Flashcards in Energy, Work And Power Deck (31):

1

## What is work

### Force applied over distance

2

## What are the units for work

### Joules

3

## What are the units for energy

### Joules

4

## What are the units for power

### Watts

5

## When is no work done

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

6

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

### Force and distance must be in the same direction

7

## What is a joule

###
Newton* meters

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

8

## Any time work is done what must be used

### Energy must be used to do work

9

## Define energy

### Energy is the ability to do work

10

## What are the different categories of energy

### Kinetic and potential

11

## What is kinetic energy

###
Kinetic energy is the energy if motion, ex

Sound, light, heat, moving objects, electricity

12

## What is potential energy

###
Potential is the energy of position or stored energy

Ex

Chemical energy, gpe, energy of position, but

13

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

###
KE= 1/2mV(2)

Most influential is velocity

14

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

###
GPE= w*h

Height is the most influential

15

## What is the law of conservation go energy

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

16

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

### 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

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

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

18

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

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

19

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

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

20

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

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

21

## What is the energy transformation in lighting a match

### Chemical energy to heat and light

22

## What is the energy transformation in turning in a light

### Electrical energy to light

23

## What is the energy transformation in starting a car

### Chemical energy to kinetic energy of moving energy

24

## What is the energy transformation in walking up stairs

### 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