Power, Work, and Energy
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17 Terms
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Energy
is the physical quantity that enables a person or an object to do work.
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Energy
Without it, it is impossible for a person or object to do work.
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Energy
is the ability to do work.
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Joules ( J )
What unit is Energy?
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4\.19 J = 1 calorie
What is the conversion of 1 calorie to Joules?
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Energy
can be expressed more specifically by using the term WORK(W)
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Work
The Scalar Dot Product between Force and Displacement.
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in the direction of the force, energy
If you apply a force on an object and it covers a displacement ___________________ you have supplied ______to, or done WORK on, that object.
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Scalar
is a quantity with NO DIRECTION.
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cos
In the formula: W = F . d , What is the other meaning of “ . “?
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parallel
A dot product is basically a constraint on the formula. In this case it means that F and x must be??
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power
The rate of doing work
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No, he will not increase the work done if he pulls faster
If a man pulls a crate at a certain velocity, will he increase the work done if he pulls it faster but using the same force?
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Student B because they have less time
In a weightlifting class, Student A lifted a 40-kg barbell over his/her head for 15 times in 1 minute and Student B lifted the same barbell over his/her head for 15 times in 30 seconds. Who used up more power? Why?
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Kinetic Energy
KE
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Potential Energy (U)
PE
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Work-Energy Theorem
It basically means that if we impart work to an object it will undergo a CHANGE in speed and thus a change in KINETIC ENERGY.
Flashcards (22)