Forces of Motion
Which of the following is the best example of stored energy being converted into another form of energy?
A. a swinging bat hitting a pitched ball
B. pulling the band back on a slingshot
C. releasing the string of a bow and arrow
D. a battery powered flashlight that is turned off
C. releasing the string of a bow and arrow
How do the lenses in eyeglasses help people see more clearly?
A. The lenses in the glasses block all light waves to make it easier to see.
B. The lenses in the glasses change the color of light waves to improve vision.
C. The lenses in the glasses bend light waves to focus them better on the eyes.
D. The lenses in the glasses speed up light waves to make the objects appear closer.
C. The lenses in the glasses bend light waves to focus them better on the eyes.
Some species of sea turtles lay a large number of eggs during reproduction. How does this benefit the sea turtles?
A. The sea turtles are able to compete for more space.
B. The sea turtles are able to swim longer distances.
C. It increases the chances of more turtles surviving.
D. It decreases the number of predators in the area.
C. It increases the chances of more turtles surviving.
A. river water moving rapidly
B. slow moving water in a valley
C. strong winds in a desert
D. leaves falling from a tree
D. leaves falling from a tree
How do digital devices use waves to make listening to sound recordings possible?
A. by increasing the device's battery capacity
B. by making the physical size of the speakers smaller
C. by using colorful images on the screen to showcase the sound
D. by converting digital audio into sound waves for speakers
D. by converting digital audio into sound waves for speakers
Students choose playground activities to demonstrate energy transfer. Which activity shows a transfer of potential energy to kinetic energy?
A. Sliding from the top of a slide
B. Hanging from monkey bars
C. Sitting on a bench
D. Hiding behind a tree
A. Sliding from the top of a slide
How does using a computer help human senses work better by using waves?
A. Computers stop light waves to help us feel the texture of objects.
B. Computers use sound waves to make objects on the screen look bigger.
C. Computers use light waves to display clear and detailed images on the screen.
D. Computers change light waves into taste signals so we can taste different things.
C. Computers use light waves to display clear and detailed images on the screen
Farmers often use fertilizer on their farms. Fertilizer is also used in gardens. Some people argue that fertilizer is bad for the environment.
Which effect of using fertilizer best supports the argument that fertilizer is bad for the environment?
A. Fertilizer stops soil erosion in fields.
B. Fertilizer puts nutrients back into the soil.
C. Fertilizer makes plants grow bigger and faster.
D. Fertilizer disrupts the healthy balance of the soil.
D. Fertilizer disrupts the healthy balance of the soil.
On a forest field trip, a student is assigned a list of observations to make. One observation the student looks for is evidence of mechanical weathering. Which activity would allow the student to check mechanical weathering off the list?
A. An acorn falling out of a tree
B. An ant placing a soil particle on an anthill
C. A puddle getting smaller as the sun shines on it
D. A stone becoming smooth in a flowing riverbed
D. A stone becoming smooth in a flowing riverbed
In what ways have engineers met societal demands in the development of cell phones?
A. by ignoring the need for convenience of portability
B. by creating smaller and portable devices with advanced features
C. by increasing the size and weight, providing durability and stability
D. by making them only available to a select privileged group of people
B. by creating smaller and portable devices with advanced features
A girl rode her bicycle at a steady speed across pavement.
When the girl rode across a grassy field, her speed slowed. What caused the girl to travel more slowly on the grass than the pavement?
A. An increase in friction
B. A decrease in friction
C. An increase in gravity
D.A decrease in gravity
A. An increase in friction
Which of these best explains why objects have color?
A. Objects create the color they need to be seen.
B. Colors of objects are created by the lens in the eye.
C. Objects become the color of the light passing through them.
D. Objects absorb some wavelengths of light while reflecting others.
D. Objects absorb some wavelengths of light while reflecting others.
What would happen if a new large predator was put into a sea where it had not lived before?
