Flashcards in Power Deck (20):

1

## What is power about?

### Rate of energy transferred.

2

## Power is the rate...

###
Of doing work.

How much per second.

3

## What is power not the same as?

###
Force.

Energy.

4

## What is a powerful machine?

### It transfers a lot of energy in a short space of time.

5

## What is the formula for power?

###
Work done(or energy transferred)

Divided by.

Time taken.

6

##
E

_ EQUALS

T

### P - Power.

7

## What is power measured in?

###
Watts.

j/s.

8

## What does one watt equal too?

### 1 joule of energy transferred per second.

9

## What does power mean?

### How much energy per second.

10

## Kj has to be turned into...

### j.

11

## Minutes has to be turned into...

### Seconds.

12

## Name 2 ways to measure the power output of a person?

###
The Timed Run Upstairs.

The Timed Acceleration.

13

## What happens in The Timed Run Upstairs?

### Energy transferred is the potential energy you gain.

14

## How do you get the power output from The Timed Run Upstairs?

###
Mgh/t.

Mass x acceleration due to gravity x height divided by time taken.

15

## What does mgh/t mean?

###
M - Mass of the object.

G - Acceleration due to gravity = 10

H - Height of the object.

T - Time taken.

16

## What does mgh/t equal?

### W - Power.

17

## What happens in The Timed Acceleration?

### Energy transferred is kinetic energy you gain.

18

## How do you get the power output from The Timed Acceleration?

###
1/2mv2/t

1/2 x mass x velocity2 divided by time taken.

19

## What does 1/2mv2/t mean?

###
1/2

M - Mass of the object.

V2 - Velocity squared.

T - Time taken.

20