9.1: Work & Power Flashcards
What is the formula for work?
force x distance
Solve for work done using 5N or force to lift object up 0.5m stairs.
w = 2.5N x m
What simple machine make use or turning?
Pulley, Wheel & Axel
What is a pulley?
Simple machine with grooved wheel and cable
What are the 3 types of pulleys?
Fixed, Movable, Block & Tackle
What is a fixed pulley?
Changes direction of force; not amt. applied MA = 1
What is a movable pulley?
Decreases amt. of input force; doesn’t change direction MA = 2
What is a block & tackle pulley?
Combo of both fixed and movable MA = 3
What is work?
Force put on an object that causes it to move
What is force?
Push/Pull
What is power?
Rate at which work is done
What is a joule?
SI Unit of work
What is a machine?
Allows work to be easier by changing distance, direction, and amount or force exerted
What is the equation for force?
F = m/a
What is the input force?
Force you exert
What is the input distance?
Any length traveled to do work
What is output force?
Force exerted on object by machine
What is mechanical advantage?
of times machine increases a force exerted on it
What is the formula for MA?
Output force/Input force
What are the 3 types on inclined planes?
Ramp, Screw, Wedge
What is a ramp?
Spreads input force over longer distance
What is a screw?
Acts as an inclined plane wrapped around cylinder
What is a wedge?
Move inclined plane into object
What is a fulcrum?
Fixed pint which lever rotates
