1441_PRACTICE

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PHYS 1441 Lab—Practice Exam (Not for a grade) Name:____________ ID:_______________ These questions are designed to test what you have learned throughout the semester in lab. Regrettably, most of the stock questions are designed for those who had in-person labs, so many of these questions have been made up, or taken from textbooks. Not to worry; the practice exam will be harder than the actual exam, so if you do well on it, you’ll be just fine for the real thing. Each topic will be given the same weight here as it will on the actual exam. For your convenience, the topics have been labeled here, but will not be labeled on the actual exam, so keep that in mind! Multiple choice—20 questions, 3 points each. Half conceptual, half analytical. 1. (Kinematics) An object moves about the x-axis. At t = 0 , the object is moving with a velocity of 3.7 meters per second. If the object accelerates backwards at -0.50 meters per second squared, find the average velocity from t = 3 to t = 4 . a. 1.4 m/s b. 1.6 m/s c. 1.8 m/s d. 2.0 m/s 2. (Newton’s first law) An object is subject to some forces. If you are free to orient the forces an any desired direction, which of the following sets makes it impossible for the object to have a zero acceleration? a. (83 N, 146 N, 208 N) b. (6 N, 12 N, 16 N, 22 N, 62 N) c. (150 lb, 83 lb, 231 lb)

d. (4 lb, 8 lb, 17 lb, 25 lb, 42 lb) 3. (Newton’s first law) A box is moving down a (very long) ramp at a constant velocity of 476,742.6872 m/s. The ramp is inclined at a 45-degree angle, and the mass of the box is 2 kg. Assuming the system is on Earth, what is the magnitude of Friction force exerted on the box? a. 14 Newtons b. 16 Newtons c. 18 Newtons d. 20 Newtons 4. (Newton’s second law) A group of students were performing the Newton’s 2nd Law experiment, in which the weight, W 2 , was the applied force acting on a cart with acceleration a . They graphed their measurements for the applied force on the cart vs. the acceleration of the cart and obtained a line of best fit, represented by W 2 = F f + ma. What physical quantity would the slope of the line in this graph represent? a. Initial velocity b. Force of friction c. Acceleration of the cart d. Total mass of the system 5. (Newton’s second law) A group of students performed the Newton’s 2nd Law experiment, starting with 0.80 kg of additional mass placed on a cart of an unknown mass. A hanging mass of 0.05 kg was used to apply a force to accelerate the cart. By using the addition mass from the cart, they slowly increasing the hanging mass, thus keeping the total mass

constant, and they recorded an acceleration for each trial. They found that the slope of a plotted line for W 2 vs. a is 1.840 kg. Determine the mass of the cart. a. 0.8 kg b. 1.0 kg c. 1.2 kg d. 1.4 kg 6. (Newton’s second law) During the Newton’s 2nd Law experiment, data was gathered and plotted onto a W 2 vs. acceleration graph. From the resulting linear line, the following data points were obtained: ( 0 m s 2 , 0.27 N ) and (2. 86 m s 2 , 5.9 N ). Determine the slope of the line. a. 1.95 kg b. 1.97 kg c. 1.99 kg d. 2.01 kg 7. (Rotational Motion) If the centripetal force applied to an object is slowly increased, the period of a complete cycle is expected to…? a. Increase b. Decrease c. Remain the same d. Clifton’s a nerd 8. (Rotational Motion) A massive Chevy Suburban and a less- massive Dodge Neon are following each other. They both take a curve at the same speed. The centripetal acceleration experience by the Suburban is __________ that of the Neon. a. Less than

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b. Greater than c. Equal to d. Pick this one if you want to lose 3 points! 9. (Rotational Motion) An object with 0.398 kg mass is spun in a circle of constant radius of 0.142 m, and the speed is measured. The centripetal force applied to the object is increased, and the procedure is repeated for a number of trials. The expected slope of a line of the plotted data for v2 vs. force would be: a. 2.8 kg/m b. 0.06 kg*m c. 0.36 m/kg d. 18 (kg*m) -1 10. (Rotational Motion) An object is located 3.2 meters away from the center of a turntable. The turntable is rotating with an angular velocity of 30 degrees per second, and accelerating at 5 degrees per second squared. Find the total acceleration of the object . a. 0.92 m/s 2 b. 0.94 m/s 2 c. 0.96 m/s 2 d. 0.98 m/s 2 11. (Forces and Torque) Where would a single 50-gram mass need to be placed upon a balance table to create a net torque of zero if two 100-gram masses are at the positions (0, –3) and (5, 0)? a. (− 10 , 6 ) b. ( 6 , − 10 ) c. ( 5 , − 3 ) d. (− 3 , 5 )

