work, energy, power Flashcards
1
Q
work
A
=force x displacement (joule, newton meter)
2
Q
energy
A
the ability to do work
3
Q
principle of conservation of energy
A
energy cannot be created or destroyed but can only be con verted from one form to another
4
Q
Ek
A
=1/2mv²
5
Q
Ep
A
=mgh
6
Q
power
A
=work done/time taken (watt= joule/second)
7
Q
percentage efficiency
A
= (output/input) x 100
8
Q
a body is in simple harmonic motion if
A
- its acceleration is directly proportional to its distance from a fixed point on its path
- its acceleration is always directed towards that point
9
Q
hookes law
A
when an object is bent, stretched or compressed by a displacement, the restoring force is directly proportional to the displacement (provided the elastic limit is not exceeded
