# Shared Flashcard Set

## Details

Energy equations iGCSE
Give the equation required to solve the problem
22
Physics
04/03/2017

Term
 Give equation for Kinetic Energy in terms of mass and velocity.
Definition
 Kinetic Energy = (1/2) x mass x velocity2
Term
 Give the equation for Gravitational Potential Energy of an object in terms of the object's mass, the planet's gravitational field strength (g) and height of the object above the ground.
Definition
 Gravitational Potential Energy = mass x g x height
Term
 In the equation:   Gravitational Potential Energy = mass x g x height   Does 'mass' refer to the mass of the lifted object or the mass of the planet that is pulling down on the mass of the lifted object?
Definition
 'mass' refers to the mass of the lifted object.
Term
 In the equation:   Gravitational Potential Energy = mass x g x height   Does 'height' refer to how tall the massive object is or to how far off the ground the massive object is?
Definition
 'height' refers to how far off the ground the massive object is.   Stricky speaking 'height' here refers to how far off the ground the centre of mass of the object is.
Term
 In the equation:   Gravitational Potential Energy = mass x g x height   What value do we normally take 'g' to be on Earth?
Definition
 10 (N/kg)
Term
 In the equation:   Gravitational Potential Energy = mass x g x height   What are the units of 'g'?
Definition
 Newtons per kilogram (N/kg)   Notice that this has the units of Force (N) per mass (kg)
Term
 In the equation:   Gravitational Potential Energy = mass x g x height   What physical quantity does 'g' represent? (we are not looking for a number here)
Definition
 'g' represents the gravitational field strength of the planet or moon that the massive object is on.
Term
 When using the equation:   Gravitational Potential Energy = mass x g x height   What units should the mass be in?
Definition
 kilograms (kg)   Remember: 1kg = 1000g
Term
 When using the equation:   Gravitational Potential Energy = mass x g x height   What units should the height be in?
Definition
 metres (m)   Remember:   1m = 100cm   1m = 1000mm   1m = (1/1000)km
Term
 Give the units for:   Gravitational Potential Energy
Definition
 Joules (J)
Term
 Give the units for:   Kinetic Energy
Definition
 Joules (J)
Term
 Give the units for:   Work done (W.d.)
Definition
 Joules (J)
Term
 Give the units for:   Amount of energy stored (any type of energy store).
Definition
 Joules (J)
Term
 Give the units for:   Amount of energy transfered (any type of transfer)
Definition
 Joules (J)
Term
 Name the 8 forms of energy store.
Definition
 Kinetic Energy (of moving, massive objects) Gravitational PE (of lifted, massive objects) Thermal Energy (of hot, massive objects) Elastic PE (of stretched/squashed, springy objects) Chemical (of food, muscles, plants, fossil fuels and batteries) Nuclear (of uranium 235 fuel rods) Electrostatic (of electrically charged objects) Magnetic (of magnets)
Term
 Name the 4 main energy transfers.
Definition
Term
 When using the equation:   Kinetic Energy = (1/2) x mass x velocity2   What units should be used for velocity?
Definition
 meters/second (m/s)
Term
 How many meters per second (m/s) is 1 kilometer per hour (1km/hr)?
Definition
 We know: 1000m = km 3600s = hr    (because there are 60x60s in 1 hr) Use these as follows: 1km/hr = 1(1000m/3600s)   Now calculate: 1km/hr = 0.278m/s
Term
 What kind of energy store increases as a massive object gain as it is lifted?
Definition
 The Gravitational Potential Energy of the object being lifted.   We have to say the form (GPE) and of what (the lifted object)
Term
 What is the principle of conservation of energy?
Definition
 Energy cannot be created or destroyed only transfered from one store to another store.
Term
 What is the definition of temperature?
Definition
 The average kinetic energy of particles.
Term
 What is the difference between thermal energy and temperature?
Definition
 Thermal energy the sum total of the kinetic energy of the particles whereas the temperature is the average kinetic energy of the particles.
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