4th Quarter Questionaires (grs).docx

.1. A sepak takraw ball is hit vertically downward by a player. What is its acceleration after 1 second? a. 9.8 m/s b. 9.8 m/s 2

c. 1 m/s2 d. -9.8 m/s 2

2. The scientific rule that states that energy cannot be created or destroyed is called the Law of __________. a. Conservation of Momentum b. Potential

c. Conservation of Energy d. Kinetic

3. Compressed springs and stretched rubber bands are examples of this energy. a. Sound Energy b. Heat Energy

c. Elastic Potential Energy d. Gravitational Potential energy

4. Is any object that has been launched, dropped or thrown in a particular direction from one point. a. Momentum b. Trajectory

c. Impulse d. Projectile

5. Mass is expressed using this units. a. Kilograms (kg) b. Grams (g)

c. Seconds (s) d. Meter per Second (m/s)

6. Which of the following objects have the LEAST momentum? a. A large car going super fast. b. A tiny car going extremely slow.

c. A tiny car going super fast. d. A large car going extremely slow.

7. A ball was hitting by a bat. The impact force is 250 N, and the contact time is 0.2s. What is the impulse received by the ball? a. 25.2 N b. 1250 N

c. 125 N d. 50 N

8. How much momentum does a 25000g mass moving at 25 m/s have? a. 625 kg.m/s b. 625 kg.m/s 2

c. 625000 kg.m/s d. 625000 kg.m/s2

9. What is the velocity of a 5500g object that has a momentum of 550 kg.m/s? a. 100 m/s 2 b. 100 m/s

c. 100m d. 100s

10. The impulse experienced by a body is equal to the change in its _____________. a. Velocity

c. Kinetic Energy

b. Momentum

d. Potential Energy

11.It is called the two dimensional path that a projectile follow. a. horizontal and vertical path b. Trajectory

c. Positive and Negative path d. Projectory

12. A change in the position of the object is ____________. a. Speed b. Constant Speed

c. Average Speed d. Motion

13. It refers to the rate of motion. a. Speed b. Constant Speed

c. Average Speed d. Motion

14. A 1000kg car travelling South at 20.0 m/s collides with a 1200kg car travelling East at 20 m/s. The two vehicles entangle after the collision and head off as one. What is the velocity of the combined wreckage immediately after the collision? a. 20 m/s 2 b. 0.05 m/s

c. 20 m/s d. 20 kg.m/s

15. The Second Law of Motion states that the net force of an object is equal to the product of its mass and velocity. a. True

c. Partially True

b. False

d. None of the above.

16. What is the energy of a bicycle moving slowly at the top of a hill? a. entirely kinetic

c. entirely gravitational

b. entirely potential

d. both kinetic and potential

17. Which event is explained in the sequence of energy changes shown in the diagram below? Chemical Energy

Heat

Mechanical Energy

a. a turbine spins

c. electric current powers a flat iron

b. gasoline burns to run a jeepney

d. a headlight is on

18. Which event illustrates the direct transformation of potential to kinetic energy? a. A cow moves from rest.

c. Lala’s arrow is released from its bow.

b. A volleyball player hitting a flying ball.

d. A pen spring being compressed.

19. Kinetic energy is not conserved in these collision but momentum is still conserved. Which of the following is an example of these type of collision. a. A two figure skaters perform their own steps. b. The two vehicles with the same mass move away from each other after they collide. c. A cue ball in billiards. d. The two figure skaters move as one after they perform their own steps. 20. __________ is the capacity to do work. a. Energy

c. Force

b. Work done

d. Kinetic Energy

21. The one who postulated conservation of momentum. a. Rene Descartes

c. Renee Descartes

b. Gottfried Wilhelm Von Leibniz

d. Gottfried Wilhem Leibniz

22. A toy car is pulled along by a piece of string which is at 30° to the horizontal. Calculate the work done in pulling the toy if the tension in the string is 10 N, and it is pulled along 5 m. a. 43.3 J

c. 1.67 N

b. 1500J

d. 25√3 N