Slide 1

SURVIVORSCIENCE8th Grade Review

What will happen to sound waves traveling through the air when they reach water?A. they will speed upB. they will slow downC. they will not changeD. they will stopHow do humans sense energy differently than wild animals like a wolf or deer?A. some human senses are more highly developed, some are less.B. humans sense the environment the same way that wild animals do. C. wolves and deer have different senses than humans do. D. humans are the only creatures that can sense the environment.Where along the roller coaster track does the rider have the greatest amount of kinetic energy?A.position 1B.position 2C. position 3D.position 41234Which planet has the strongest gravitational force according to the data given?A. EarthB. MarsC. JupiterD. PlutoPlanetMass of a golf ball on that planet

Weight of a golf ballon that planetEarth0.045 kg.441 NMars0.045 kg.169 NJupiter0.045 kg1.12 NPluto0.045 kg.026 NWhen does the mass of an object change?A. When matter is taken away or addedB. When gravity on the object changesC. When it undergoes a physical changeD. When friction acts on the object.Which measurement do scientists use to most accurately describe the amount of matter in an object?A. DensityB. WeightC. MassD. VolumeIf the box has a mass of 20 N, how much force will be required to lift it with this lever?A. 5B. 10C. 20D. 50

After conducting several experiments, Isaac Newton concluded that light is a combination of different wavelengths. Which evidence supports his conclusion?A. light is white.B. light is found all over the universe.C. light separates into colors in a prism.D. light can travel very rapidly through space..Why does the spoon in the glass of water look like it is bent?A. light creates shadows that confuse the eyeB. light travels at different speeds through water and air C. water is reflecting the image of the spoon in airD. water cannot carry light waves, only reflect it.Which of the following objects has the greatest amount of gravitational force acting on Earth?A. A kick ballB. A bowling ballC. An 8th grade studentA car

Which planet has the least mass according to the data given?A. EarthB. MarsC. JupiterD. PlutoPlanetMass of a golf ball on that planet

Weight of a golf ballon that planetEarth0.045 kg.441 NMars0.045 kg.169 NJupiter0.045 kg1.12 NPluto0.045 kg.026 NAs a basketball bounces, the height of each bounce is lower than the previous bounce. How can this be explained?A. by the amount of air pressure in the basketballB. by the type of material the ball is made fromC. by friction acting on the ballD. by the hardness of the flooring materialAs the distance from an object increases, the amount of gravitational force felt by the objectA. increasesB. decreasesC. stays the sameD. disappearsWhat is the mechanical advantage of this lever?A. .5B. 1C. 2D. 50

How does understanding gravity help a chair designer?A. the chair must be attractive enough for people to want to buy it. B. the chair must be strong enough to hold peoples weight.C. the chair must be made out of materials that are easy to find.D. the chair must be the same shape as other types of chairs.How does a lever allow a weight to be lifted that is too heavy to be lifted without a lever?A. It contains energy to do the lifting and reduce the distance traveled.B. It reduces the weight of the object making it easier to lift.C. It reduces the force needed but increases the distance it is applied.D. It reduces the mass of the object and decreases the distance.Which of the following describes the mathematical relationship between the length of the arms on a lever?A. the longer the effort arm, the less the force needed to lift a massB. the longer the effort arm, the greater the force needed to lift a massC. the longer the resistance arm, the less the force needed to lift a massD. the shorter the resistance arm, the greater the force needed to lift a mass.Which of the following is an example of friction being reduced?A. brakes on a car slowing it downB. rubbing your hands together rapidlyC. tires of a car screeching on pavementD. adding oil to a moving machine partWhich is an example of a device that uses levers to create a mechanical advantage?A. electricity passing through a wire.B. a car moving on wheelsC. a bottle holding waterD. a screwdriver opening a can of paint.You can estimate how far away a lightning bolt strikes by counting the seconds between seeing the lightning and hearing the thunder. Why does this work?A. sound waves travel more slowly through air than light waves.B. sound waves travel slowly through the ear canal before they can be heard.C. sound waves cannot travel through empty space, they need a medium.D. sound waves spread out from a source in circles and light does not.How are sound and light waves different?A. Sound has wavelengths, light does notB. Sound can be measured, light cannotC. Light travels through space, sound cannotD. Light travels more slowly than soundAn experiment in the 1700s tried to measure the speed of light with a clock by timing how long it took light to travel from one lighthouse to another. The experiment failed. The speed of light was eventually measured when astronomers measured the time it took light to travel from a planet to Earth. How did technology limit the first experiment?A. light cannot be measured as it travels through Earths atmosphere.B. light travels too fast for a clock to measure in short distances. C. a clock will slow down when traveling at the speed of light.D. a clock cannot be used unless Earths rotation is calculated.How is the mechanical advantage of a lever determined?A. by subtracting the effort arm length from the resistance armB. by adding the effort arm and the resistance arm lengthC. by multiplying the effort arm times the resistance armD. by dividing the length of the effort arm by the resistance armWhich of the following is a way science has affected the ability of people to sense sound?A. made telescopes possibleB. designed glassesC. invented magnetic image sensingD. developed hearing aids Which of the following characteristics of a spaceship would change if it traveled to the moon?A. DensityB. WeightC. MassD. VolumeHow do plants respond to light?A. they do not respond to lightB. their roots move the plant away from the lightC. their leaves grow toward a light source D. they store kinetic energy from the light.Which is a way people try to increase the friction on a car?A. add motor oilB. add gasolineC. buy new tiresclean the windowsWhat produces motion for in an object?A. balanced forcesB. unbalanced forcesC. moving forcesD. frictional forcesAt which point along the ride would there be the most potential energy?A.position 1B.position 2C. position 3D.position 41234Which of the following best summarizes the relationships between energy, forces and motion?A. energy creates a force that may cause motionB. energy creates a force that always causes motionC. forces create energy which may cause motionD. forces create energy which always causes motion.What type of energy is stored in a stretched elastic cord?A.nuclear B.potential C. kinetic D.chemical What is another example of the process at A?A. hot air rising to take a balloon into the skyB. burning yourself on a hot stove burner.C. sitting out in the sun and getting a sunburnD. using electricity to turn a computer on

What do scientists call the "energy of motion?A.motorized energyB.potential energyC. chemical energyD.kinetic energyWhich of the following is an example of light energy being changed to chemical energy?A. a solar panel that charges a batteryB. a flashlight with rechargeable batteriesC. a switch that flips up to turn on a lightD. food that is eaten to provide mechanical energyWhat type of energy conversion is taking place inside a flashlight when it is on?A.mechanical energy to light energyB.chemical energy to light energy C. chemical energy to mechanical energyD.electromagnetic energy to chemical energyWhat is the relationship between the speed of sound and the density of the substance it travels through?A. Sound travels the fastest in gas mediumsB. The less dense the medium, the faster it travelsC. The density of the medium does not affect the speed of soundD. The more dense the medium, the faster it travelsWhich of the following uses gravity to do work?A. water behind a dam turns an electrical turbine.B. fossil fuels are burned to make electricity.C. people eat food and it allows them to do work.D. lightning strikes a tree and it catches fire.A snake comes out of its hole in the morning and warms itself on a rock. What has the snake responded to?A. the smells and sounds of morningB. the spinning of Earth on its axisC. moisture in the soilD. heat and light from the sunTHANK YOU EVERYONEGreat JobSURVIVORSCIENCE8th Grade Review