True or False: a screw is an inclined plane wrapped around a cylindrical post.
True!
Ramp
What are the 3 types of pulleys?
Fixed pulley
Moveable pulley
Compound pulley
Draw a first class lever
A machine that is made of two or more simple machines is called a...
Complex machine
What is the vertical distance between the threads on a screw called?
The pitch
How do you calculate (formula) the mechanical advantage of an inclined plane and wedge?
hypotenuse/height
What type of pulley is this?
Fixed pulley
Draw a second class lever
A group of parts that work together to perform a single function within a machine.
System
True or False. The wheel and axle are a combination of two different diameter wheels that turn separately
False: The wheel and axle are a combination of two different diameter wheels that turn together
True or False: After applying the force, the wedge redirects the outward force to an downward force.
False! After applying the force the wedge redirects the downward force to an outward force.
What type of pulley is this?
Compound pulley
What is the word for the point on which a lever rests or is supported and on which it pivots?
Fulcrum
What is the name of the machine that is used for transferring water from a low-lying body of water into irrigation ditches?
Archimedes screw
What is the mechanical advantage of a screw with a pitch of ⅛, and a circumference of 0.79 inches?
circumference of a screw/pitch of a screw
0.79/(1/8) = 6.32
You are moving boxes into a moving van. Draw the picture and point to where the effort or force is coming from in this diagram:
The force is coming from pushing the box up the ramp from the bottom.
What are the 2 components of a pulley?
A pulley consists of a rope or cable moving on a grooved wheel
What class of lever is a hockey stick?
Class 3.
This simple machine helps reduce the force needed to lift an object, by changing the direction of the force applied.
Pulley
If a wheel's radius is 60cm and its axle is 30cm, what is the mechanical advantage of the wheel and axle?
60/30 = 2
What is the mechanical advantage of an inclined plane that is 10 meters long and 7 meters high?
hypotenuse/height.
10m/7m
= 1.4
What is the mechanical advantage of this pulley?
6
The distance from the fulcrum to the effort force applied is 120cm. The distance from the fulcrum to the load applied to the lever is 30cm. What is the mechanical advantage of the lever?
120 cm/30 cm
= 4
What were the 3 cartoons we watched in class?