GRADE-9-SCIENCE.pptx summative test science

summative test for science 9

1. GRADE 9 - SCIENCE SUMMATIVE TEST S.Y. 2023-2024

2. DIRECTIONS: Choose the correct answer from the choices given below each item. Write the letter of your choice in your paper. (USE CAPITAL LETTER ONLY, AVOID ERASURES )

3. The initial velocity of Manuel playing luksong tinik has a horizontal and vertical component that are equal in magnitude. What angle does his velocity make with the horizontal? 30 B. 45 C. 60 D. 90

4. 2. If a stone is horizontally launched at a certain height, how do you describe the magnitude of its vertical velocity as it approaches the ground? A. Changes continuously C. Gradually increasing B. Gradually decreasing D. Remains the same

5. 3. If you throw a baseball straight up, what is its vertical velocity at the highest point? A.0m/s B.9.8m/s C. 0m/s2 D. -9.8 m/s2.

6. 4. A particle moves in a plane with constant acceleration in a direction from the initial velocity. The path of the particle will be ____________. a parabola B. an ellipse C. a straight-line D. an arc of a circle

7. 5. A projectile is launched at an angle of 300 above the horizontal. Neglecting air resistance, what are the projectile’s horizontal and vertical accelerations when it reaches its maximum height? Both the horizontal and vertical accelerations are zero. The horizontal acceleration is zero and the vertical acceleration is -9.81 m/s2. The horizontal acceleration is 9.81 m/s2 and the vertical acceleration is zero. Both the horizontal and vertical accelerations are 9.81 m/s2.

8. 6 . Consider an object with a constant mass, but whose momentum is changing which of the following is true about the object? The object is accelerating C. The object is moving with constant velocity The object is at rest D. None of the above

9. 7. How do Impulse and Momentum relate? Change in impulse is equal to the change in momentum. Change in impulse is greater than the change in momentum. Change in impulse is lesser than the change in momentum. Change in impulse depends upon the change in momentum.

10. 8. How do airbags and seatbelts affect the impact of force applied to a car accident? The greater the impact time, the greater the impact of force The impact time is longer, thus resulting in a lesser impact of force. The impact time is shorter, thus resulting in a greater impact of force. The smaller the impact time, the lesser the impact force

11. 9. It is one in which the total kinetic energy of the system does not change, and colliding objects bounce- off after collision Impulse C. Momentum C. Elastic Collision D. Inelastic Collision

12. 10. Two billiard balls approach each other with the same speed and collide in a perfectly elastic collision, what would be their velocities after collision? A. Zero B. Same in magnitude and direction. C. Same in magnitude but opposite in direction D. Different in magnitude and opposite in direction

13. 11. Which event does NOT describe potential energy being changed into kinetic energy? A _______ box sliding down a ramp. mango falling from a crate. pen spring being compressed. stretched rubber band got loosened.

14. Which of the following happens to a coconut that falls freely? Loses potential energy and gains kinetic energy Loses both potential energy and kinetic energy Gains potential energy and loses kinetic energy Gains both potential energy and kinetic energy

15. 13. A picture frame falls off the wall. Considering the presence of air, how does the kinetic energy (KE) just before striking the floor compare to the potential energy (PE) at its hanging point? KE is equal to PE. C. KE is greater than PE. KE is less than PE D. It is impossible to tell.

16. _ 14. What is the energy transformation that occurs in a ceiling fan? Electrical to chemical C. Mechanical to electrical B. Electrical to mechanical D. Mechanical to thermal

17. 15. Which event illustrates the direct transformation of potential energy to kinetic energy? A basketball player catches a flying ball. A kalesa moves from rest. Kathy’s arrow is released from its bow, The spring mechanism of a toy is rotated until it locked.

18. _ 16. A baseball player throws a ball horizontally. Which statement best describes the ball's motion after it is thrown? [Neglect the effect of friction.] Its vertical speed remains the same, and its horizontal speed increases. Its vertical speed remains the same, and its horizontal speed remains the same. Its vertical speed increases, and its horizontal speed increases. Its vertical speed increases, and its horizontal speed remains the same.

19. 17. What is needed to transfer heat in an air conditioning unit? Potential Energy C. Kinetic Energy Mechanical Energy D. Thermal Energy

20. 18. What can you do to reverse the process of keeping the food fresh from spoilage? By reheating it often C. Putting it in a food storage box Keeping it in a refrigerator D. Adding more food preservatives

21. 19. The   diagram   below   shows   a   projectile   moving   with speed   v   at   the   top   of   its   trajectory. Which   vector   best   represents   the   acceleration   of   the projectile   in   the   position   shown? A B C D

22. 20. If an egg is dropped on concrete, it usually breaks. If an egg is dropped on grass, it may not break. What conclusion explains this result? Grass has less mass than concrete. The coefficient of friction of the grass on the egg is less than the coefficient of the concrete on the egg. Grass has a softer texture. The egg is in contact with the grass for longer, so it absorbs less force.

