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Question Group Info

This question group is public and is used in 6 tests.

Author: LBeth
No. Questions: 5
Created: Dec 9, 2016
Last Modified: 3 years ago

Simple Machines: What Is a Screw?

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Screw A screw is more than a small metal object. It is one of the six simple machines. A screw may be a simple, but it can do some helpful tasks. A screw is a useful machine because it changes rotational, or turning, motion into up-and-down motion. A screw can move an object up or down - like a person walking up or down a spiral staircase. A screw can also hold objects together - like two boards.

A screw is a type of inclined plane. Wrap an inclined plane around itself and it twists into a screw. The spirals of the screw are called threads. A screw with threads spaced far apart will be harder to turn than a screw with threads spaced closer together. But, a screw with closely spaced threads will need to be turned more, over a longer distance, than a screw with threads spaced farther apart.

Try This! Cut a triangle out of a piece of paper. Tape the base of the triangle to a pencil. Wrap the triangle around the pencil. You made a screw!
Grade 3 Simple Machines
Grade 3 Simple Machines
B.
A screw is actually another simple machine. Which one?
  1. lever
  2. wheel and axle
  3. inclined plane
  4. pulley
Grade 3 Simple Machines
C.
Which item(s) is used as an example of a screw in the passage?
  1. pencil
  2. person
  3. two boards
  4. spiral staircase