1. While rolling on a rough surface, the momentum of a ball becomes half its original value. What can be predicted about the ball s velocity?
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1 o Not Reproduce NPI EO Physics Sample Items Goal 6 1. While rolling on a rough surface, the momentum of a ball becomes half its original value. What can be predicted about the ball s velocity? It becomes four times its original velocity. It becomes one fourth its original velocity. It becomes twice its original velocity. It becomes half its original velocity. Page 1
2 o Not Reproduce NPI EO Physics Sample Items Goal 6 2. The drawings below show four pairs of ice skaters skating at different velocities. In which of the following situations is the momentum equal for the two skaters? 10 m/s 10 m/s 40 kg 40 kg 20 m/s 10 m/s 40 kg 40 kg 20 m/s 15 m/s 45 kg 60 kg 20 m/s 15 m/s 45 kg 60 kg Page 2
3 o Not Reproduce NPI EO Physics Sample Items Goal 6 3. ball is thrown vertically upward and returns to the same position in 3.0 seconds. To what height does the ball rise? 44 m 15 m 11 m 9.8 m 6. 5-kg mass is initially traveling at 10 m/s. It accelerates at 2 m/s/s for 4 s. What is the impulse? 40 kg m/s 50 kg m/s 80 kg m/s 90 kg m/s 4. ball of mass 0.5 kg is acted upon by a force of 20 N for 2 s. What is the impulse imparted? 7. If a constant force is exerted on an object for 6.0 s causing a change in momentum of 24 kg m/s, what is the magnitude of the force? 10 N s 2.0 N 20 N s 4.0 N 40 N s 72 N 80 N s 140 N 5. If a force of 30. N acts on a 15-kg mass for 5.0 s, what is the magnitude of the change in momentum of the mass? 10. kg m/s 8. force acting in a straight line on a 3.0-kg mass increases the speed of the mass from 4.0 m/s to 6.0 m/s. What is the magnitude of the change in the momentum of the mass? 75 kg m/s 6.0 kg m/s 150 kg m/s 12 kg m/s 450 kg m/s 18 kg m/s 30. kg m/s Page 3
4 o Not Reproduce NPI EO Physics Sample Items Goal 6 9. Which of the following will produce the largest change in the momentum of a rocket? 50 N of thrust for 30 s 100 N of thrust for 10 s 500 N of thrust for 6 s 1,000 N of thrust for 2 s 10. n object of mass 5 kg experiences a force as shown in the graph Time (s) What is the change in velocity after 10 s? 2 m/s 4 m/s 10 m/s 20 m/s Page 4
5 o Not Reproduce NPI EO Physics Sample Items Goal kg soccer ball is rolling toward a player at 6.1 m/s. The player kicks the ball and it rolls in the opposite direction at 15 m/s. If the ball is in contact with the player s foot for 0.05 s, what average force did the player exert on the ball? 32 N 13. ar X and ar Y have identical masses. ar X is moving initially at 5.0 m/s in the direction shown. ar Y is initially at rest. ar X collides with ar Y and their bumpers lock. X 5.0 m/s Y 130 N 320 N What is the velocity of the two cars after the collision? 420 N 0 m/s 2.5 m/s 12. In which situation would there be the greatest change in momentum? a ball thrown at a wall that hits and sticks to the wall 5.0 m/s 10. m/s a ball thrown at a wall that hits and bounces off with half its original speed a ball that is thrown at the wall, but misses and keeps moving past the wall a ball thrown at a wall that hits and bounces off the wall with the same speed Page 5
6 o Not Reproduce NPI EO Physics Sample Items Goal Two steel balls are in a head-on, elastic collision. The 2-kg ball was traveling at 9 m/s to the right, and the 4-kg ball was traveling at 3 m/s to the left. fter the collision, the 2-kg ball is traveling back to the left at 7 m/s. What is the velocity of the 4-kg ball? 5 m/s to the right 6 m/s to the right 7 m/s to the right 9 m/s to the right 15. 1,500-kg car, moving at 20 m/s, collides with a 2,000-kg car stopped at a stoplight. fter the impact, both cars stick together. What is the approximate speed of the cars after the impact? 9 m/s 10 m/s 20 m/s 60 m/s Page 6