12. (Collisions) A billiard ball moving at 5,000 meters per second collides elastically with a billiard ball of the same mass, which is initially at rest. Determine the final velocity of the first ball. a. -2000 m/s b. -1000 m/s c. 0 m/s d. 1000 m/s e. 2000 m/s 13. (Collisions) Two balls of clay, one with a mass of 72 kg and moving at 2 m/s, and the other with a mass of 18 kg and moving at -8 m/s collide inelastically. What is the total energy of the system after the collision? a. 144 Joules b. 0 Joules c. 576 Joules d. 720 Joules 14. (Collisions) In problem (13), what was the initial total energy of the system? a. 144 Joules b. 0 Joules c. 576 Joules d. 720 Joules 15. (Energy) A 12 kg object is initially moving at a speed of 2.7 meters per second. A force is applied to the object, and afterward, it moves with a speed of 5.6 meters per second. How much work did the force do on the box? a. 188 Joules b. 44 Joules c. 232 Joules d. 144 Joules

16. (Energy) A 3 kg box is pushed up a ramp inclined at 20 degrees for 4 meters. The coefficient of kinetic friction between the two surfaces is 0.3. How much energy is lost during the process? a. 32.6 Joules b. 32.8 Joules c. 33.0 Joules d. 33.2 Joules 17. (Energy) A steel ball is sitting on the top of a frictionless track, 6 meters above the ground. What is the velocity of the ball when it is at the bottom of the track? a. 10.8 m/s b. 117.6 m/s c. 58.8 m/s d. Cannot be determined without mass 18. (Simple Harmonic Motion) A weight on a frictionless spring has a mass that is one-third the spring constant. What is the angular frequency of the system? a. 1.73 rad/s b. 1.75 rad/s c. 1.77 rad/s d. 1.79 rad/s 19. (Simple Harmonic Motion) Which of the following systems will exhibit simple harmonic motion? a. A projectile

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b. The population of a strain of bacteria over several hours c. A Pendulum d. A box sliding down a ramp, with friction 20. (Simple Harmonic Motion) On a distant planet, a 1.7 kg mass is hung from a spring with a spring constant of k = ¿ 4.1 N/m. The spring extends 3.2 meters past its initial position. What is the acceleration due to gravity on the planet? a. 7.7 m/s b. 7.9 m/s c. 8.1 m/s d. 8.3 m/s Long problems—4 questions, 10 points each. 1. (Work and Energy) A skier weighing 90 kg starts from rest down a hill inclined at 17 degrees. He skis 100 meters down the hill and then coasts for 70 meters along level snow until he stops. a. Find the coefficient of kinetic friction between the skis and the snow. (5 points)

b. What velocity does the skier have at the bottom of the hill? (5 points) 2. (Energy and Kinematics) A steel ball is placed on a frictionless track, illustrated below:

a. What will be the velocity of the ball at point A? (4 points) b. How far away from the track will the ball land, assuming the ground is level? (6 points) 3. ( R o t a

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tional Motion) Answer the following based on the information below. (2 points each) a. What is the angular velocity at t = 0 ? b. What is the angular displacement of the platform at 5 seconds? c. What is the tangential velocity at 5 seconds? d. What is the tangential acceleration at 5 seconds? e. What is the total acceleration at 5 seconds? 4. (Collisions) 2 masses are moving in a system. m 1 = 2 kg and m 2 = 4 kg . At the time of collision, mass 1 is moving at 4.3 m/s at an angle of 215 degrees, while mass 2 is moving at 6.2 m/s at an angle of 50 degrees. a. Find the magnitude and direction of the total momentum of the system before the collision. (2 points)

b. Find the energy in the system before the collision. (2 points) c. If m 1 exits the collision moving at 4.3 m/s at an angle of 215 degrees, find the velocity (magnitude and direction) of the other mass. (3 points) d. Find the energy in the system after the collision. Was the collision legal? If so, was it elastic? Briefly explain. (3 points)

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