Question | Answer |
pulley | a smiple machine that consists of a wheel over which a rope, chain, or wire passes |
Lever | a simple machine that consists of a bar that pivots at a fixed point called a fulcrum |
wedge | a simple machine that is made up of two inclined planes and that moves; often used for cutting |
screw | a simple machine that consists of a inclined plane wrapped around a cylinder |
wheel && axle | a simple machine consiting of two circular objects of different sizes; the wheel is the larger of the two circular objects |
inclined plane | a simple machine that is a straight, slanted surface, which facilitates the raising of loads; a ramp |
machine | a device that helps do work by either overcoming a force or changing the direction of the applied force |
work input | the work done on a machine; the product of the input force and the sitance through which the force is exterted. |
work output | the work done by a machin; the product of the output force and the distance through which the force is exerted |
mechanical advantage | a number that tells how many time a machine mulitples force |
mechanical efficiency | a quantity usually expresed as a percentage, that measures the ratio of work output to work input; it can be calculated by dividing work output by work input |
compound machine | a machine made of more than one simple machine |
power | the rate at whihch owkr is done or envergy is transformed |
watt | the unit used to express pwer; equivalent to joules per second (symbol W) |
Work | the transfer of energy to an object by using a force that causes the object to move in the direction of the force |
joule | the unit used to express energy; equivalent to the amount of work done by a force of 1 n acting through a distance of 1 m in the dircestion of the force (symbol J) |