It's the flat part on a knife or similar tool or weapon

It's a machine that produces electrical power

It's a device, often consisting of connecting sets of wheels with teeth (= points) around the edge, that controls how much power from an engine goes to the moving parts of a machine.

It's a device that makes a vehicle go slower or stop, or a pedal, bar, or handle that makes this device work.

A hard cover used to protect a vehicle or machine.

It's the central part of something, esp. of a wheel, or a center of activity

It's a pole or rod that forms the handle of a tool or weapon