# Deck 1 = Physics start of year- 10/10/13 Flashcards

## revision for half term tast

What is energy measured in?

-Joules.

Name types of energy?

-Chemical potential, kinetic, gravitational potential, potential, elastic potential, nuclear potential, thermal energy, electrical, radiation.

What is energy measured in?

-Joules.

Law of energy conservation?

-Energy can not be destroyed, During each transformation, the total amount of energy stays the same.

What happens to GPE as you climb?

-It increase.

Gravitational field strength on earth?

-10 newton per kilogram.

What is the efficiency equation?

-Efficiency = useful power output (w) over power input (w).

Work done =

-Energy transformed measured in J.

Unit for energy efficiency?

-No unit, or percentage.

What is kinetic energy measured in?

-J

What is thermal energy measured in?

-J

What is chemical potential measured in?

-J

What is power measured in?

-W

Define work?

-Work is done whenever a force make something move. The greater the force and the greater the distance moved, the more work is done.

One joule=

-One newton meter.

If an engine does 2000J of useful work in 2 seconds, what is its power output?

-1000J

Engine does 25J of useful work for every 100J of energy supplied, what is its efficiency?

-0.25 or 25%

Rearrange GPE=mgh to find H?

-GPE over mg = H