Chapter 3,3 - Work, energy and power Flashcards

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1
Q

Work Done

A

The product of the force and the distance moved in the direction of the force

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2
Q

Conservation of energy

A

The total energy in a closed system remains constant. Energy cannot be created or destroyed, it can only be transformed from one form to another

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3
Q

Closed System

A

A system in which all energy transfers are accounted for. Energy or matter cannot enter or leave the system

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4
Q

How work done is related to energy

A

Transfer of energy is equal to work done

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5
Q

How to derive formula for kinetic energy

A
work done -> F=ma -> SUVAT
E = Fd
E = mad
ad = E/m
ad = (1/2)(v^2-u^2) (From SUVAT)
consider u = 0
ad = (1/2)v^2
mad = (1/2)mv^2
E = (1/2)mv^2
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6
Q

How to derive formula for gravitational potential energy

A
E = Fd
E = mad
E = mgh (different letters)
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7
Q

Power

A

Work done per second

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8
Q

Power in terms of force

A

P=Fv

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9
Q

Efficiency of a system

A

useful energy / total input energy

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