lever
All screws are used as simple machines.
they can be used anytime
as it reels
in a gravity field it can find 2 equal masses
A wedge
All screws are used as simple machines.
No it is not.
pulley
fasten?
A pulley.
simple machines are used by being pulled or pushed
lever
No it is not.
balance machine
wedge
Wool
A winch.