Science 2 - Review

Front

What kind of energy does a book have when held 1 meter above the ground?

Back

the stored energy of an object due to its position or condition

Answer explanation

The book has gravitational potential energy because it is held at a height of 1 meter above the ground. This energy is stored due to its position, making the first answer choice correct.

Front

What type of energy is primarily being used by a bicycle due to its motion?

Back

the energy that an object has due to its motion

Answer explanation

As Grace rides down the hill, her bicycle gains speed, which means it has kinetic energy. This is the energy that an object has due to its motion, making it the correct choice.

Front

What type of energy is stored in the fuel used for refueling a car?

Back

chemical energy

Answer explanation

The fuel Raylan is using contains chemical energy, which is the energy stored in the bonds of chemical compounds. When the fuel is burned, this energy is released and converted into kinetic energy to power the car.

Front

What forms of energy are related to a roller coaster's climb and descent?

Back

potential and kinetic

Answer explanation

The correct forms of energy related to a roller coaster's climb and descent are potential energy, which is highest at the top, and kinetic energy, which increases as it descends. Fossil fuels and solar energy are not directly related.

Front

In Brody's living room during winter, the heat from a heater placed at one end always travels from _____ to _____.

Back

hot, cold

Answer explanation

In Brody's living room, heat from the heater moves from hot areas to cold areas, as heat naturally flows from higher to lower temperatures. Therefore, the correct answer is 'hot, cold'.

Front

How does the sun heat Earth mainly?

Back

radiation.

Answer explanation

The sun heats the Earth mainly through radiation, which is the transfer of energy in the form of electromagnetic waves. This is why Allyson and Aaron felt the warmth from the sun on the ground.

Front

How do producers contribute to the energy flow in an ecosystem?

Back

by converting sunlight into chemical energy through photosynthesis

Answer explanation

Producers contribute to energy flow by converting sunlight into chemical energy through photosynthesis. This process forms the base of the food chain, allowing energy to be transferred to consumers and decomposers.

Front

Deforestation leads to many negative situations on Earth as illustrated by this satellite image. Which of these is not a consequence of the deforestation of the rainforest?

Back

Deforestation leads to a decrease in fossil fuels.

Answer explanation

Deforestation leads to the extinction of species, erosion of soil, and destruction of habitats, but it does not decrease fossil fuels. Fossil fuels are not directly affected by rainforest deforestation.

Front

What is the example of when several groups of science students carry out the same experiment and get similar results?

Back

replication.

Answer explanation

This is an example of replication because several groups of science students repeated the same experiment and obtained similar results, confirming the original findings about earthworm habitats.

Front

What should Kamila and Brody do when they discover new scientific evidence that doesn't fit a well-known theory during a science fair?

Back

Old theories can be modified with new scientific evidence.

Answer explanation

Kamila and Brody should recognize that scientific theories can evolve. The correct approach is to modify old theories with new evidence, rather than discarding them entirely or assuming new theories are inherently better.