Machines, Machines, Machines

When a force moves an object in the direction you are pushing or pulling that object Work

Since work involves transferring energy this is the unit for work Joule

Work divided by time power

The unit describing power watt

Something that changes the direction the force goes or overcomes force machine

The work you do on a machine – like pushing a lawnmower Work input

The work the machine does – like cutting the grass Work output

How many times the machine multiplies force Output force/Input force Mechanical advantage

How much work you get out of a machine compared to what you put in it. Work output/ Work Input Mechanical Efficiency

Fixed point on a lever – can be in different positions depending on the class of lever Fulcrum

A bar rotating around a fixed point – like a teeter-totter lever

A wheel that a rope goes over pulley

Using a fixed pulley and a moveable pulley together Block and Tackle

Two circular objects of different sizes Wheel and Axle

A straight, slanted surface like a ramp Inclined Plane

Two inclined planes that move – like a scissors Wedge

An inclined plane (flat slanted surface) wrapped around a cylinder Screw

A machine made up of two or more simple machines Compound Machine

A ll machines are made from these – lever, screw, pulley, wedge, inclined plane, and wheel and axle. Simple Machine