4th Grade Science : 4th Grade Science
Study concepts, example questions & explanations for 4th Grade Science
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Example Questions
Example Question #1 : Observe How Energy Is Transferred By Sound
Which of the following is an example of energy being transferred by sound?
Clog dancing
A balloon popping
All of these are examples of energy being transferred by sound.
Meat sizzling on the grill
All of these are examples of energy being transferred by sound.
Each of the examples in this question are scenarios in which sound would be transferred because they all cause vibrations that travel through a medium.
Example Question #3 : Observe How Energy Is Transferred By Sound
What must happen for sound waves to form?
The frequency must decrease.
Sound waves are not reliant on anything to form.
The intensity must largely increase.
Matter must vibrate.
Matter must vibrate.
Sound is produced when something vibrates. Vibrations travel in longitudinal waves, which create areas of high and low pressure. Without vibrations, these soundwaves cannot be formed.
Example Question #4 : Observe How Energy Is Transferred By Sound
Lower pitched sounds have a lower frequency than higher-pitched sounds.
True
False
True
The vibrations of low pitched sounds move molecules at a slower rate than the vibrations of higher-pitched sounds. This means that there is more time between vibration pushes. More time between pushes means that the frequency is lower.
Example Question #1 : Observe How Energy Is Transferred By Heat
How does heat energy move?
From small objects to large objects
From cold objects to warm objects
From large objects to small objects
From warm objects to cold objects
From warm objects to cold objects
Heat is an energy that can be transferred just like sound, light, and electrical currents. We use heat in our everyday lives to cook food or warm our houses. Heat travels from warm objects to cold objects. This happens because the molecules hit each other, and the faster-moving molecules in the hot object spread that energy into the cooler object.
Example Question #2 : Observe How Energy Is Transferred By Heat
What is heat?
Heat is the flow of electrons – tiny, negatively charged particles in atoms.
Heat is the transfer of thermal energy.
Heat is made up of waves of electromagnetic energy.
Heat is the movement of energy by vibrations through substances in the form of waves.
Heat is the transfer of thermal energy.
Heat is a form of energy that we can feel. Heat is the transfer of thermal energy through vibrations between molecules. As the temperature of an object of substance increases, its molecules will begin to vibrate more quickly. Thermal energy is the movement of molecules that make up an object or substance.
Example Question #1 : Observe How Energy Is Transferred By Heat
As molecules move they rub against one another. This creates friction which raises the temperature of the molecules. The __________ the molecules move, the more thermal energy they are able to generate.
more organized
faster
messier
slower
faster
Thermal energy is another term for heat energy. Thermal or heat energy is generated when molecules rub against one another, causing friction. The faster the molecules move, the more heat energy is created. To measure how much thermal energy something has, we take its temperature with a thermometer.
Example Question #3 : Observe How Energy Is Transferred By Heat
Matt and Thome are going to roast marshmallows and need to use a device that is an insulator to hold over the fire. They don't want their hands to get burnt while cooking their food. They also don't want it to melt. What material should their device be made of?
Metal
Styrofoam
Wood
Plastic
Wood
Three of the items listed are insulators: wood, styrofoam, and plastic, but only one of them will not melt with the heat of the fire. Wood is the best option to keep their hands from burning and the device from melting. Metal is a conductor, so this device would get very hot and transfer heat to the boy's hands.
Example Question #1 : Observe How Energy Is Transferred By Heat
What are the three ways that heat can move or transfer?
Conduction, radiation, and convection
Heat cannot be transferred or move in three ways.
Conduction, radiation, and temperature
Kelvin, radiation, and convection
Conduction, radiation, and convection
The three ways heat can be moved or transferred are through conduction, radiation, and convection. Conduction is heat transfer between two objects that are touching. Radiation is the heat transfer through air or space by electromagnetic waves. Convection is heat transfer by a current of water or air.
Example Question #1 : Observe How Energy Is Transferred By Heat
Which of the following is an example of a good conductor of heat?
Fabric
Plastic
Metal
Clay
Metal
Metal is the best conductor of heat because its atoms are arranged in a way that allows electrons to travel freely, meaning they can pass energy more quickly.
Example Question #1 : Observe How Energy Is Transferred By Heat
The measure of how hot or cold something is is called _______________.
Kelvin
Fahrenheit
Temperature
Temperate
Temperature
Temperature is the mode by which we express hot and cold. We most commonly do so using measurements in either Fahrenheit or Celsius. Temperature is a manifestation of thermal energy and can be measured using a thermometer.
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