4th Grade Science : Physical Science
Study concepts, example questions & explanations for 4th Grade Science
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Example Questions
Example Question #1 : Design And Test A Device To Convert Energy Between Forms
Meredith has to design a device that converts energy between two different forms. She decides she wants to convert electrical energy into sound and light. Which invention should she model her design after?
A television
A firecracker
A wood-burning stove
A battery-powered alarm clock
A television
The television is an excellent invention for Meredith to use as a model for her device. The television converts electrical energy into sound and light, so it can relay the programming the viewer would like to watch. Meredith can think about how the electricity is transformed and try to create something that lights up and makes noise.
Example Question #1 : Design And Test A Device To Convert Energy Between Forms
Gasoline is put into cars to make them run. The ability of gas to power vehicles is an example of ________ energy. It is transformed into mechanical energy, sound, and light.
mechanical
electrical
solar
chemical
chemical
In the car's engine, there is a transformation of chemical energy from the combustion of the gasoline into heat, which powers the engine to run. This energy is transformed into mechanical energy (or motion) when the car moves, light energy, and sound energy.
Example Question #1 : Convert Energy Forms
Marge wants to develop a device to convert energy forms and wants it to have little to no negative impact on the environment. Which type of energy should she use as her primary power source to accomplish this?
Hydropower
All of the answer choices are correct.
Solar
None of the answer choices are correct.
Wind
All of the answer choices are correct.
Many companies and even home inventors are turning to renewable resources to power their creations. Renewable resources have less of a negative impact on the planet when compared to traditional fossil fuels such as oil and coal. Solar power, wind energy, and hydropower are all examples of clean energy sources that Marge could use for her device.
Example Question #1 : Design And Test A Device To Convert Energy Between Forms
True or False: One form of energy can transform (convert) into another.
True
False
True
The statement in the question is correct. Energy is transformed (converted) all of the time, and often we don't even realize it. Many objects in our home are plugged into electrical outlets and draw on electricity provided by a power plant; they then transform this electrical energy into something useful to meet our needs. Often we use batteries to power objects; this is a conversion of chemical energy. A few examples you may have in your home include a toaster converting electrical energy into thermal and mechanical energy or a battery-powered flashlight converting chemical energy into light energy. You can search around your home and find lots of instances of energy transformation!
Example Question #2 : Design And Test A Device To Convert Energy Between Forms
True or False: When designing a device to convert energy it must use electricity to work.
False
True
False
The statement in the question is incorrect. Energy is transformed (converted) all of the time, and often we don't even realize it. Many objects in our home are plugged into electrical outlets and draw on electricity provided by a power plant; they then transform this electrical energy into something useful to meet our needs. But there are other types of energy transformation as well. Often we use batteries to power objects; this is a conversion of chemical energy. We apply heat to something like fireworks, and a chemical reaction occurs, transforming the powder inside into a flying display of beautiful colors and loud noises. Many homes use solar energy to power their devices and appliances within. Electricity is a popular choice for an energy source, but it is not the only option we have.
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