Simple Machines
What type of simple machine is an axe
Wedge
What is the formula for work?
W = F × d
Is a bee colony physical or social system?
Social system
What is the purpose of a fire alarm system?
Alert people of danger (fire)
This tool uses a grooved wheel and rope
A pulley
What type of lever is a seesaw?
A 1st class lever
What unit is used to measure work?
Joules
Is a bicycle a physical or social system?
Physical system
In a healthcare system, what might be one input and one output?
Input – medical staff, equipment, patient info;
Output – diagnosis, treatment, patient care.
You turn this to hold wood together
A screw
Name two simple machines that are based on the inclined plane
Wedge and screw
What is the conversion from Joules to kJ
1000 J = 1 kJ
What type of system is a hospital ER?
Social System
What is a subsystem in a computer?
ex. cooling system, storage system
This simple machine uses two circular parts to move objects
Wheel and axle
A broom can act as what type of simple machine?
Lever
Calculate the work done when pushing with 30 N for 4 m
120 J
Name one natural physical system
ex. Digestive System
What is the purpose of the gear mechanism in a bicycle?
To transfer force from the pedals to the wheels and adjust speed
Identify this machine: You press one side to cut. What type of lever is it?
Scissors - 1st class lever
You’re asked to design a tool that can lift a heavy load using the least amount of input force possible. You can only use simple machines. Which two simple machines would you combine
A pulley and an inclined plane.
A 80 N force lifts a 40 N load 3m. What’s the efficiency?
ME = 50%
A city transit system includes buses, drivers, ticket scanners, GPS tracking, and a mobile app for users to check bus times.
Is this a physical system, a social system, or both?
It’s a physical system because it includes mechanical and electronic components like buses, ticket scanners, and GPS devices.
It’s also a social system because it relies on people (drivers, passengers, dispatchers) interacting to provide a service.
ou are designing a vending machine. What are one key input and one key output?
Inputs – money, selection buttons
Outputs – product, change
I’m a compound machine that uses a wheel and axle and a lever. You turn me to open. What am I?
A doorknob