# Physics second progress test revision flash cards

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Give the definition of heat capacity.
The amount of heat needed to raise the temperature of 1kg of a substance by 1 degree celcius.
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What is the word formula for specific heat capacity?
Energy=Mass*specific heat capacity*theta
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What is the symbol formula and it's units?
E(Joules, J)=m(kg)*c(J/kg)*circle with a slanted line through it.(Theta-change/difference in temperature degrees celcius)
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As you have to rearrange the formula what is the equation to use for specific heat capacity is?
C=E/(m*theta)
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What does the amount of energy stored in an object depend on?
The mass of the object, its temperature and the material it's made from.
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For a particular object the greater its mass and the higher its temperature... complete the sentence.
The more energy is stored.
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Name the 8 types of energy.
Electrical, chemical, kinetic, gravitational potential, elastic potential, thermal, sound and light.
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What is the law of conservation of energy?
Energy is never made or destroyed, it is just transferred from one form to another.
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Give the energy transfer of an hoover and state whether the energy is useful or wasteful.
Electrical (arrow) Kinetic (u) (2 arrows) Sound(w) Heat(w)
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What is efficiency?
Efficiency is the fraction of energy that is usefully transferred.
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Some specialised machines are 100% efficient, true or false?
FALSE
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What is the formula for efficiency?
efficiency=useful energy out/ total energy in (*100%)
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An 11W energy efficient lightbulb has 100J of energy transferred to it. It transfers 65J of energy to light energy. How efficient is this lightbulb?
65/100 (*100%)= 65% efficient
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If there was a sankey diagram with a 200J input and a 50J useful output how much energy is wasted?
150J
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Out of the following appliances which 2 have the most percentage use?-Entertainment, Cooking, Fridges/freezers, Lighting, Dishwahers/washing machines or Other.
Entertainment (20%) and Lighting (20%).
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Why do people choose to buy appliances that are not really necessary?
We have thee ability to, we enjoy comforts/ luxuries, a way to show off, it's a priviledge of our modern day society and we have the financial stability.
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In what form is the useful energy output in a nuclear power station?
Thermal energy
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The energy found in moving objects is kinetic ,true or false?
TRUE
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What is the stored energy in a catapult?
Elastic potential
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Gravitational potential is the energy stored in raised objects, true or false?
TRUE
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## Other cards in this set

### Card 2

#### Front

What is the word formula for specific heat capacity?

#### Back

Energy=Mass*specific heat capacity*theta

### Card 3

#### Front

What is the symbol formula and it's units?

### Card 4

#### Front

As you have to rearrange the formula what is the equation to use for specific heat capacity is?

### Card 5

#### Front

What does the amount of energy stored in an object depend on?