Chapter 4: Work and Energy Flashcards
1
Q
Equation for work
A
W=f*d
2
Q
Equation for power
A
P=w/t
3
Q
Unit of work
A
Joule (J)
4
Q
Unit of power
A
Watt
5
Q
A Joule (J) can be written as…
A
Nm
Kgm/s^2m
Kgm^2/s^2
6
Q
Common misconception about machines…
A
Machines don’t do more work, they just decrease the amount of force you apply
7
Q
Equation for Mechanical Advantage
A
MA=F in/F out
8
Q
Equation for Ideal Machines
A
F ind in=F outd out
9
Q
Unit for Mechanical Advantage
A
There is none
10
Q
Equation for Efficiency
A
Eff=w out/w in*100
11
Q
Definition of work
A
When a force (a push or pull) is applied to an object and the object moves.
12
Q
It it work if someone is carrying something?
A
No
13
Q
Energy is…
A
The ability to cause change
14
Q
Types of energy
A
Light
Thermal
Electrical
Sound
Nuclear
Mechanical (KE and PE)
15
Q
Kinetic energy is…
A
Energy due to an objects motion
