What are the six classical simple machines?

Gear, spring, motor, magnet, pump, and turbine Lever, wheel and axle, pulley, inclined plane, wedge, and screw Ramp, rope, hinge, bolt, crank, and valve Axle, bearing, cam, crankshaft, flywheel, and clutch

Mechanical advantage (MA) is defined as:

Input force divided by output force Output distance divided by input distance Output force divided by input force Input power divided by output power

A Class 1 lever has the fulcrum positioned:

At the effort end At the load end Between the effort and the load Beyond the load, further from the effort

A wheelbarrow is a Class 2 lever. In a Class 2 lever, which element is positioned between the fulcrum and the effort?

The effort The fulcrum The load The pivot pin

Tweezers and a fishing rod are examples of Class 3 levers. What is the defining characteristic of a Class 3 lever?

The load is applied between the fulcrum and the effort The effort is applied between the fulcrum and the load The fulcrum is positioned between the effort and the load The load and effort are at the same point

A single fixed pulley attached to a ceiling changes:

Both the direction and the magnitude of the effort force The direction of the effort force only — it does not increase mechanical advantage The speed of the load, making it move faster than the effort The weight of the load by reducing gravitational pull

A block-and-tackle system uses 4 rope segments to support a load. What is the ideal mechanical advantage?

2 4 8 1

An inclined plane (ramp) makes it easier to lift a heavy object by:

Reducing the weight of the object by storing some gravitational potential energy Spreading the work over a longer distance so the required force is reduced Eliminating friction between the object and the surface Converting gravitational energy into electrical energy to power an elevator

The screw is related to which other simple machine?

The wedge — a screw is a wedge that slides linearly The lever — a screw handle acts as a lever arm The inclined plane — a screw is an inclined plane wrapped around a cylinder The pulley — a screw redirects force around a curve

Why is actual mechanical advantage (AMA) always less than ideal mechanical advantage (IMA) for any real machine?

Gravity acts against the machine, reducing available force Real machines are built from heavier materials that weigh more than theoretical ones Friction consumes some of the input energy so less energy is available to do useful work on the load The work-energy principle does not apply to real machines

A doorknob is an example of which simple machine?

Lever Wedge Pulley Wheel and axle

A scissors is classified as which type of lever, given that the fulcrum (pivot pin) sits between the blades (load) and the finger loops (effort)?

Class 2 lever Class 3 lever Class 1 lever Wheel and axle