Simple Machines Trivia
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98 free Simple Machines trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Six simple machines explain almost every tool in your house, from the bottle opener to the doorknob. This trivia about simple machines covers the lever and its three classes, pulleys and the block and tackle, inclined planes, wedges, screws and the wheel and axle, plus Archimedes, mechanical advantage and the history behind each one. Built for classroom review and science quiz nights. Every answer is sourced, with a short explanation so you learn something even when you miss.
30 of 98 questions with answers and explanations. Play the quiz
Q 01A single fixed pulley changes only what?
Pull direction
Pull direction is all that changes: you haul down on the rope instead of heaving the weight up. Add a second pulley that moves with the weight, and the force needed is halved.
Q 02The ratio of a machine's output force to the force applied is called what?
Mechanical advantage
Mechanical advantage need not be above 1. Tools such as tongs score less, giving up force on purpose to gain reach and speed.
Q 03A bicycle is an example of what kind of machine?
A compound machine
A compound machine links simple ones together, as a bicycle does with wheels, levers and pulleys. In a bench vice the long handle is a lever that turns a screw, so the jaws grip far harder than any hand could.
Q 04When several simple machines are linked in series, the overall force multiplication equals what?
The product of their ratios
The product of their ratios, not the sum: two machines that each triple your force give nine times, not six, when one drives the other.
Q 05When a machine multiplies force, what does the load give up in return?
Distance moved
Distance moved shrinks as force grows: to double your lifting force with a lever, your hand must travel twice as far as the weight rises.
Q 06Which medieval siege engine is a giant lever that hurls stones when its counterweight drops?
Trebuchet
Trebuchet crews hung a great weight of stone or metal on the arm's short end; when it dropped, the long end whipped up and flung the missile. The engines stayed in use until gunpowder weapons took over.
Q 07Which machine was missing from the ancient Greeks' classic list of five?
Inclined plane
Inclined plane: the Greeks hauled loads up ramps but left the slope off their list, probably because it just sits there while the load does the moving. It joined many centuries later.
Q 08Heron of Alexandria's list of five devices that "set a load in motion" appears in which of his treatises?
Mechanics
Mechanics was written in Greek but survives only in an Arabic translation. Aimed at architects, it explains how to raise heavy weights with a handful of simple machines.
Q 09Who wrote Le Mecaniche, a treatise on simple machines, around 1600?
Galileo Galilei
Galileo Galilei drafted it for his private students and let it circulate in manuscript. It was a Frenchman, Marin Mersenne, who published it, bringing out his own translation in 1634.
Q 10The big wooden screw used to squeeze grapes for wine was borrowed for which 15th-century invention?
The printing press
The printing press of Johannes Gutenberg, built around 1440, used the screw to squeeze paper flat against inked type. The same device had pressed grapes and olives since Roman times.
Q 11The turning effect of a force about a pivot, which a longer lever arm increases, is called what?
Torque
Torque comes from the Latin torquere, to twist, the verb the Romans also used for torture. Double the length of a spanner and the same push gives twice the twist.
Q 12The word "lever" comes from Latin levare, rooted in levis, meaning what?
Light
Light, as in not heavy: Latin levare, to raise, grew out of it. The same Latin word gave English "elevate" and "levity", and a kindred root gave "lung", literally the light organ.
Q 13In the Egyptian Book of the Dead, a balance scale, a simple lever, weighs the dead person's heart against what?
A feather
A feather, the ostrich plume of Ma'at, goddess of truth, sits in the other pan. A heart that proved heavier was fed to the monster Ammut.
Q 21A lever multiplies force by the ratio of what?
Distances from the fulcrum
Distances from the fulcrum decide it: push three times as far from the pivot as the weight sits, and the lever triples your force. Archimedes proved the rule.
Q 22Archimedes proved the law of the lever using what kind of reasoning?
Geometric
Geometric: in On the Equilibrium of Planes he treats the lever like a theorem, laying down seven postulates and deducing the law from them, proposition by proposition.
Q 23An "ideal" machine is assumed to be free of what?
Friction
Friction is assumed away, along with any bending or wear in the parts, so an ideal machine passes on every bit of the effort put in. Real ones always lose a little as heat.
Q 14Given a place to stand, Archimedes reportedly said he could move what?
The Earth
The Earth. The boast reaches us only through later writers such as Plutarch and Pappus, and it made his point that, given the right machine, a small force can move any weight at all.
Q 15Which tool is a Class II lever, with the load between the effort and the fulcrum?
A nutcracker
A nutcracker has its hinge at one end and your hand at the other, with the nut in between, so the squeeze on the shell is far stronger than your grip.
Q 16The energy a machine passes on is measured in which unit, named after a brewer's son from Salford?
The joule
The joule honours James Prescott Joule, who ran the family brewery and did physics as a hobby. His experiments showed that heat and mechanical effort are two forms of the same thing.
Q 17A pair of tweezers, with the effort between the fulcrum and the load, is which class of lever?
Third
Third: you squeeze partway along the arms, so your fingers move a little and the tips move more. Tweezers give up force on purpose, in exchange for reach and fine control.
Q 18Which tool is a Class I lever, with the fulcrum between the effort and the load?
A crowbar
A crowbar pivots on a point between your hands and the thing being prised up, so a long push on the handle becomes a short, powerful lift at the tip.
Q 19Which part of the human body is cited as a Class III lever?
The mandible (jaw)
The mandible (jaw) joins the forearm as one of the body's Class III levers, built for speed and range of movement instead of raw force.
Q 20Financiers took which simple-machine word for borrowing to multiply returns?
Leverage
Leverage first meant the action of a lever, in the 1720s. The money sense keeps the picture: borrowed funds let a relatively small investment earn like a much larger one.
Q 24Several pulleys assembled to lift heavy loads with a rope form what device?
A block and tackle
A block and tackle is riggers' language: a cased pulley is a block, and the rope run through a pair of them makes the tackle.
Q 25The ideal force multiplication of a pulley set equals the number of what?
Rope sections supporting the load
Rope sections supporting the load share its weight equally, so with four of them each strand carries a quarter, and a quarter is all you have to pull.
Q 26According to Plutarch, Archimedes demonstrated compound pulleys by pulling what toward himself?
A fully laden ship
A fully laden ship, passengers and cargo aboard, which Plutarch says he drew in by hand while sitting far off. The king had challenged him to back up his boast that a small force could move any weight.
Q 27Besides rope and cable, what else is commonly run over a pulley's wheel to transmit power?
A chain
A chain runs on toothed pulleys called sprockets, whose teeth catch each link, as on a bicycle. A belt does the same job on a smooth wheel.
Q 28A ramp multiplies force by its sloped length divided by what?
The height it spans
The height it spans: to raise a 100-pound crate 2 feet, an 8-foot ramp is four times as long as it is high, so a push of about 25 pounds will do.
Q 29The steepest angle at which a load rests on a ramp without sliding is the angle of what?
Repose
Repose, as in rest: tilt the ramp any steeper and the load starts to slide. The same angle explains why poured sand always settles into a cone of the same slope.
Q 30The Diolkos, an ancient paved trackway, let crews haul ships overland across which isthmus?
Corinth
Corinth: for some 650 years, from about 600 BC, the track spared ships the long and dangerous voyage around the Peloponnese.