Power

Question 1

What is power about?

Answer 1

Rate of energy transferred.

Question 2

Power is the rate…

Answer 2

Of doing work.

How much per second.

Question 3

What is power not the same as?

Answer 3

Force.

Energy.

Question 4

What is a powerful machine?

Answer 4

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

Question 5

What is the formula for power?

Answer 5

Work done(or energy transferred)
Divided by.
Time taken.

Question 6

E
_ EQUALS

T

Answer 6

P - Power.

Question 7

What is power measured in?

Answer 7

Watts.

j/s.

Question 8

What does one watt equal too?

Answer 8

1 joule of energy transferred per second.

Question 9

What does power mean?

Answer 9

How much energy per second.

Question 10

Kj has to be turned into…

Answer 10

j.

Question 11

Minutes has to be turned into…

Answer 11

Seconds.

Question 12

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

Answer 12

The Timed Run Upstairs.

The Timed Acceleration.

Question 13

What happens in The Timed Run Upstairs?

Answer 13

Energy transferred is the potential energy you gain.

Question 14

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

Answer 14

Mgh/t.

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

Question 15

What does mgh/t mean?

Answer 15

M - Mass of the object.
G - Acceleration due to gravity = 10
H - Height of the object.
T - Time taken.

Question 16

What does mgh/t equal?

Answer 16

W - Power.

Question 17

What happens in The Timed Acceleration?

Answer 17

Energy transferred is kinetic energy you gain.

Question 18

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

Answer 18

1/2mv2/t

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

Question 19

What does 1/2mv2/t mean?

Answer 19

1/2
M - Mass of the object.
V2 - Velocity squared.
T - Time taken.

Question 20

How do you get accurate results from the experiments?

Answer 20

Repeat several times.