QUESTION 1 Newtons Laws describe why objects move. Conservation laws O a. describe how energyrmomentum is created 0 b. change over time O c. describe how energyr'momentum is destroyed Q d. restricts how objects move QUESTION 2 Which of the following scenarios violate conservation of energy? O a. when electrons go through a light bulb, the energy disappears O b. Kinetic energy goes into thermal energy as a skater travels down halfpipe with friction O c. a person pulls back a rubber band, doing work on the rubber band, increasing elastic potential energy, and then releases the rubber band, giving it kinetic energy 0 d. a waterfall transfers potential energy into kinetic energy QUESTION 3 A skater boarder is on a half pipe with friction. Where does the energy done by friction go? O a. into nuclear energy 0 b. no where, that energy is destroyed O c. back into the skater Q d. into the environment QUESTION 4 Which of the following is a true statement about the conservation of energy? O a. Total mechanical energy is conserved only if work is done on the system O b. Total mechanical energy is never conserved. O c. Total mechanical energy is conserved only if no work is done on the system Q d. Total mechanical energy is always conserved, no matter what the system does QUESTION 5 Which of the following parameters does not change the elastic energy on an object? O a. relaxed length 0 b. stretching distance O c. compression distance Q d. spring constant QUESTION 6 Which object has the highest kinetic energy? O a. All have the same Kinetic energy 0 b.A O c. C O (1.3 QUESTION 7 A popper that is inverted and released on the ground demonstrates which energy transfer? W O a. gravitational to elastic potential 0 b. elastic to gravitational potential 0 c. elastic potential only 0 d. kinetic to elastic potential QUESTION 8 Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour? 0 a. The large truck 0 b. Both have the same momentum. O c. The small truck QUESTION 9 Momentum conservation implies that during a collision with no outside forces 0 a. the momentum of each object before is equal to the momentum of each object after O b. the original direction of the collision will remain constant O c. the total momentum is destroyed after the collision G d. the total momentum of the system before the collision is equal to the total momentum of the system after QUESTION 1 0 A typical demonstration with Newtons Cradle is to pull back one of the spheres and watch it knock off one sphere on the other side. What would happen if four spheres were pulled pack? CIR. """"--- V O a. All six would kick out O b. Two would kick out 0 c. Only one would kick out 0 d. Four would kick out QUESTION 11 A collision is considered elastic if Q a. all of the above 0 b. there is no lasting deformation. 0 c. the objects that collide don't get warmer. Q d. the objects don't stick together. QUESTION 12 Which of the following scenarios conserve momentum? O a. two crates colliding against a rough surface O b. a rocket propelling into an asteroid O c. a tennis ball deforming while colliding with a tennis racket O d. A bowling ball colliding with a bowling pin QUESTION 13 A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small because the O a. energy on the cannon is less than the energy on the cannonball. O b. cannon has far more mass than the cannonball. O c. momentum of the cannon is unchanged O d. force against the cannon is relatively small. O e. none of the above QUESTION 14 Thor (a marvel superhero) is at rest in space when he throws an asteroid that has more mass than he does. Which moves faster, Thor or the asteroid? O a. They both move at the same speed. O b. The asteroid O c. Thor QUESTION 15 When a glass rod is charged by friction by rubbing it with silk, it becomes positively charged. According to the scenario described, what must be true? O a. the silk remains neutral. O b. electrons are removed from the rod. O c. protons are added to the silk. O d. protons are removed from the silk.QUESTION 16 I 3 .2 n . In the diagram shown above. the circles represent small balls that have electric charges. Ball 1 has a negative charge, and ball 2 is repelled by ball 1. Next, you see that ball 2 repels ball 3 and that ball 3 attracts ball 4. What is the electric charge on ball 4? O a. Ball 4 has a positive charge. O b. Ball 4 may have either a positive or negative charge. O C. Bell 4 can be negative or neutral 0 d. Ball 4 can be positive or neutral O 2. Ball 4 has a negative charge. QUESTION 17 Conservation of charge means that O a. the total amount of charge in the universe is constant. 0 b. no experimenter has ever seen a single charge destroyed by itself. 0 c. electrons by themselves can be neither created nor destroyed. Q d. charge can be neither created nor destroyed. O e. all of the above QUESTION 18 Which one of these statements is true of a positively charged object? O a. Protons are the only charged particles present in a positively charged object. O b. There are more protons than electrons in a positively charged object. O c. Electrons are the only charged particles present in a positively charged object. Q d. The electrons and protons in a positively charged object have a positive charge. QUESTION 19 A negatively charged balloon will be attracted to a neutral wooden cabinet due to polarization. Which one of the following diagrams best depict why this occurs? QUESTION 20 Charge is described as quantized. What does this imply about charge? O a. Charge is always a small number 0 b. Charge was always present in matter O c. The charge of electrons and protons are a xed value. Q d. Electrons and protons can change their charge value QUESTION 21 Consider the two spheres below and their charge distribution. What must be true about the spheres? Assume they are far away and do not inuence each other in any way. 0 a. Both spheres are metal 0 b. Both spheres were charged by conduction O c. The left sphere is not polarized while the right sphere is polarized Q d. The left sphere is an insulator and the right sphere is a conductor O 2. Both spheres electrically neutral QUESTION 22 The reason a charged balloon will stick to a wall is that O a. the balloon becomes polarized during the charging process and the wall becomes charged O b.the wall becomes polarized which means its electrically neutral but has an apparent charge 0 c. the wall becomes polarized which means its charged 0 d. electrons transfer back and forth between the wall and the balloon. QUESTION 23 A person receives a shock from an unknown charge as depicted from the diagram below. What is the charge of the object before the person touched the sphere? O a. Can not be determined 0 b.Pcsitive O c. Neutral 0 d. Negative QUESTION 24 What is the process shown below? _ A B C A: A teacher holds a negatively charged metal bar by its insulating handle and touches it to a metal sphere {attached to an insulating stand}. 3: The teacher p111] c the metal bar away and the metal sphere acquires a charge. C: The excess negative charge spread!) unifonnly about the surface of the metal sphere. O a. Charging by friction O b. Charging by double sphere induction G) c. Polarization Q d. Charging by single sphere induction 0 e. Charging by conduction QUESTION 25 Two initially uncharged metal spheres are mounted on insulating stands and placed in contact with each other, as shown above. A student brings a positively charged insulating rod near sphere I. Sphere II is then removed, and nally the rod is moved away. What is the net charge on sphere I? O a. Either a positive or a negative charge, depending on the sizes of the spheres b. It is negatively charged. 0 c. It is positively charged. 0 d. No charge 0 e. Either a positive or a negative charge, depending on the amount of charge on the rod QUESTION 26 Determine the kind and quantity of charge of1.45x109 excess electrons. O + 2.32x10'10 0 O - 2.32x10'10 (3 O + 9.05x1027 0 O - 9.06x1027 0 QUESTION 27 How many electrons are on a balloon with a total charge of-15.9nC? O 1.590x10'a electrons O 9.938x1019 electrons O 2.544x10'18 electrons O 9.938x1010 electrons