click below
click below
Normal Size Small Size show me how
Simple Machines
Question | Answer |
---|---|
Work | Something done whenever a force moves an object through a distance. |
Simple machine | One of six basic kinds of tools with few or no moving parts that make work easier |
Lever | A simple machine made of a bar or board that is supported underneath at the fulcrum; a bar that tilts about a pivot to move a load |
Fulcrum | The point on which a lever is supported and moves; the pivot on which a device such as a lever is supported so that it can balance, tilt or swing |
Inclined plane | A simple machine that is a flat surface with one end higher than the other; it enables a smaller force to lift a load over a longer distance |
Screw | A simple machine used to hold objects together. It is an inclined plane wrapped around a rod |
Pulley | A simple machine made of a wheel and a rope; a wheel with a grooved rim through which a rope, chain or belt is pulled to lift a load |
Wheel and axle | A simple machine that has a center rod attached to a wheel; a class of rotating machines in which effort applied to the wheel produces a useful movement in the axle or vice versa |
Wedge | A simple machine used to cut or split an object; a machine with a sloping side that moves to exert force |
Force | A push or pull that makes something move, slows it down or stops it, or the pressure that something exerts on an object. |
Mechanical advantage | the time and energy gained by using a machine to do work |
Gravity | Gravity the force that gives everything weight and pulls objects toward the Earth's center |
Gear | wheel with notches, or cogs, cut around its edge; used to transmit the turning movement of one wheel to a second wheel |
Friction | force of rubbing between two surfaces that slows movement and also produces heat or sound |
Wheel | a circular rotating part in a machine that moves around an axle |
Energy | the capacity to do work |
Compound machine | machine a machine that contains more than one simple machine |
Axel | the shaft on which a wheel turns |