23. 21. The area under the curve on a Force versus time (F versus t) graph represents ______ Kinetic energy C. Momentum B. Work D. Impulse

24. 22. A 0.250 kg cart moving at 0.400 m/s has how much momentum? . 1 kg-m/s C.10 kg-m/s 1 kg-m/s D. 100 kg-m/s

25. 23. When the speed of an object is doubled, its momentum _______________. remains unchanged in accord with the conservation of momentum. doubles quadruples decreases

26. 24. Softer landings tend to increase ______________. impact force C. collision time B. force D. change in momentum

27. 25. The difference between a car hitting a wall vs. a car hitting a haystack is the_________________. Impulse on the car hitting the wall is greater. change in momentum of the car hitting the wall is greater. force on the car hitting the haystack is greater. collision time of the car hitting the haystack is greater.

28. 26. When a car burns gasoline, it creates hot air to move the pistons in the engine, which causes the car to move. What energy transformation occur from the fuel to the movement of a car? thermal energy to mechanical energy thermal energy to chemical energy to mechanical energy chemical energy to thermal energy to mechanical energy chemical energy to electrical energy

29. 27. Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly? Chemical to light C. Electrical to chemical Electrical to light D. Chemical to electrical

30. 28. Which graph BEST shows the relationship of kinetic energy to potential energy as a book sits on the edge of a desk?

31. Figure 1 (Use this figure to answer questions 29,30, and 31. Assume that the height at point A and point C are the same) 29. In the figure, kinetic energy is being converted into potential energy from point A to point B. point B to point C. The only energy involved here is kinetic energy. Energy is not being converted. 30. In the figure, potential energy is being converted into kinetic energy from point A to point B. point B to Point C. The only energy involved here is potential energy. Energy is not being converted.

32. 31. As the car moves from point A, to point B, and finally to point C, the total energy of the car decreases from point A to point B, then increases from point B to point C. increases from point A to point B, then decreases from point B to point C. stays the same but is converted between potential and kinetic energy. is lost between points B and C.

33. 32. When does a yo-yo have the most potential energy? A. When it is at its lowest point B. When it is at its highest point C. When it's going between the highest and lowest points.  D. When it is moving at top speed  

34. 33. When is potential energy transformed into kinetic energy? When an object is ______________. at rest is lifted to a higher elevation C. at rest remains at rest in motion is stopped and put at rest. D. at rest is put into motion

35. 34. Why do objects at high elevations have more potential energy than objects at low elevations? Because ___________________________. the thinner air at higher elevations means objects have a greater potential to move very fast. objects at high elevations are closer to the sun, which is the source of all energy on earth. objects at high elevations tend to move slower than objects at low elevations. gravity gives objects at high elevations the potential to fall much further.

36. 35. According to the picture, how would the gravitational potential energy of the car change if its weight was doubled? The gravitational potential energy would __________________. be cut in half. C. would stay the same. be doubled. D. be increased by 750.

37. 36. A ball is projected into the air. Describe the change(s) in potential and kinetic energy. Potential energy decreases and kinetic energy increases. Kinetic energy increases and potential energy decreases. Potential energy decreases while kinetic energy increases; then kinetic energy decreases and potential energy increases. Kinetic energy decreases as potential energy increases; once at the top, potential energy decreases as kinetic energy increases.

38. 37. This flashlight uses three different forms of energy. Which of these shows the energy changes in the correct order? Mechanical → thermal → chemical Thermal → chemical → light Chemical → electrical → light Electrical → mechanical → chemical

39. 38. How would you increase the Kinetic Energy of an object? Decrease the speed C. Increase the height Decrease the mass D. Increase the speed

40. 39. Imagine an object held at some height above the ground. It is released and falls toward the ground. Ignoring air resistance or friction, which of the following must be true? Before it falls, all its energy must be potential energy. Before it falls, all its energy must be potential energy. At the end of its fall, all its energy must be converted to kinetic energy. During its fall, the combination of its kinetic and potential energy must equal the amount of potential energy with which it started. All the above.

41. 40. We dropped a golf ball from 100 cm in class. It bounced back to 60cm. Why did it not return to the 100 cm mark? Energy was ________________. lost while it fell. C. added to it when it hit the ground. transferred when it hit the ground. D. lost while it rose back up.