15701830
Description
| Question | Answer |
| name the energy stores - | thermal , kinetic , gravitational potential , elastic potential , magnetic , electrostatic , nuclear and chemical |
| describe how energy is transferred as a ball falls to the ground - | the energy stored in the ball's gravitational potential energy store is transferred as the ball falls to its kinetic energy store |
| what is the kinetic energy store equation ? - | kinetic energy (J)= 0.5 x mass(Kg) x speed(2)(m/s(2)) |
| what happens to the speed on an object if energy is transferred into into kinetic energy store ? - | it's speed will increase as it is being given more energy |
| what is the gravitational potential energy store equation ? - | g.p.e (J) = mass (Kg) x gravitational field strength (N/Kg) x height (m) |
| what kind of energy is transferred when you compress a spring ? - | elastic potential energy |
| what is the definition of the specific heat capacity of a material ? - | the specific heat capacity of a material is the amount of energy required to heat 1 kg of a material by 1 degree |
| what is the equation relating to energy transferred and specific heat capacity ? - | change in thermal energy (J) = mass (Kg) x specific heat capacity (J/Kg degree) x temperature change (degree) |
| describe an experiment to find the specific heat capacity of a material - | block of a sold material with two holes , one for the thermometer and the other for the heater , after measuring the mass of the block of material , wrap in insulation in order to reduce heat loss therefore increasing the overall accuracy , then insert the heater and the thermometer , measure the initial temperature of the block , set the potential difference (V) of the power supply to 10V , turn on the power supply and start the stopwatch |
| state the conservation of energy principle - | energy is always conserved , it can be transferred usefully , stored or dissipated , but can never be created or destroyed |
| define power and give two equations used to calculate power - | power = the rate of transferring energy / doing work power (W) = work done (J) x time (s) |
| what are the units of power | watts = W |
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