BTEC Applied Science Unit 5 physics

BTEC Applied Science Unit 5 physics What are the standard units of mass, length and time? - Kilograms, metres and seconds What are the SI prefixes for 10^3, 10^6 and 10^9? - kilo, mega, giga What are the SI prefixes for 10^-3, 10^-6 and 10^-9? - milli, micro, nano What is work done? - The energy transferred in moving something What is power? - the rate at which work is done What happens to a gas when it is compressed? - Particles get closer together Gas pressure increases More collisions between particles and container Temperature of gas rises How do you calculate work done from a P-V graph? - The area under the graph What is efficiency? - the percentage of the work input that becomes useful work output What is thermal equilibrium? - when two objects have the same temperatures and net heat transfer is zero What is the first law of thermodynamics? - The change in a system's internal energy is equal to the difference between heat added to the system from its surroundings and work done by the system on its surroundings What are ideal gases? - All collisions are elastic