click below
click below
Normal Size Small Size show me how
Chapter 8 vocab
Question | Answer |
---|---|
What is Work? | The transfer of energy to an object by using a force that causes the object to move in the direction of the force. |
What is a Joule? | The unit used to express energy; equivalent to the amt. of work done by a force of 1 N acting through a distance of 1 N in the direction of the force. |
What is Power? | The rate at which work is done or energy is transformed. |
What is a Watt? | The unit used to express power; equivalent to joules per second. |
What is a Machine? | A device that helps to work by either overcoming a force or changing the direction of the applied force. |
What is Work Input? | The work done on a machine; the product of the input force and the distance through which the force is exerted. |
What is Work Output? | The work done by a machine; the product of the output force and the distance through which the force is exerted. |
What is Mechanical Advantage? | A number that tells how many times a machine multiplies force. |
What is Mechanical Efficiency? | A quantity, usually expressed as a percentage, that measures the ratio of work output to input; it can be caculated by dividing work putput by work input. |
What is a Lever? | A simple machine that consists of a bar that pivots at a fixed point called a fulcrum. |
What is a Weel and Axle? | A simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects. |
What is an Inclined Plane? | A simple machine hat is straight, slanted surface, which facilitates the raising of loads; a ramp. |
What is a Wedge? | a simple machine that is made up of two inclined planes and that moves; often used for cutting. |
What is a Wedge? | a simple machine that is made up of two inclined planes and that moves; often used for cutting. |
What is a Screw? | A simple machine that consists of an inclined plane wrapped around a cylinder. |
What is a Compund Machine? | A machine made of more than one simple machine. |