Which characteristic is typical of simple machines?

Which simple machine is used when someone turns a round doorknob?

A kitchen knife separates food as its blade is pushed through it. Which simple machine does the blade act as?

Which simple machine forms the threaded metal base of a light bulb?

Which pair of simple machines works together in scissors?

Workers lift a bucket of cement using a rope passing over a grooved wheel. Which simple machine are they using?

Ignoring friction, what trade-off occurs when a crate is moved up a ramp instead of lifted straight to the same height?

Liza tests how ramp height affects the effort needed to pull a toy car. What should remain unchanged for a fair test?

Which instrument should Paolo use to measure the pulling effort needed to move a toy car up a ramp?

Use the dimensions in the diagram. What is the ideal mechanical advantage?

A plank used as a ramp is raised higher without changing its length or the load. Ignoring friction, what happens to the pulling effort?

Calculate the ideal mechanical advantage of the object shown using its labeled length and thickness.

Two cutting blades have the same length but different thicknesses. Which requires less effort to split the same material, ignoring friction?

The point where effort is applied travels 4 cm in one full turn. The screw advances 0.5 cm. What is its ideal mechanical advantage?

Two screws have equal-length handles but different thread spacing. Each advances one thread spacing per turn. Ignoring friction, which offers greater mechanical advantage?

Which force prevents a rubber doorstop from sliding along the floor when a door pushes against it?

A machine has $MA>1$. How does its output compare with its input?

What is a possible benefit of an ideal machine with $MA<1$?

Ignoring friction, what benefit does the illustrated setup provide?

Which class does the arrangement shown belong to?