CHAPTER 5 (WORK AND MACHINES) WITH VERIFIED SOLUTIONS ALREADY GRADED A+

What is a slanted surface used to raise an object? inclined plane Name the device that does work with only one movement and changes the size or direction of a force. simple machine A bar that is free to pivot about fixed point is a _____. lever The rate at which work is done is _____. power What is transferred to an object when work is done? energy What do you get when you compare the output work of a machine with the input work? efficiency The amount by which a machine multiplies an effort force is called the _____ mechanical advantage What do two inclined planes put together form? wedge An inclined plane wrapped around a cylindrical post is a _____. screw What is the MA of a machine that changes only the direction of the force? 1 Two or more simple machines that work together are called _____. compound machine What is the unit used to measure power? watt The lever with a mechanical advantage greater than one is used to _____. increase force Name the two simple machines that are modified forms of a lever. pulley, wheel and axle Name the two simple machines that are forms of an inclined plane. screw, wedge A system of pulleys designed to multiply the effort force is a _____. block and tackle Two simple machines that are part of a bicycle are _____. gear, wheel and axle Why is the MA of a single, fixed pulley always one? the pulley changes only the direction of the effort force What can a simple machine not increase? the amount of work done What are the three parts of a lever? effort force, fulcrum, and resistance force What part is in the center of a first class lever? fulcrum The resistance force is also known as the _____. load What part is in the center of a second class lever? load/resistance force What part is in the center of a third class lever? effort force Name the three types of pulleys. fixed, movable, and block and tackle Energy The ability to cause change Work The transfer of energy that occurs when a force makes an object move Work Equation W=F*d Unit of Work Joule Power Equation P= W/t Unit of Power Watt Power Equation for Energy Transfer P= E/t Machine A device that makes doing work easier Input Force The force that is applied to the machine Output Force The force applied by the machine Mechanical Advantage The ratio of the output force to the input force Mechanical Advantage Equation MA= F(out)/F(in)