A Screamingly Good Science Lesson
Elizabeth Kibler
1Amusement park rides give us thrills, exhilaration, and delight. If you pay attention, these rides can give you something else—a science lesson. Roller coasters are amazing rides that can twist and veer until you scream; however, these rides can also help to show us how types of energy work.
2Think about the first part of a roller coaster ride: A machine slowly pulls the cart higher and higher on a hill on the track. As the cart gets higher, it gains potential energy. Objects gain potential energy by being lifted farther from the ground. Potential energy is stored energy. The higher an object is from the ground, the more potential energy it has.
3When the cart reaches the top of the first hill, not only are riders’ stomachs screaming for mercy, but also the cart is at its maximum potential energy. Without warning, the energy-loaded cart begins to descend the first hill. As the cart careens down the hill, it has kinetic energy. Kinetic energy is different from potential energy. Kinetic energy is the energy of motion. All objects in motion have this energy. The kinetic energy propels that cart down the hill. Eventually, the cart will fight the forces of gravity and travel up another hill. On this uphill journey, the cart again begins to gain potential energy. The cart switched from potential energy, to kinetic energy, and back again. Therefore, a roller coaster ride is just the converting of kinetic energy and potential energy.
4After the first collection of potential energy, the cart does not use ropes, pulleys, or an engine. The cart, its wheels, and the laws of science are the only things that keep carts rolling firmly down the track. The air brakes on modern roller coasters bring the cart to a safe and smooth stop. If, however, a roller coaster had no brakes, it would ultimately stop on its own. The friction between the wheels and track and the friction between the cart and the air would eventually make a coaster stop. Think about a super ball. Although it gains potential energy every time it goes up, it eventually stops bouncing. In much the same way, the roller coaster cart would cease to move.
5Today, amusement park owners continuously try to outdo each other with bigger and better coasters. They believe that the more screaming their patrons do, the better the ride. Although the new rides of the day are going beyond what many thought was possible, it is all a matter of science. So, the next time you find yourself about to plunge down a gigantic roller coaster hill, try to think about the science of the amazing ride. Or, if you can’t stomach that much thought, just hold on and enjoy the ride.
Read the passage on the left to answer the following questions:
8)
A synonym for the word continuously in paragraph 5 is
A) angrily
B) dangerously.
C) famously.
D) repeatedly.
9)
In paragraph 1, the word veer means
A) stop
B) sway.
C) turn.
D) glide.
10)
A super ball stops bouncing because
A) gravity never lets it bounce.
B) it loses energy due to friction.
C) it cannot gain potential energy.
D) it gains too much kinetic energy.
11)
How are the details in this passage organized?
A) alphabetical order
B) problem and solution
C) order of importance
D) logical order
12)
In paragraph 3, the word propels means
A) helps.
B) pushes.
C) ignores.
D) watches.
13)
A synonym for the word careens in paragraph 3 is
A) drifts.
B) creeps.
C) speeds.
D) splashes.
14)
According to the author, what effect do the cart’s wheels have on most roller coasters?
A) The wheels cause friction.
B) The wheels eliminate friction.
C) The wheels give the cart kinetic energy.
D) The wheels give the cart potential energy.
Answers
After reading the passage we can now answer the questions.
8) Repeatedly.
In this context continuously means repeatedly.
9) The word veer in real sense means change direction. Therefore the best word to replace it is turn.
10) The super ball stops bouncing since it loses energy due to friction caused by air.
11) The paragraphs have been arranged in logical order since the details are systematic with each information builds to another in the next paragraph.
12) Propels means pushes.
13) Careen means moving fast and the best word to replace it is speeds.
14) The cart's wheels experience friction which contribute to the stopping of the cart.
The correct answer for 8 no. question is D. repeatedly.
The correct answer for 9 no. question is C.
Turn as veer means changing direction suddenly.
A super ball stops bouncing because it loses energy due to friction. So the right answer of question no. 10 is B.
The detail in the passage is organised in logical order. The answer for question no. 11 is D.
The answer of question no 12 is B. pushes. The answer for question no. 13 is A. drifts.
The answer for question no. 14 is A. The wheel causes friction.