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Work
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1994-09-05
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@What units are work measured in?
Joules
Newtons
Watts
@The energy an object has because of its height above ground level is called:
Potential energy
Kinetic energy
Displacement energy
@A moving object has what kind of energy?
Kinetic
Potential
Inertia
@What does the Law Of Conservation Of Energy say?
Only the form of energy can be changed
Energy can be created and destroyed
Energy can only be created
@What is the unit of power?
Watt
Joule
Pascal
@1 Watt is:
The rate of using energy at a rate of 1 Joule per second
Moving 1 Kg a distance of 1 m
Lifting a 1Kg mass up 1 m in 1 minute
@Kinetic energy depends on:
mass and velocity
mass only
height and gravity
@In most machines much of the supplied energy is wasted. Why is this?
Friction coverts it to heat
They are not designed very well
They use fossil fuels
@Three types of potential energy are:
Gravitational, elastic & chemical
Chemical, friction & heat
Elastic, kinetic & gravitational
@Where does nearly all the energy used on the planet originate?
The sun
From oil and coal
From chemical reactions
@Electrical energy is often quoted in megawatts? How many watts are there in 1 megawatt?
1 million
1 thousand
10 thousand
@How many kilowatts is 2500 watts?
2.5
25.0
0.25
@The law of conservation of energy means:
energy can't be created or destroyed
energy must not be wasted
the worlds supply of fossil fuels is running out and can't be replaced
@In which of the following statements is a force doing work?
Railway engine pulling its carriages
A book resting on a table
A nail hanging from a magnet
@Which requires the most amount of work to be done - using a 1N force to lift an object 1m or using a 1N force to slide the object 1m along the floor?
They both require the same
Lifting the mass
Pushing the mass