Free Grade 6 Reading Comprehension Passages & Answers

Rollercoasters do not actually have engines in the train cars. Instead, they rely entirely on the fundamental laws of physics to complete their thrilling circuits. As the train is slowly pulled up the very first, massive hill by a motorized chain, it builds up “potential energy.” This is stored energy based on the train’s height. The moment the train crests the hill and begins to plummet, gravity takes over. That stored potential energy is rapidly converted into “kinetic energy,” which is the energy of motion. The train reaches its maximum kinetic energy at the very bottom of the drop, giving it enough speed and momentum to conquer the rest of the loops and hills on the track.

Every day, we have to make choices about how to spend our time and money. In economics, whenever you choose to do one thing, you are giving up the chance to do something else. This hidden cost is called “opportunity cost.” For example, imagine you have saved $20. You really want to buy a new video game, but you also want to buy a ticket to a movie with your friends. Because your resources (your money) are limited, you must choose. If you choose the video game, the opportunity cost is the fun experience you missed at the movie theater. Understanding this concept helps people make smarter, more thoughtful decisions.

During the 12th century, a brilliant polymath named Ismail al-Jazari lived in Mesopotamia. Long before modern computers were invented, al-Jazari was designing programmable machines called “automata.” He is most famous for inventing the Elephant Clock, an incredibly complex water clock that stood over twenty feet tall. It used a system of sinking bowls, pulleys, and wooden figures to accurately measure time and strike a cymbal every half hour. Al-Jazari recorded all his designs in his famous manuscript, The Book of Knowledge of Ingenious Mechanical Devices, complete with colorful diagrams. His pioneering work laid the critical groundwork for modern mechanical engineering and robotics.

Computers seem incredibly smart, but at their core, they only understand two things: True and False. In computer science, this is represented by a 1 (True) or a 0 (False), known as binary code. To make complex decisions, computer programs use “Boolean logic” and special pathways called logic gates. For example, an AND gate requires two inputs. It will only output a “True” signal if both the first input AND the second input are True. If even one input is False, the gate outputs False. By stringing millions of these simple logic gates together in microchips, computers can process massive amounts of data and perform incredible tasks in a fraction of a second.

Twelve-year-old Ayan stared at the heavy brass lock on his grandfather’s antique puzzle box. Instead of a keyhole, the lock had three rotating dials, each requiring a number. A small note attached to the box read: “Find the interior angle of a regular hexagon.” Ayan smiled; he had just learned this in his O-Level math prep. A hexagon has 6 sides. He mentally applied the formula: subtract 2 from the number of sides, multiply by 180, and then divide by the total number of sides. Four times 180 was 720. Dividing 720 by 6 gave him his answer. He carefully spun the dials to 1-2-0. With a satisfying click, the brass lock popped open.