P.S. Ch14 Vocab work/machines

A machine is...

• A device that makes work easier

• A tool used for manual labor

• A type of computer software

• A structure that supports weight

lever

• A rigid bar that is free to move around a fixed point (fulcrum)

• A type of simple machine that uses a wheel and axle

• A device that converts linear motion into rotational motion

• A tool used for measuring angles

effort

• the force applied to a simple machine

• the distance a machine moves

• the weight of the object being moved

• the speed of the machine

2nd class lever

• load in the middle; wheelbarrow, car-jack

• load at one end; seesaw

• load at the center; scissors

• load at the end; crowbar

Power

• the rate at which work is done --> work/time

• the total energy consumed over time

• the force applied to an object

• the distance covered by an object in motion

inclined plane

• a flat surface that does not change elevation

• a slanted surface along which a force moves an object to a different elevation

• a vertical surface that supports weight

• a curved surface that allows rolling motion

Mechanical Advantage (MA)

• the number of times that the machine increases an input force

• the ratio of output force to input force

• the efficiency of a machine in converting energy

• the total work done by a machine

compound machine

• A single simple machine that performs a specific task.

• A combination of two or more simple machines that operate together.

• A machine that requires no energy to function.

• A device that converts energy from one form to another.

3rd class lever

• effort in the middle; tweezers, baseball bat

• effort at one end; seesaw

• effort at the fulcrum; wheelbarrow

• effort at the other end; crowbar

wheel and axle

• A type of lever used for lifting heavy objects

• A disk and cylinder working together as one: steering wheel, pizza cutter

• A simple machine that rotates around a fixed point

• A mechanism that converts linear motion into rotational motion