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level: Level 1 of Work, Energy and Power

Questions and Answers List

level questions: Level 1 of Work, Energy and Power

QuestionAnswer
What is meant by work doneWork done is a way of transferring energy from one object to another
Define energyThat which is transferred when a force moves through a distance
When pushing a car along a road what are the 2 factors involved in calculating how much work you are doing?1. Size of the force F - Bigger the force, the greater the amount of work you do 2. Distance s you push the car - The further you push it the greater the amount of work done
Work done by a force is defined as?The product of the force and the distance moves in the direction of the force W = F x s
What is the SI unit for both energy and workjoule (J)
The amount of work done, using W = F x s, shows what?Energy transferred
Define Joule (J)Amount of work done when one force of 1 newton moves a distance of 1 meters in the direction of the force
Work done by the force depends on the angle between the force and the distance it moves. What is the formula?Fs cosθ
When energy is transferred from you to the object. The what of the object has increased?gravitational potential energy, E`p
What is the formula for gravitational potential energygravitational potential energy g.p.e = weight x change in height △E`p = mg△h
In the equation △E`p = mg△h what does the h stand for?h stands for the vertical height through which the object moves
What is potential energyEnergy an object has because of its position or shape
What is the formula for kinetic energy1/2 x mass x speed^2
A decrease in g.p.e means whatan increase in k.e
What is the formula for calculating efficiency?(useful output energy ➗ total input energy) ✖️ 100
Energy can not be created or destroyed but it can beconverted from one form to another
Define powerrate of work done per unit of time
Define wattrate of working 1 joule per second
Power is measured in (1), named after (2), the scottish engineer famous for development of the (3)in the second half of the 18th century1. Watts 2. James Watt 3. Steam engine
Power can also be calculated using this equationforce x velocity