Chapter 5 Work, Energy and Power Flashcards

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1
Q

What is the equation for work done?

A

Work = Force x Distance moved in the direction of the force

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2
Q

What is work done?

A

Energy Transferred

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3
Q

How can you calculate work done at an angle?

A

Use triganometry

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4
Q

Name all the forms of energy and what they are

A

Kinetic - Motion
Gravitational - Energy based off gravitational fields
Chemical - Energy in the bonds
Elastic potential - Based off energy of the change in the shape of an object
Electrical potential - Based off the position of charges in an electric field
Nuclear - Energy in the nuclei of atoms
Radiant - EM Waves
Sound - Movement of atoms
Internal - Heat or thermal energy

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5
Q

What is the principle of the conservation of energy?

A

This is the principle that energy cannot be created or destroyed ( so the total energy in a closed system is conserved) and can only transformed from one type to another

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6
Q

What is the equation of kinetic energy?

A

Ke = 1/2mv^2

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7
Q

What is the equation for gravitational potential energy?

A

GPE = mgh

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8
Q

What is the equation for gravitational potential energy similar to?

A

The work done equation
WD = Force x Distance moved in a direction
GPE = (mg) x h

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9
Q

What equation can be when an object is dropped from a height? What are the assumptions?

A

mgh = 1/2mv^2

There are no resistive forces

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10
Q

What is power?

A

It is a measure of the rate of work done

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11
Q

What is the power equation?

A
P = W / T
Power = Work / Time
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12
Q

What are the other equations for power?

A

Power = (Force x Distance) / Time
so
Power = Force x Velocity
because distance / time is velocity

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13
Q

What is efficiency in terms of energy in a closed system?

A

It is a measure of how much of the energy inputted is outputted as usefull energy

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14
Q

What is the equation for efficiency

A

( Useful output energy / total input energy ) x 100

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