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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

How do you get accurate results from the experiments?

Repeat several times.