p1. energy Flashcards
what is a system
an object or a group of objects
energy store and transfer of an object being projected upwards
stored as kinetic energy
slowly transferred from kinetic to gravitational potential store
as it slows down and climbs higher
energy store and transfer of a moving object hitting an obstacle
stored as kinetic energy
once hitting an obstacle,energy can be transferred into many different types of energy
eg. surroundings - thermal energy and sound waves
energy transfer of an object accelerated by a constant force
chemical,thermal or electrical energy to start acceleration
converted into kinetic energy
energy store and transfer of a vehicle slowing down
stored as kinetic energy from car
transferred to thermal energy of the brakes
energy transfer of bringing water to a boil in an electric kettle
electrical energy to thermal energy
4 types of energy transfers
mechanical working – force applied to move an object through a distance.
electrical working – charge flows (electricity)
heating – energy transferred between hotter and colder regions.
radiation – energy transferred as a wave, for example as light or sound.
what is specific heat capacity of a substance
amount of energy required to raise temperature of one kilogram of the substance,by
one degree celsius
RP : determine specific heat capacity of one or more materials
- block of solid material with two holes at the top - heater and thermometer
- wrap insulating layer to reduce energy transfer
from block into surroundings and insert thermometer and heater - measure initial temperature of block and set potential difference of power supply to 10V.
- turn on power supply and start stopwatch - as block heats up,take readings of temperature and current every minute for 10 minutes - current does not change
- calculate power of heater and how much energy transferred to heater
6.repeat with different materials and compare
