Questions Collection | Complete Revision Guide
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• What is a closed system? -✓✓Systems were neither matter nor
energy can enter or leave. The net change in the total energy of a
closed system is always zero.
• What does 'doing work' result in? -✓✓A transfer of energy
• What is the unit of energy? -✓✓Joule
• List the four ways energy can be transferred between stores? -✓✓By
mechanical work, by electrical work, by heating, by radiation
• What is the conservation of energy principle? -✓✓Energy can be
transferred usefully, stored or dissipated, but can never be created or
destroyed
• What is energy dissipation? -✓✓When energy is not transferred
usefully but is wasted (often as thermal energy)
• What is the equation linking kinetic energy, mass and velocity -
✓✓0.5 x mass x (velocity squared)
,• What are the units for velocity? -✓✓Meters per second (m/s)
• What are the units for mass? -✓✓Kilograms (kg)
• What is the equation linking elastic potential energy, the spring
constant and extension? -✓✓0.5 x spring constant x (extension
squared)
• What are the units for the spring constant? -✓✓Newtons per metre
(N/m)
• What are the units for extension? -✓✓Metres (m)
• What is the equation linking gravitational potential energy, mass,
gravity and height? -✓✓Mass x gravitational field strength x height
[Ep=mgh]
• What are the units for gravitational field strength? -✓✓Newtons per
kg (N/kg)
• What are the units for height? -✓✓Meters (m)
, • What is conduction? -✓✓The process by which vibrating particles
transfer energy to neighbouring particles
• What is thermal conductivity? -✓✓Are measure of how quickly
energy is transferred through a material by conduction
• What is convection? -✓✓Were energetic particles move away from a
hotter to cooler regions
• What does the symbol ∆ mean? -✓✓Change
• What is specific heat capacity of a substance? -✓✓The amount of
energy required to raise the temperature of 1 kg of the substance by 1°
Celsius
• What are the units for specific heat capacity? -✓✓Joules per kilogram
per ° C (Jk/kg/°C)
• What is power? -✓✓The rate at which energy is transferred or the
rate at which work is done if
• What is the unit of power? -✓✓Watts (W)