SURVIVOR

1. 8th Grade Review SURVIVOR SCIENCE

2. What will happen to sound waves traveling through the air when they reach water? A. they will speed up B. they will slow down C. they will not change D. they will stop

3. How 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.

4. 1 4 2 3 Where along the roller coaster track does the rider have the greatest amount of kinetic energy? A. position 1 B. position 2 C. position 3 D. position 4

5. Which planet has the strongest gravitational force according to the data given? A. Earth B. Mars C. Jupiter D. Pluto

6. When does the mass of an object change? A. When matter is taken away or added B. When gravity on the object changes C. When it undergoes a physical change D. When friction acts on the object.

7. Which measurement do scientists use to most accurately describe the amount of matter in an object? A. Density B. Weight C. Mass D. Volume

8. If the box has a mass of 20 N, how much force will be required to lift it with this lever? A. 5 B. 10 C. 20 D. 50

9. 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..

10. Why does the spoon in the glass of water look like it is bent? A. light creates shadows that confuse the eye B. light travels at different speeds through water and air C. water is reflecting the image of the spoon in air D. water cannot carry light waves, only reflect it.

11. Which of the following objects has the greatest amount of gravitational force acting on Earth? A. A kick ball B. A bowling ball C. An 8th grade student • A car

12. Which planet has the least mass according to the data given? A. Earth B. Mars C. Jupiter D. Pluto

13. As 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 basketball B. by the type of material the ball is made from C. by friction acting on the ball D. by the hardness of the flooring material

14. As the distance from an object increases, the amount of gravitational force felt by the object A. increases B. decreases C. stays the same D. disappears

15. What is the mechanical advantage of this lever? A. .5 B. 1 C. 2 D. 50

16. 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 people’s 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.

17. 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.

18. 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 mass B. the longer the effort arm, the greater the force needed to lift a mass C. the longer the resistance arm, the less the force needed to lift a mass D. the shorter the resistance arm, the greater the force needed to lift a mass.

19. Which of the following is an example of friction being reduced? A. brakes on a car slowing it down B. rubbing your hands together rapidly C. tires of a car screeching on pavement D. adding oil to a moving machine part

20. Which 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 wheels C. a bottle holding water D. a screwdriver opening a can of paint.

21. 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.

22. How are sound and light waves different? A. Sound has wavelengths, light does not B. Sound can be measured, light cannot C. Light travels through space, sound cannot D. Light travels more slowly than sound

23. An experiment in the 1700’s 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 Earth’s 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 Earth’s rotation is calculated.

24. How is the mechanical advantage of a lever determined? A. by subtracting the effort arm length from the resistance arm B. by adding the effort arm and the resistance arm length C. by multiplying the effort arm times the resistance arm D. by dividing the length of the effort arm by the resistance arm

25. Which of the following is a way science has affected the ability of people to sense sound? A. made telescopes possible B. designed glasses C. invented magnetic image sensing D. developed hearing aids

26. Which of the following characteristics of a spaceship would change if it traveled to the moon? A. Density B. Weight C. Mass D. Volume

27. How do plants respond to light? A. they do not respond to light B. their roots move the plant away from the light C. their leaves grow toward a light source D. they store kinetic energy from the light.

28. Which is a way people try to increase the friction on a car? A. add motor oil B. add gasoline C. buy new tires • clean the windows

29. What produces motion for in an object? A. balanced forces B. unbalanced forces C. moving forces D. frictional forces

30. 1 4 2 3 At which point along the ride would there be the most potential energy? A. position 1 B. position 2 C. position 3 D. position 4

31. Which of the following best summarizes the relationships between energy, forces and motion? A. energy creates a force that may cause motion B. energy creates a force that always causes motion C. forces create energy which may cause motion D. forces create energy which always causes motion.

32. What type of energy is stored in a stretched elastic cord? A. nuclear B. potential C. kinetic D. chemical

33. What is another example of the process at “A”? A. hot air rising to take a balloon into the sky B. burning yourself on a hot stove burner. C. sitting out in the sun and getting a sunburn D. using electricity to turn a computer on

34. What do scientists call the "energy of motion?” A. motorized energy B. potential energy C. chemical energy D. kinetic energy

35. Which of the following is an example of light energy being changed to chemical energy? A. a solar panel that charges a battery B. a flashlight with rechargeable batteries C. a switch that flips up to turn on a light D. food that is eaten to provide mechanical energy

36. What type of energy conversion is taking place inside a flashlight when it is on? A. mechanical energy to light energy B. chemical energy to light energy C. chemical energy to mechanical energy D. electromagnetic energy to chemical energy

37. What is the relationship between the speed of sound and the density of the substance it travels through? A. Sound travels the fastest in gas mediums B. The less dense the medium, the faster it travels C. The density of the medium does not affect the speed of sound D. The more dense the medium, the faster it travels

38. Which 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.

39. 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 morning B. the spinning of Earth on its axis C. moisture in the soil D. heat and light from the sun

40. THANK YOU EVERYONEGreat Job 8th Grade Review SURVIVOR SCIENCE