Exam 1--PHYS 151--Chapter 1
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1 ame: Class: Date: Exam 1--PHYS 151--Chapter 1 True/False Indicate whether the statement is true or false. Select A for True and B for False. 1. The force is a measure of an object s inertia. 2. Newton s first law says that if an object is moving, it will slow down unless a force acts upon it. 3. The force due to static friction is usually less than that due to kinetic friction. 4. Muscles under tension exert the same amount force at either end. 5. Skeletal muscles control the large, external motion of the body. 6. Joints are the locations where two or more bones meet. Multiple Choice Identify the choice that best completes the statement or answers the question. 7. Newton s second law is called the law of. a. inertia b. acceleration c. force d. reaction 8. Newton s third law says: a. for a force, there is an equal and opposite force b. a force causes acceleration c. an object tends to stay in its state of motion unless acted upon by a force 9. Friction is a force that of motion of two objects as they slide or attempt to slide across each other. a. opposes the direction b. is in the same direction c. is perpendicular to the direction 10. Which of these scenarios has the most friction? a. car tires on ice b. car tires on wet asphalt c. car tires on dry asphalt 11. The force in your bicep muscle attached at your shoulder and forearm is called a force. a. frictional b. weight c. tension d. normal 12. Which of these is not a force given in chapter 1? a. friction b. driving c. normal d. tension e. weight 13. Torques are relevant in which of these types of motion: a. oscillatory motion b. translational motion c. forced motion d. rotational motion 1
2 ame: 14. How is a torque similar to a force? a. the torque and force are exactly the same b. the torque changes the rotational motion; the force changes the translational motion c. the torque acts only when the force is perpendicular to the moment arm d. the torque and force both have units of Newtons 15. Which of these is not a type of muscle? a. digestive b. smooth c. cardiac d. skeletal 16. Muscles are connected to the bones at, at least, two points. The point attached to the bone that moves is called what? a. origin b. torque point c. axis of rotation d. insertion point 17. The standard for the second is based on which of these: a. the rotation period of a black hole at the center of our Galaxy b. the time it takes for light to travel a certain distance c. a certain fraction of the solar day d. the frequency of the cesium atom 18. Irene is 2 meters tall. A building is 10 meters tall. How tall is the building in Irene s? a. 10 Irenes b. 2 Irenes c. 2.5 Irenes d. 20 Irenes e. 5 Irenes 19. Which of these is the standard of measurement for the unit length? a. the diamater of a particular silicon ball b. the distance that light travels in a particular amount of time c. the distance across a cesium atom d. the length of a bar in France 20. Consider this equation. What are the units of p? (g has units of seconds; f has units of meters) p = f g a. ms b. s/m c. s d. m/s 21. What is the unit for mass in the Systeme Internationale convention? a. grams b. pounds c. kilograms d. slugs 22. Which of these is not a function of bones? a. to act as a lever when moving the body b. to store minerals for the body c. support of the body d. protection of the body e. all of these are functions of bones 23. In synovial joints, covers the ends of the bones. a. muscles b. calcium deposits c. tendons d. cartilage 24. An isotonic contraction occurs when the muscle contracts and. a. the body part moves b. the body part remains stationary c. both a & b 25. An isometric contraction occurs when the tension in the muscle increases and. a. neither of these b. the muscle doesn t get shorter c. the muscle does get shorter 26. Which of these is a type of movement caused by the body s muscles a. gliding b. rotation c. angular movement d. all of these 2
