Chapter 3: Work & Machines Flashcards
0
Q
Joule
A
The SI unit of work is newton-meter.
1
Q
Work
A
Any time you exert a force on an object to move some distance.
2
Q
Power
A
The rate at which work is done.
3
Q
Watt
A
When work is measured in joules and time in seconds, the SI unit of power is the Joule per second.
4
Q
Machine
A
Devices that allow you to do work in an easier way.
5
Q
Input force
A
When you do work, the force you exert.
6
Q
Output force
A
The force excreted on an object by a machine.
7
Q
Mechanical advantage
A
The number of times a machine increases a force exerted on it.
8
Q
Efficiency
A
A machine compares output work to input work.
9
Q
Simple machine
A
The most basic
