University of San Carlos

Assessment and Evaluation in Science/Mathematics EducationUniversity of San Carlos

5

Name: __________________________________ Yr. & Sec.: _______________Date: ____________ Score: __________

Topic: WORK: This chapter focuses on the scientific conception of work in contrast with its Laymans equivalence, and on its importance and relevance in our daily life. The learner shall demonstrate an understanding of work done by a constant force, work-energy theorem, kinetic energy, and gravitational potential energy, conservative vs. non-conservative forces, conservation of mechanical energy, power and work done by a variable force. Objective/s: Student will be able to: define work, power and energy; describe the relationship between work and power, work and kinetic energy, work and potential energy, gravitational potential energy and kinetic energy, work and energy, & power and work; distinguish conservative and non-conservative forces; distinguish whether work is or is not done in a particular situation.

I. Multiple Choice: Encircle the letter of the correct answer.

1. What is the capacity or ability to do work?a. energyb. forcec. powerd. pressure2. Which of the following is a situation where work is NOT done?a. A boy climbing up a treeb. A vendor pushing a cart of coconuts c. A girl lifting a basket of fruits from the tabled. A businessman carrying a briefcase to his office3. Two forces F1 and F2 are acting on a box as shown in the figure, causing this box to move across the surface. The force vectors are drawn into scale. Which of the following statements is TRUE?F2F1

a. F1 is equal to F2 so F1 does equal work as F2. b. F1 is equal to F2 but F1 does more work than F2. c. F1 is bigger than F2 but F1 does equal work as F2.d. F1 is bigger than F2 so F1 does more work than F2.4. Which of the following refers to power?I. Rate at which work is changingII. Rate at which energy is changing III. Rate at which momentum is changinga. I onlyb. II onlyc. I & IId. I, II, & III

(For questions 5 & 6): A suitcase is pulled along a horizontal surface by a force F exerted by the owner at an angle as shown in the figure. 5. In this case, which force does the negative work?a. Frictionb. Applied force c. Normal Force d. Force of the gravity 6. Which force/force component does the positive work?a. Frictionb. Weight of the suitcasec. Vertical component of the applied forced. Horizontal component of the applied force

7. When will the gravitational potential energy of an object change?I. When its mass is increased or decreasedII. When it is brought to other planets or heavenly bodiesIII. When it is lowered or lifted from a position relative to the grounda. I & IIb. II & IIIc. I & IIId. I, II, & III8. The force F is directed at an angle relative to the displacement s. In such a case, which of the following is/are TRUE?I. When is zero, the force does work.II. When is not zero, the force component parallel to the displacement does work.III. When is not zero, the force component perpendicular to the displacement does work.a. I onlyb. I & IIc. I & IIId. II & III 9. Car A has a mass of 1000 kg and a velocity of 100 km/hr. Car B has a mass of 500 kg and a velocity of 50 km/hr. Which of the following statements CORRECTLY describes the kinetic energy of car A and B?a. The kinetic energy of car B is 1/6 of that of car A. b. The kinetic energy of car B is 1/8 of that of car A.c. The kinetic energy of car B is 6 times as big as that of car A.d. The kinetic energy of car B is 8 times as big as that of car A.10. As the time required for a person to do work increases, his power output ___________.a. increasesb. decreases c. remains the samed. increases then decreases11. After a strenuous activity done by two persons namely Ann and Ben, a conclusion is made that Ann is more powerful than Ben. Which of the following statements are CORRECT? I. Ann can do more work than Ben can for the same time interval.II. Ann can do the same amount of work as Ben in a lesser time interval.III. Ann can do the same amount of work as Ben but for a longer time interval. a. I onlyb. I & IIc. I & IIId. II & III 12. What happens with the balls potential and kinetic energies as it is falling?a. Its kinetic energy increases but its potential energy decreases.b. Its kinetic energy decreases but its potential energy increases.c. Its kinetic energy increases but its potential energy remains the same. d. Its potential energy decreases but its kinetic energy remains the same.13. Two forces F1 & F2 are of equal magnitudes. They both act on an object which is initially at rest. As a consequence, the speed of the object increases. Which of the following is NOT possible? a. The work done by each force is positive. b. The work done by each force is negative. c. F1 does positive work and F2 does zero work. d. F1 does positive work and F2 does negative work. 14. Going up a set of stairs requires exerting a force against gravity to carry oneself to a particular height. If you climb upstairs then, you will exert _________________________________.a. no work at all b. less work when you walk than when you run c. more work when you walk than when you rund. equal amounts of work when you walk or when you run15. A 2-kg ball is dropped freely from rest in a height of 20m from the ground. Air-resistance is negligible. What are the magnitudes in Joules of the initial gravitational potential energy (GPEi) and initial kinetic energy (KEi) respectively? (use g=10m/s2 if applicable)a. GPEi = 400 J; KEi = 400 J b. GPEi = 400 J; KEi = zero Jc. GPEi = zero J; KEi = 400 J d. GPEi = zero J; KEi = zero J16. An apple had a potential energy of 50 Joules. Then, it falls from rest from the tree. The only force that acts on the apple as it falls is the gravitational force. What is its kinetic energy in Joules upon reaching the ground or just before the normal force by the ground acts on it? a. 50 Joulesb. less than 50 Joulesc. more than 50 Joulesd. cannot be determined17. Two identical vaults are to be loaded simultaneously on the back of a truck by sliding them up using two ramps. One ramp is steeper than the other ramp. The same amount of force is applied in both cases. If friction is negligible in both ramps, the work done of the applied force when the steeper ramp is used is _________ the work done of the applied force when the other ramp is used.a. equal to b. greater than c. less than d. every much greater than18. Two spheres of different masses are dropped simultaneously from a cliff. Air-resistance is negligible. When they are 10 meters from the ground, they have the same ____________________. a. accelerationb. potential energy c. kinetic energyd. both b & c

(For questions no. 19 & 20) For a satellite in circular orbit around the earth, the gravitational force provides the centripetal force. 19. At any point along the satellites orbit, what is the angle in degree/s between the gravitational force and the displacement of the satellite? a. Zero b. More than zero but less than 90c. 90d. More than 9020. Does the gravitational force do work?a. No, because the path of the satellite is not straight b. Yes, because both displacements and gravitational force have magnitudesc. No, because the direction of gravitational force is parallel to the direction of the displacementd. Yes, because the direction of gravitational force is perpendicular to the direction of the displacement

Item Analysis for the Physics Quiz on Work conducted in Cansojong National High School for their IV-Earth Class last August 14, 2014(Legend: Green items are retained or revised a little, orange items are revised or improved while red items are discarded)

Breakdown of ItemsRetained: 7 items (1,6,8,9,10,11,18)Revised: 5 items (3,4,5,13,15)Discarded: 8 items (2,7,12,14,16,17,19,20)

Mean:Index of Difficulty- 0.27Total No. of Items: 20Index of Discrimination- 0.26Total No. of Takers: 53Index of Effectiveness- (-0.09)Highest Score: 9Lowest Score: 2

Mariano L. Valiente Jr.MA ScEd Physics

TEST CONSTRUCTIONITEM ANALYSIS

RATING

Completeness-10Punctuality-09Quality of the Original Test Item-35Total-54