3 ame: 27. You hold a 30 newton weight in your hand with your elbow bent at 90 degrees. Your bicep exerts a force to hold up the weight. Is this force... a. more than 30 N b. less than 30 N c. equal to 30 N 28. For a system to be in equilibrium, the clockwise torques must be the counterclockwise torques. a. less than b. it depends on the direction of rotation c. equal to d. greater than 29. The deltoid muscle, shown here, represents what class of levers? 31. The erector spinae muscles help us to do which of these? a. lift heavy objects b. stand up straight c. walk d. move our finger e. turn our head 32. The force due to the muscles (F m ) in this figure produce. a. 1 b. 2 c. 3 d The deltoid muscle must exert a very large force to lift the arm. Which of these is the best explanation for this? a. the deltoid is a very small muscle b. the torque of the deltoid is very small c. the lever arm for the muscle force is quite small d. the arm is very heavy a. a clockwise torque b. a counterclockwise torque c. no torque at all 33. Consider the figure for the previous problem. The force due to the muscles (F m ) in this figure must be the combined weight of the arms, trunk, head and neck (W arms +W thn ) for the man to be in equilibrium. a. larger than b. smaller than c. equal to 34. To balance properly when carrying a heavy box in front of you, you must. a. lean backwards b. lean forwards c. use your leg muscles d. turn your head back & forth 35. Your head has an approximate mass of 5kg. What is its weight? a. 50 N b. 0.5 N c. 500 N d. 5 pounds 3
4 ame: 36. Normal is a mathematical term that means. a. equidistant b. differentiated c. perpendicular d. opposite e. biased 37. Consider these levers. The block on each is the same mass. Which lever requires the most force, F, to hold the block up as shown? a. a b. b c. c 38. Consider these body parts. What type of lever are they (in order from left to right)? a. 3,2,1 b. 2,3,1 c. 1,2,3 d. 1,3,2 39. Label each of these levers as either first, second, or third class. 40. A hockey puck slides on ice. If no net force acts on the puck, what will happen? a. the puck will continue travelling at constant velocity b. the puck will speed up c. the puck will stop immediately d. the puck will slow down & eventually stop 41. How does the force of gravity on a stone (F g,s ) compare with the force of gravity on a feather (F g,f )? a. F g,s >F g,f b. F g,s =F g,f c. F g,s <F g,f 42. A block sits on the table. When you press down on the block, the frictional force between the block and table increases. Why? a. the gravitational force on the table has inverted b. the block changes shape and better conforms to the table c. the normal force on the block is greater d. the block is closer to the table 43. Two tug-of-war opponents each pull with a force of 100 N on opposite ends of a rope. What is the tension in the rope? a. 50 N b. 100 N c. 150 N d. 200 N e. 250 N 44. A tire rolls, without skidding, across asphalt. What is the type of friction between the tire and asphalt? a. static friction b. kinetic friction c. there is no friction 45. What happens to the normal force on the block (with mass m) as the angle of the inclined plane (θ) is increased? a. a:3; b:2; c:1 b. a:3; b:1; c:2 c. a:2; b:1; c:3 d. a:1; b:2; c:3 a. the normal force increases b. the normal force decreases c. the normal force stays the same d. the normal force is only dependent on the mass of the block 4
5 ID: A Exam 1--PHYS 151--Chapter 1 Answer Section TRUE/FALSE 1. ANS: F PTS: 1 2. ANS: F PTS: 1 3. ANS: F PTS: 1 4. ANS: T PTS: 1 5. ANS: T PTS: 1 6. ANS: T PTS: 1 MULTIPLE CHOICE 7. ANS: B PTS: 1 8. ANS: A PTS: 1 9. ANS: A PTS: ANS: C PTS: ANS: C PTS: ANS: B PTS: ANS: D PTS: ANS: B PTS: ANS: A PTS: ANS: D PTS: ANS: D PTS: ANS: E PTS: ANS: B PTS: ANS: D PTS: ANS: C PTS: ANS: E PTS: ANS: D PTS: ANS: A PTS: ANS: B PTS: ANS: D PTS: ANS: A PTS: ANS: C PTS: ANS: C PTS: ANS: C PTS: ANS: B PTS: ANS: A PTS: ANS: A PTS: ANS: A PTS: ANS: A PTS: ANS: C PTS: 1 1
6 ID: A 37. ANS: B PTS: ANS: D PTS: ANS: A PTS: ANS: A PTS: ANS: A PTS: ANS: C PTS: ANS: B PTS: ANS: A PTS: ANS: B PTS: 1 2
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