Physics Flashcards
If a crane uses 4500n of force to lift a girder 20m how much work was done?
90000nm
How do you calculate MA
Load force /effort force
An effort force of 30n is applied to a screwdriver to pry the lid off a can of paint. The screwdriver applies 90n of force to the lid what is the MA of the screw driver
=Load/effort
=90N/ 30N
=3 MA
A lever is used to lift a heavy rock. The rock has a mass of 800N. It requires 200N of force to lift the rock using the lever. What is the MA?
=Load/Effort
=800N/200N
=4MA
.
7km converted to m
7x1000=7000m
Efficient system looks like…
Small input over big distance
Inefficient system looks like…
Big input over small distance
What is a system
Collection of components that work together to use inputs and processes to get outputs
Examples of systems
School system, cooking pizza, sharpening pencil, washing clothes
What’s a input + examples
- Anything out in the system
- items used by the process to achieve the output
Examples - pizza base with toppings, dirty clothes with soap, people
What’s a process + examples
-series of actions to achieve output
Examples - washing machine, oven, pencil sharpener
What’s a output + examples
- the results when the inputs are processed
-whatever comes out of the system
Examples -pizza, clean clothes, sharp pencil
Why have robots been adopted in many industries
-To take humans out of hazardous jobs
-don’t need breaks
-efficient
What industries will move towards robot use
Schools
Grocery stores
Maids
Agriculture
Ethical concerns of using robots
They are taking humans jobs
Privacy
Safety
Artificial error
How would robots make our lives easier
Promote more human jobs (fixing/updating)
Complete unliked human jobs
Lever
Decreeing the amount of force needed and increasing the distance the force is applied
How do you achieve more MA on a lever
Move fulcrum closer to load
Inclined planes
Instead of lifting up the item, you can push it for a farther distance
Pulley
Changes the direction of force
Gear
When one gear is turned, the other turns as well
What is mechanical advantage
The amount of mechanical advantage a simple machine provides
How to calculate MA
Load/effort or
output force/input force
What does <1 mean
More than one, so use mechanical advantage
