P2 - Power Flashcards
1
Q
What is the equation for power?
A
Power = Work done or Energy Transferred / Time Taken
2
Q
What unit is power measured in? [2]
A
Watts or J/s.
3
Q
What are two experiments to measure the power output of a person?
A
1) timed run upstairs.
2) timed acceleration.
4
Q
What is the energy transferred during a timed run upstairs?
A
The potential energy you gain (mgh).
5
Q
What is the formula for a timed run upstairs?
A
Power = mgh / t.
6
Q
What is the energy transferred during a timed acceleration?
A
The kinetic energy gained (1/2mv2).
7
Q
What is the formula for a timed acceleration?
A
Power = 1/2mv2 / t.
8
Q
What is a powerful machine?
A
One which transfers a lot of energy is a short space of time.
