confidence)
• 7Rearrange for the time (Stretch)
• 8Power with efficiency (Stretch)
• 9Driving force at constant speed (Stretch)

Model answers (9)

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Worked examples (9)

• 1Impact speed with no mass given (Getting started)
• 2Why mass makes no difference (Getting started)
• 3The long method with a mass (Getting started)
• 4Thrown upwards (Building confidence)
• 5A swinging pendulum (Building confidence)
• 6Falling with air resistance (Building confidence)
• 7Rollercoaster energy (Stretch)
• 8Braking to rest (Stretch)
• 9Thrown downwards (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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