7 o Not Reproduce NPI EO Physics Sample Items Goal kg block of wood rests on a frozen pond kg lump of clay strikes the block and sticks to it. The block and clay then move together at 1.5 m/s. efore lock of Wood 5.0 kg lay Ice 0.20 kg fter lock of Wood 5.0 kg 0.20 kg lay Ice What was the velocity of the incoming clay? 7.5 m/s 15 m/s 39 m/s 75 m/s Page 7
8 o Not Reproduce NPI EO Physics Sample Items Goal car with a mass of 300. kg traveling with a velocity of 10.0 m/s is brought to rest in a collision with a brick wall. What is the change in momentum of the car? (ssume the original motion of the car is in a positive direction.) kg ball traveling at 15 m/s hits a stationary wall and rebounds back with a velocity of 15 m/s. What is the impulse imparted by the wall? 0 N s N s N s N s 1.5 N s 3.0 N s 4.5 N s N s End of Goal 6 Sample Items In compliance with federal law, including the provisions of Title IX of the Education mendments of 1972, the epartment of Public Instruction does not discriminate on the basis of race, sex, religion, color, national or ethnic origin, age, disability, or military service in its policies, programs, activities, admissions or employment. Page 8
9 Goal 6 nswers to EO Physics Sample Items 1. Objective 6.01 ssess the vector nature of momentum and its relation to the mass and velocity of an object. Thinking Skill: Generating orrect nswer: 2. Objective 6.01 ssess the vector nature of momentum and its relation to the mass and velocity of an object. Thinking Skill: nalyzing orrect nswer: 3. Objective 6.01 ssess the vector nature of momentum and its relation to the mass and velocity of an object. Thinking Skill: nalyzing orrect nswer: 4. Objective 6.02 ompare and contrast impulse and momentum. Thinking Skill: pplying orrect nswer: 5. Objective 6.02 ompare and contrast impulse and momentum. Thinking Skill: pplying orrect nswer: 6. Objective 6.02 ompare and contrast impulse and momentum. Thinking Skill: pplying orrect nswer: 7. Objective 6.03 nalyze the factors required to produce a change in momentum. Thinking Skill: pplying orrect nswer: 8. Objective 6.03 nalyze the factors required to produce a change in momentum. Thinking Skill: pplying orrect nswer: 9. Objective 6.03 nalyze the factors required to produce a change in momentum. Thinking Skill: pplying orrect nswer: North arolina Testing Program educational purposes only; not for personal or financial gain.
10 Goal 6 nswers to EO Physics Sample Items 10. Objective 6.03 nalyze the factors required to produce a change in momentum. Thinking Skill: Integrating orrect nswer: 11. Objective 6.03 nalyze the factors required to produce a change in momentum. Thinking Skill: pplying orrect nswer: 12. Objective 6.03 nalyze the factors required to produce a change in momentum. Thinking Skill: nalyzing orrect nswer: 13. Objective 6.04 nalyze interactions between objects and recognize the total momentum is conserved in both collision and recoil situations. Thinking Skill: pplying orrect nswer: 14. Objective 6.04 nalyze interactions between objects and recognize the total momentum is conserved in both collision and recoil situations. Thinking Skill: pplying orrect nswer: 15. Objective 6.04 nalyze interactions between objects and recognize the total momentum is conserved in both collision and recoil situations. Thinking Skill: pplying orrect nswer: 16. Objective 6.04 nalyze interactions between objects and recognize the total momentum is conserved in both collision and recoil situations. Thinking Skill: pplying orrect nswer: 17. Objective 6.05 ssess real world applications of the impulse and momentum including but not limited to sports and transportation. Thinking Skill: pplying orrect nswer: 18. Objective 6.05 ssess real world applications of the impulse and momentum including but not limited to sports and transportation. Thinking Skill: pplying orrect nswer: North arolina Testing Program educational purposes only; not for personal or financial gain.
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