What if two children push a swing at the same time? Would the swing go higher? Yes, together their force would be more. It is common for forces to be combined. Most objects on Earth have at least two forces acting on them. Do you know what one of them is? Of course, that force is gravity. How many forces do you have on you right now? Gravity pulls you down toward the center of Earth. Your legs exert a downward force. They hold you up against the pull of gravity. Consider the example in Figure 1.3. A book is resting on a table. Gravity pulls the book downward. It has a force of 20 newtons. At the same time, the table pushes the book upward. Its force is also 20 newtons. The table opposes the pull of gravity.

Question: "How many forces does an object have?"

Response: "Two forces acting on it"
OPTIONS:
- no
- yes

A: yes

Problem: When a stream or river slows down, it starts dropping its sediments. Larger sediments are dropped in steep areas. Some smaller sediments can still be carried by a slow moving stream or river. Smaller sediments are dropped as the slope becomes less steep. Alluvial Fans In arid regions, a mountain stream may flow onto flatter land. The stream comes to a stop rapidly. The deposits form an alluvial fan. Deposition also occurs when a stream or river empties into a large body of still water. In this case, a delta forms. A delta is shaped like a triangle. It spreads out into the body of water.

Question: "Are larger sediments dropped in steeper or less steep areas than smaller sediments in the same stream?"

Answer: "Steeper areas"

OPTIONS:
- no
- yes
Answer: yes

Question:
Hotel California My first thought: I was going crazy. Twenty-four hours of silence (vacuum, remember); was I hallucinating noises now? I heard it again. It was a fine bell, reminiscent of ancient stone churches and the towering cathedrals I'd seen in documentaries. And accompanying the bell, I saw a light. Now, there were two things here that made ridiculously small amounts of sense. First, the whole in-a-vacuum why's-there-a-bell thing. Second, I was floating in the dark remnants of my broken ship, and any conceivable light sources were not within view; starlight is a distinctly different color and significantly less bright. These signals were the heralds of my saviors. The first words they said to me meant nothing. I wasn't listening; I didn't care; I was going to live; I was going to keep breathing. Next to those, nothing else mattered. The recycled air tasted sweet in my mouth, and all thoughts that crossed my mind were cheap metaphors about life-giving substances and how breathing was like sex, only better. (I reserved the right to revise this opinion later.) When I was done mentally exclaiming over my impossible rescue, I looked around. The ship, it was odd and old, either so outdated or so heavily modified that I couldn't tell what make it was, and somehow, the crew standing around me fit the same description, a singularly atypical amalgamation of folk. And me, I guess I was one more piece in their puzzle. I was one more scrap to weld onto the rest, one more stranded survivor who was found. I was now one of them. After reading the above, is "He was one more scrap to weld and one more survivor who was found" the correct answer to the question "Who is the "Them" the writer refers to being one of?"? OPTIONS:
- no
- yes

Answer:
yes

Input: Fossils give clues about major geological events. Fossils can also give clues about past climates. Fossils of ocean animals on the top of a mountain? Ocean animals have been found on the Earths tallest mountain. Its hard to believe, but it is true. These fossils were found at the top of Mt. Everest. Mt. Everest is the highest mountain on Earth. These fossils showed that this entire area was once at the bottom of a sea. It can only mean that Mt. Everest was uplifted. In fact, the entire Himalaya mountain range was raised. It was forced up from the collision of two continents. Fossils of plants are found in Antarctica. Now, Antarctica is almost completely covered with ice. Plants do not grow in Antarctica. According to fossils, they once did. This means that Antarctica was once much warmer than it is now. These fossils tell us about Antarcticas past climate.
"How do we know that Mt. Everest used to be part of the sea?" is "Ocean fossils were found at the top of Mt. Everest"?

OPTIONS:
- no
- yes
Output: yes

Input: After his cousin Joe dies , Layne Vassimer and his girlfriend Macy , along with their friends Stephen , Maurice , Iris and Katrina , decide to clean up Joe's house with the intention of selling it . When they see it for the first time , they discover the house completely covered in plates of iron armor . The group also finds crop circles in the nearby cornfield . When Iris , one of their friends , suddenly disappears they realize something is really wrong . During a blackout , the house is attacked by aliens , who had previously killed Joe and abducted Iris . The group figures out the aliens are allergic to iron , Joe had covered the house in it to keep them out . They attempt to fight the aliens off , but the house is eventually blown up with Layne , Macy , and Katrina the only survivors . In the end , they drive off , listening to the radio . They hear a news report stating that the blackout they experienced affects five western states and parts of Canada . They also hear that people everywhere are being attacked by '' strange creatures . ''

Does the response "Iris goes missing" correctly answer the question "What happens to the group as they go to Joe's house?"?

OPTIONS:
- no
- yes
***
Output: yes

Input: Flowing water causes sediment to move. Flowing water can erode both rocks and soil. You have already learned that materials can dissolve in water. With enough time, even rocks can be dissolved by water. This process happens really slowly. It may take over a million years to dissolve a rock. It doesnt matter how big the rock is. With enough time, flowing water can dissolve it. Moving water also has the ability to move small pieces of rock and soil. How can water move a rock? Doesnt it need energy? Of course, water gets its energy because it is moving. Moving water has kinetic energy. Things that have more energy can do more work. When water stops moving it will have no energy. It will no longer be able to move the rock and soil. When this happens the rock and soil will settle to the bottom of the calm water. Scientists call this process deposition.

Does the response "Energy" correctly answer the question "How can water move a rock?"?

OPTIONS:
- no
- yes
***
Output:
yes