Levers
A lever is a bar that rotates around a what?
Fulcrum
Switchbacks and screws are what type of simple machine?
Inclined Plane
What is the formula for work?
W=Fxd
What is the formula for Pressure?
P=F/A
Provide the formula for Mechanical Advantage
Mechanical Advantage = Load Force/Effort Force
What class of lever is a pair of scissors?
Class 1
A screwdriver is an example of what type of machine?
Wheel and Axle
If you are pushing on an object, but that object does not move, is work being done?
No
What law states that pressure is exerted equally in all directions of a fluid and against the walls of its container?
Pascals Law
Any system that gives you a mechanical advantage makes the effort you need to use easier or harder?
Easier
What class of lever is a hockey stick?
Class 3
The first gear in a gear system is called the?
Driver
The work that a person does on the machine is called the __________________.
Work Input
What type of systems uses Pascals Law to make work easier?
Hydraulics
No machine will ever be 100% efficient due to what?
Friction
In a class 2 lever, where is the load located?
In the middle
A pulley that is attached to the load and moves with the load is a ______________ pulley
Moveable
The work that the machine does on the load it is moving is called the _________________.
Work Output
Calculate the Pressure of the small piston in a hydraulic system if the piston size is 3 m squared and the force is 15 N
5 Pa
If you put in 100 N of force pushing a lever, what is the mechanical advantage if the lever lifts a 300 N load?
3
If you move the fulcrum closer to the load in a class 1 lever, what happens to the effort?
It decreases
If the Driver Gear has 100 teeth and the Follow Gear has 25 teeth, what is the speed ratio of the gear system?
4
Calculate the work output if you pulled the rope of the pulley 10 meters, the pulley moved 3 meters and the load weighed 2 N.
6 J
If a small piston creates a pressure of 20 Pa, and the large piston has an area of 10 m squared, what is the force output of the large piston?
200 N
When using a machine, you put in 200 N worth of work, but the machine only accurately did 100 N worth, how efficient is that machine?
50%