forces and energy (work done and power) Flashcards
1
Q
what is work done
A
a force moving on an object through a distance and the energy is transferred
2
Q
work done equation
A
force x distance
3
Q
what is power
A
rate of energy transfer
4
Q
power equation
A
work done / time taken (e/t)
5
Q
power units
A
W
6
Q
what is a force
A
a push or pull on an object by interacting with something
7
Q
contact force + examples
A
when something is touching the force so it can act
- friction, normal contact force.
8
Q
non contact force + examples
A
when it doesn’t have to be touching anything
- gravitational
9
Q
what is a magnetic field caused by
A
attraction or repulse between magnetic objects
10
Q
equllibrium
A
forces are balanced
11
Q
moment of force equation
A
force x distance
