Work and Energy
The unit of work and energy.
What is the 'joule'?
The energy of a skier about to make a jump off a cliff.
What is an example of "gravitational potential energy"?
The unit of power.
What is the "watt"?
The SI unit of pressure.
What is the 'pascal'?
The pressure caused by the air all around us.
What is atmospheric pressure?
The energy of a toy car rolling across the floor.
What is an example of "kinetic energy"?
The formula for gravitational potential energy.
What is " mass x gravitational constant x height"?
The formula for power.
What is "work done (or energy converted) / time"?
The formula for pressure exerted by a solid.
What is " Force / Area"?
This happens to a gas' pressure when it is heated.
What is "the gas pressure increases"?
The energy of a stretched bow.
What is an example of " elastic potential energy"?
The formula for kinetic energy.
What is "1/2 x mass x velocity2"?
The formula for efficiency.
What is "useful energy output / energy input"?
The formula for the pressure of a liquid.
What is "density x gravitational constant x height"?
An instrument that uses a known liquid in a tube to measure gas pressure.
What is a u-tube manometer?
The formula for work done.
What is "force multiplied by distance moved in the direction of the force"?
The term commonly used for the combination of an object's kinetic and potential energy.
What is "mechanical energy"?
Your response when asked for the unit of efficiency.
What is "efficiency is unitless"?
The pressure exerted on the ground by a 50N crate of surface area 1m2.
What is 50 Pa?
An instrument used to measure atmospheric pressure.
What is a mercury barometer?
This is the Principle of Conservation of Energy.
What is the statement "Energy cannot be created or destroyed, but can be converted from one form to another"?
A falling object's kinetic energy if it's mechanical energy is 50 J and it's potential energy is 20 J.
What is 30 J?
A major source of inefficiency in a pulley.
What is "friction"?
The water pressure at the bottom of a tank of height 2 metres. (density of water = 1000 kg.m-3)
What is 20,000 Pa?
The three factors that affect gas pressure.
What are "volume", "temperature" and "number of gas molecules"?