A. The sea would become balanced again.
B. The sea animals it eats would become fewer.
C. All the other predators would disappear right away.
D. The plant-eating animals would start growing really fast.
B. The sea animals it eats would become fewer.
Students want to make a model that shows how a beach can change during a hurricane. Which materials would be best for the students to include in their model?
A. ice and rocks
B. water and sand
C. magnets and iron filling
D. baking soda and vinegar
B. water and sand
A student uses binoculars to look at birds far away. Then the student uses a phone to video chat with a friend. The student is using two tools to observe and share information. What do these tools help the student do?
A. See far and send sound
B. Record heat and save light
C. Zoom in and reflect images
D. Hear better and store sound
A. See far and send sound
A pencil, a softball, a piece of paper, and a book are dropped from the same height at the same time. Air resistance will cause which object to fall most slowly?
A. book
B. piece of paper
C. pencil
D. softball
B. piece of paper
How do light waves allow humans to see different colors?
A. Light waves stop moving when they hit an object, making the object disappear.
B. Light waves change direction when they touch objects, forcing humans to see new colors.
C. Light waves slow down and get stuck inside objects, which allows humans to see the object's true color.
D. Light waves bounce off objects and enter the human eye, which allows humans to see the color that is reflected.
D. Light waves bounce off objects and enter the human eye, which allows humans to see the color that is reflected.
Kudzu is a vine that grows in Tennessee. Kudzu is not native to Tennessee. The vine has caused problems for the ecosystem. Scientists want to decrease the kudzu population. They also want to improve the health of the ecosystem. Which of these should scientists do to get rid of kudzu and improve the health of the ecosystem?
A. Pour concrete on the land that has kudzu
B. Dig up all the land covered with kudzu.
C. Bring animals that eat kudzu to the land where it grows.
D. Spray poison on the land where kudzu grows.
C. Bring animals that eat kudzu to the land where it grows.
Which of the following is a pattern that may take many years to observe?
A. the sun rising in the East and setting in the West
B. a weather front bringing a cold winter storm
C. a caterpillar turning into a butterfly
D. erosion changing landforms on the Earth's surface
D. erosion changing landforms on the Earth's surface
Which of the following best explains how a person in Tennessee is able to communicate with a person in New York using cell phones?
A. The cell phones use soundwaves to transmit signals to each other.
B. The cell phones use electric currents to transmit signals to one another.
C. The cell phones use radio waves to transmit signals through a network of towers.
D. The cell phones use satellite communication to transmit signals to one another.
C. The cell phones use radio waves to transmit signals through a network of towers.
Choose two situations where potential energy is directly turned into kinetic energy.
A. a river flowing uphill
B. a block of ice melting in the sun
C. a person pushing a cart up a slope
D. a compressed spring launching a toy
E. a stretched rubber band being released
D. a compressed spring launching a toy
E. a stretched rubber band being released
Which two factors determine the color of an object we see?
A. the object's temperature
B. the size and shape of the object
C. the colors around the object being observed
D. the color of the wavelengths the object reflects
E. the color of the light source shining on the object
D. the color of the wavelengths the object reflects
E. the color of the light source shining on the object
What are two things that help keep a food web stable?
A. few interactions between organisms
B. an overpopulation of one kind of animal or plant
C. effective energy transfer and nutrients being reused
D. a balanced population of producers, consumers, and decomposers
E. having the most energy at the top of web where the big animals are
C. effective energy transfer and nutrients being reused
D. a balanced population of producers, consumers, and decomposers
The flow of river water results in the formation of various landforms. Which two landforms are formed by the erosional activities of river water?
A. delta
B. flood-plains
C. plateaus
D. river-valley
E. waterfalls
D. river-valley
E. waterfalls
What are two ways that GPS (Global Positioning System) application on a smartphone aids people in finding their way to a specific place?
A. by displaying real-time locations
B. by receiving radio waves from satellites
C. by mailing printed maps to their home address
D. by connecting to a library database for map resources
E. by calling a friend who lives nearby and asking for directions
A. by displaying real-time locations
B. by receiving radio waves from satellites