Chapter 7 Flashcards
1
Q
Work
A
when a force acts through a distance
2
Q
work formula
A
Fd
3
Q
units of work
A
joules
4
Q
two categories of work
A
work done against another force, change the speed of an object
5
Q
when is work performed
A
only when F is pointed in the same direction as displacement
6
Q
power
A
the amount of work done per time it takes to do it
7
Q
power formula
A
P=work/t
8
Q
units of power
A
J/s
9
Q
mechanical energy
A
energy due to position or speed of an object
10
Q
when is mechanical energy conserved
A
when friction is neglected
11
Q
potiental energy
A
energy that is stored and held
12
Q
GPE
A
PE due to elevated postions
13
Q
GPE formula
A
mgh
14
Q
Kinetic energy
A
object is moving
15
Q
KE formula
A
1/2mv^2
16
Q
units of KE
A
Nm or J
17
Q
conservation of energy
A
cannot be created or destriyed
18
Q
Mechanical energy formula
A
E=KE + GPE
19
Q
Spring potential energy
A
1/2Kx^2
