Q: Answer the following question given this paragraph: You know that friction produces heat. That's why rubbing your hands together makes them warmer. But do you know why the rubbing produces heat? Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy. Heat from friction can be useful. It not only warms your hands. It also lets you light a match (see Figure below ). On the other hand, heat from friction can be a problem inside a car engine. It can cause the car to overheat. To reduce friction, oil is added to the engine. Oil coats the surfaces of moving parts and makes them slippery so there is less friction. Q: Friction causes the molecules on rubbing surfaces to move faster, which produces what? A:

OPTIONS:
- life
- precipitation
- cold
- heat

A: heat

input: OPTIONS:
- nuclear
- frictional
- tension
- gravity Now, answer this question: Answer the following question given this paragraph: Discussion As might have been expected, the player slides a shorter distance by sliding uphill. Note that the problem could also have been solved in terms of the forces directly and the work energy theorem, instead of using the potential energy. This method would have required combining the normal force and force of gravity vectors, which no longer cancel each other because they point in different directions, and friction, to find the net force. You could then use the net force and the net work to find the distance d that reduces the kinetic energy to zero. By applying conservation of energy and using the potential energy instead, we need only consider the gravitational potential energy. Q: What force increases a slide downhill and decreases a slide uphill? A:
A:
output: gravity

Answer the following question given this paragraph: Renewable energy resources include solar, water, wind, biomass, and geothermal power. These resources are usually replaced at the same rate that we use them. Scientists know that the Sun will continue to shine for billions of years. So we can use the solar energy without it ever running out. Water flows from high places to lower ones. Wind blows from areas of high pressure to areas of low pressure. We can use the flow of wind and water to generate power. We can count on wind and water to continue to flow! Burning wood ( Figure below ), is an example of biomass energy. Changing grains into biofuels is biomass energy. Biomass is renewable because we can plant new trees or crops to replace the ones we use. Geothermal energy uses water that was heated by hot rocks. There are always more hot rocks available to heat more water. Q: Biomass, solar, wind, water, and geothermal power are examples of what kinds of energy resources? A:

OPTIONS:
- mechanical
- electrical
- fossil fuel
- renewable

Answer: renewable

Problem: OPTIONS:
- terrible twos
- fetal stage
- pre-adolescence
- infancy
Q: Answer the following question given this paragraph: Scientific notation is a way of writing very large or very small numbers that uses exponents. Numbers are written in the format a 10 b . Q: When does a baby double in length and triple in weight? A:
Answer: infancy

Problem:OPTIONS:
- binary planet
- minor planet
- gas planet
- dwarf planet

Answer the following question given this paragraph: Is Ceres a planet? Ceres only has about 1.3% of the mass of the Earth's Moon. Its orbit is full of other smaller bodies. Its gravity was not high enough to clear its orbit. Ceres fails the fourth criterion for being a planet. Ceres is now considered a dwarf planet, the closest to the Sun. Q: What kind of planet do we consider ceres to be? A:
****
A: dwarf planet

Problem:OPTIONS:
- residual resources
- general resources
- orbital resources
- renewable resources

Answer the following question given this paragraph: Renewable resources can be renewed as they are used. An example is timber , which comes from trees. New trees can be planted to replace those that are cut down. Sunlight is a renewable resource. It seems we will never run out of that! What are some other renewable resources?. Q: What are resources that don't run out? A:
****
A:
renewable resources