P2: Work and Energy Flashcards
1
Q
What is work done?
A
Energy transferred
2
Q
The amount of work done, force and distance are related by what equation?
A
Work done (J) = force applied (N) x distance moved in direction of force
(M)
3
Q
What is work done against frictional forces mainly transferred into?
A
Heat
4
Q
What is power?
A
Work done in a given time
5
Q
How can power be calculated?
A
Power (W) = work done (j) / time (s)
6
Q
What is gravitational potential energy?
A
The energy that an object has by virtue of its position in a gravitational field
7
Q
How can GPE be calculated?
A
GPE (J) = Mass (Kg) x gravitational field strength (N/Kg) x Height (m)
8
Q
What does the kinetic energy of a body depend on?
A
Mass and speed
9
Q
How can kinetic energy be calculated?
A
Kinetic energy (J) = 1/2 x mass (kg) x speed2 (m/s)2
10
Q
When is work done?
A
When a force causes a body to move through a distance
