Energy, Work And Power Flashcards

1
Q

What is work

A

Force applied over distance

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2
Q

What are the units for work

A

Joules

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3
Q

What are the units for energy

A

Joules

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4
Q

What are the units for power

A

Watts

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5
Q

When is no work done

A

No work is done if no distance is covered in the direction of the force applied

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6
Q

In order for work to be done what must be true about force and distance

A

Force and distance must be in the same direction

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7
Q

What is a joule

A

Newton* meters

Amount of energy needed to apply one Newton of force/ one meters distance

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8
Q

Any time work is done what must be used

A

Energy must be used to do work

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9
Q

Define energy

A

Energy is the ability to do work

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10
Q

What are the different categories of energy

A

Kinetic and potential

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11
Q

What is kinetic energy

A

Kinetic energy is the energy if motion, ex

Sound, light, heat, moving objects, electricity

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12
Q

What is potential energy

A

Potential is the energy of position or stored energy
Ex
Chemical energy, gpe, energy of position, but

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13
Q

What is the formula for kinetic energy and what variable matters most

A

KE= 1/2mV(2)

Most influential is velocity

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14
Q

What is the formula for potential energy and what variable is most valuable

A

GPE= w*h

Height is the most influential

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15
Q

What is the law of conservation go energy

A

Law of conservation of energy states that energy cannot be crated or destroyed only converted from one form to another

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16
Q

How does the law of conservation of energy relate to potential and kinetic energy

A

In the roller coaster lab, PE is converted to KE as the marble rolls down hill, KE is converted to PE as the marble rolls up hill

17
Q

If a roller coaster cars mass is doubled what happens to the amount of kinetic and potential energy that the car will have

A

Doubling the mass of the car doubles the potential energy at the top and therefore doubles the speed at the bottom

18
Q

If the cars velocity is doubled what will happen to the kinetic and potential energy

A

Doubling the velocity will mean the car has 4x as much energy

19
Q

As an object falls what happens to the value of potential energy

A

Potential decreases as an object falls (less hieght=less PE)

20
Q

As an object falls what happens to the value of kinetic energy

A

KE increases as an object falls because it’s velocity is increasing as PE is being converted into KE

21
Q

What is the energy transformation in lighting a match

A

Chemical energy to heat and light

22
Q

What is the energy transformation in turning in a light

A

Electrical energy to light

23
Q

What is the energy transformation in starting a car

A

Chemical energy to kinetic energy of moving energy

24
Q

What is the energy transformation in walking up stairs

A

Chemical energy to kinetic energy of moving body

25
What is the energy transformation in playing a piano
Chemical energy to kinetic and sound, moving fingers to moving strings into sound
26
What is the formula for work
w=f*d
27
What is the formula for power
P= w/t P= f*d -------- T
28
If you have a 50kg object and lift it a distance of 10 meters how much work so you do on the object, how much power of you do it in four seconds?
``` W= 5,000j P= 1250watts ```
29
If you exert 150 joules of energy in 15 seconds, what is your power
P= 10 watts
30
What is the difference between work and power
Work is done when energy is converted from one form to another, power is how fast the energy is converted or how fast the work is done
31
What is gpe
Potential to fall