A group of students was tasked with creating a simple machine that models a screw. Below is a list of student models and the steps they took to create them. Which of the following models best matches a screw?

Question

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1 point
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Student A: Takes two popsicle sticks that act as levers and attaches a fulcrum to them to serve as a pivot. At the other end of the fulcrum, two wedges are attached to complete the machine.
Student B: Cuts out a right triangle from a piece of paper to create an inclined plane and wraps it around a pencil
Student C: Folds paper together to create a large conical opening that acts as an inclined plane that sits on top of a hollow tube.
Student D: Cuts out a piece of paper in the shape of a doughnut and puts it on top of straw in the shape of a cylinder. The paper can spin around and functions like a wheel and axle.

Answer 1

Student D's model best matches a screw. The paper doughnut on top of the straw cylinder mimics the shape and function of a screw, with the spinning motion representing how a screw is turned to create movement.