mechanics final
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Last updated 2:43 AM on 4/28/23
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10 Terms
1
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What is the equation for work done?
E=Fd
work done= force x distance
(must be parallel, x cos theta if not)
work done= force x distance
(must be parallel, x cos theta if not)
2
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What is work done measured in?
Joules J
3
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What is the equation for GPE (Gravitational potential energy)
E= mgh
GPE= mass x grav fielf strength x height
\
GPE= mass x grav fielf strength x height
\
4
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What is the equation for Kinetic energy
E=1/2 mv^2
kinetic energy= 1/2 x mass x speed^2
kinetic energy= 1/2 x mass x speed^2
5
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If something falls, why don’t you need it’s mass to calculate its final speed, assuming ideal conditions?
1/2mv^2=mgh
1/2v^2=gh
\
1/2v^2=gh
\
6
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If GPE at the top dos not equal KE at the bottom, where has the energy been lost?
Loat as work done against frictional forces (friction and air resistance)- increases thermal energy store of surroundings.
This energy can be used in E=Fd to find size of friction.
This energy can be used in E=Fd to find size of friction.
7
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Why does braking distance quadruple if you double your speed?
e=1/2mv^2
8
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What is the definition of internal energy?
The sum of kinetic energy and potential energy of an object/substance
9
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What does distance/time equal
average speed
10
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