7 th Grade Science Force, Motion, and Energy

1. 7th Grade Science Force, Motion, and Energy

2. #1 What is Geotropism Pressure exerted on a plant cell wall by water passing into the cell An outgrowth on the surface of a plant A: B: Downward growth of plants due to the force of gravity None of these C: D:

3. C. Downward growth of plants due to the force of gravity

4. #2 How do seedlings break through the soil to come up? Through the use of force to provide energy Through the use of energy to apply force A: B: Through the use of soil to create force None of these C: D:

5. B. Through the use of energy to apply force

6. #3 The pressure exerted on a plant cell wall by water passing into the cell Turgor Pressure Geotropism A: B: Emergence None of these C: D:

7. A. Turgor Pressure

8. #4 Why is the sun important to all living organisms on Earth? The sun provides the radiant energy needed by all living organisms to thrive Living things do not always need light to live. A: B: Light is needed for respiration None of these C: D:

9. B. The sun provides the radiant energy needed by all living things to survive and thrive

10. #5 Why do plants need light? Plants need light to produce their own food through photosynthesis Plants need light to produce carbon dioxide A: B: Plants don’t always need to light to survive None of these C: D:

11. A. Plants need light to produce their own food through photosynthesis

12. #6 What do plants do with the light They get from the sun? They use light to create carbon dioxide they store light in the plants vacuoles, but it is not used A: B: They use light for photosynthesis to produce their own food None of these C: D:

13. C. They use light for photosynthesis to produce their own food

14. #7 Trace the path of sunlight from Sun to deer. Sun – grass - deer Grass – sun - deer A: B: None of these Deer – grass - sun C: D:

15. Sun – deer – grass • (Sun provides energy for grass to grow. Deer gets energy from sun by eating the grass)

16. #8 What has happened when plants go limp after standing upright for a long time? The sun’s energy decreased the turgor pressure in the plant The turgor pressure became weaker due to the lack of water A: B: None of these Both C: D:

17. A. The turgor pressure became weaker due to lack of water

18. #9 • Students wanted to see if using a ramp would lessen the amount of work needed to load a box into a truck that is 1 meter off the ground. • It takes 150 N of force to lift the box without a ramp. • It takes 50 N of force to lift the box with a 3 meter ramp. • What is the independent variable? (Different in the two) The ramp The box A: B: Both None of these C: D:

19. A. The ramp

20. #10 • Students wanted to see if using a ramp would lessen the amount of work needed to load a box into a truck that is 1 meter off the ground. • It takes 150 N of force to lift the box without a ramp. • It takes 50 N of force to lift the box with a 3 meter ramp. • What is the dependent variable? (What is measured) The ramp Amount of force needed A: B: Both None of these C: D:

21. B. Amount of force needed

22. #11 • Students wanted to see if using a ramp would lessen the amount of work needed to load a box into a truck that is 1 meter off the ground. • It takes 150 N of force to lift the box without a ramp. • It takes 50 N of force to lift the box with a 3 meter ramp. • What is one constant factor? (The same in the two) The ramp The box A: B: Both None of these C: D:

23. B. The box

24. #12 • Students wanted to see if using a ramp would lessen the amount of work needed to load a box into a truck that is 1 meter off the ground. • It takes 150 N of force to lift the box without a ramp. • It takes 50 N of force to lift the box with a 3 meter ramp. • What is a qualitative observation in this situation? A box is being lifted The ramp is 3 meters long A: B: Both None of these C: D:

25. A. A box is being lifted

26. #13 • Students wanted to see if using a ramp would lessen the amount of work needed to load a box into a truck that is 1 meter off the ground. • It takes 150 N of force to lift the box without a ramp. • It takes 50 N of force to lift the box with a 3 meter ramp. • What is a quantitative observation in this situation? A ramp is being used The ramp is 3 meters long A: B: Both None of these C: D:

27. B. The ramp is 3 meters long

28. #14 • Students wanted to see if using a ramp would lessen the amount of work needed to load a box into a truck that is 1 meter off the ground. • It takes 150 N of force to lift the box without a ramp. • It takes 50 N of force to lift the box with a 3 meter ramp. • What is the amount of work required to move the box in both situations? (Work = Force x Distance) 150j 50j A: B: 300j None of these C: D:

29. A. 150j

30. #15 • Students wanted to see if using a ramp would lessen the amount of work needed to load a box into a truck that is 1 meter off the ground. • It takes 150 N of force to lift the box without a ramp. • It takes 50 N of force to lift the box with a 3 meter ramp. • Did the ramp cause the student to use less work? • (Work = Force x Distance) Yes W = 150 x 1 W= 50 x 3 Both used 150j of work No W = 150 x 1 W= 50 x 3 Both used 150j of work A: B: Both None of these C: D:

31. B. No W = 150 x 1 W= 50 x 3 Both used 150j of work

32. #16 The variable which is changed on purpose in an experiment is the __________________. dependent variable controlled factor 3 A: B: independent variable None of these C: D:

33. C. Independent variable

34. #17 The variable which is measured in an experiment is the __________________. dependent variable controlled factor 3 A: B: independent variable None of these C: D:

35. A. Dependent variable

36. #18 The factor which is remains the same in an experiment is the __________________. dependent variable controlled factor 3 A: B: independent variable None of these C: D:

37. B. Controlled factor

38. #19 The ball sitting at the top of the hill in this picture is an example of ______ ______. Potential energy Kinetic energy A: B: Thermal energy None of these C: D:

39. A. Potential energy

40. #20 The ball rolling down the hill in this picture is an example of ______ ______. Potential energy Kinetic energy A: B: Thermal energy None of these C: D:

41. B. Kinetic energy

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