Simple Machines
The Combination of a fulcrum and two fixed arms that move a load.
Lever
The gear that is generating the power for a machine
Driving Gear
Work is measured in Joules
Distance is measured in Meters
Force is measured in __________
Neutons
When a device reduces the amount of force we need to apply to accomplish work.
Mechanical Advantage
A flat surface tilted at an angle.
Inclined plane
The gear that is being rotated by another gear...
Driven Gear
If W=Fxd, what is the amount of work done by a student lifting a 5 N pencil 0.5 m?
2.5 J
A lever that has the fulcrum in the middle of the device would be a ...
Class 1 lever
A round object that changes the direction of a rope or strand.
Pulley
When the speed ratio is greater than 1, we gain speed from the device. When the speed ratio is less than 1, we gain ______________ from the device.
Mechanical Advantage
If Susie exerted 200J of work lifting a pencil case the was 10 N heavy, how far did she move it?
(W=Fxd)
20 m
A wheelbarrow would be an example of what class of lever
Class 2
An often sharp object that is used to separate two objects apart from each other
Wedge
Calculate the speed ratio if the Driving Gear has 20 teeth and the Driven Gear has 5 teeth.
(Speed Ratio = driving/driven)
Speed ratio of 4
If a student performs 400J of work but only has to exert 100J of energy on a lever, how much mechanical advantage is the lever providing?
M.A. 4
Student 1 picks up a pencil from the ground
Student 2 is holding a pencil in place
Which one of the students is accomplishing work (in the scientific sense)
Student 1
An inclined plane that is wrapped in a spiral shape around a single point.
Screw
Calculate the number of teeth needed on the driven gear if the Speed ratio is 0.5 and the Driving gear has 8 teeth.
(Speed Ratio = Driving/Driven)
16
If a lever has a load arm length of 2 m and an effort arm length of 10 m, what type of mechanical advantage might we expect to see?
5 M.A.
List 3 examples of a 3rd class lever
Answers Vary