# Conceptual Questions: Forces and Newton s Laws

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1 Conceptual Questions: Forces and Newton s Laws 1. An object can have motion only if a net force acts on it. his statement is a. true b. false 2. And the reason for this (refer to previous question) is due to a. Newton s first law b. Newton s second law c. Newton s third law d. Newton s fourth law e. Murphy s law 3. Compared to having no protection, what effect do airbags have on the FORCE required to stop you in a collision? a. increase b. decrease c. have no effect 4. Compared to having no protection, what effect do airbags have on the IME required to stop you in a collision? a. increase b. decrease c. have no effect 5. Compared to having no protection, what effect do airbags have on the CHANGE IN VELOCIY required to stop you in a collision? a. increase b. decrease c. have no effect 6. At the BOOM of a moving Ferris wheel, the NE (centripetal) force on you is directed a. up b. down c. is zero 7. o operate effectively, the gas ejected from a rocket must push against the air behind the rocket, thus driving the rocket forward. a. true b. false 8. If you install tires on your car which are half as wide as your present tires, your stopping distance would be (compared to the case with the wide tires) about a. half b. twice c. same 9. his is true, because the NUMBER of atomic contacts with the road would a. increase b. decrease c. stay same 10. but the OAL AREA of all of these contacts would a. increase b. decrease c. stay same 11. If you made your car twice as heavy as it is now, stopping distance of you car will be (compared to the lighter car) about a. half b. twice c. same 1

3 23. You are standing on a scale in an elevator that is accelerating downward at a constant rate of 1.0m/s 2. Your mass is 100kg. You look at the scale to determine your weight, it reads a. 101N b. 880N c. 980N d. 1080N 24. Consider the following scenarios. I. A thrown object at its hi ghest point. II. A hanging mass attached to the top of a moving railroad car that makes a constant angle of 10 degrees with the vertical. III. A bucket that is lowered at a constant velocity. In which case(s) is the object in dynamic equilibrium? a. I, II, and III b. II and III c. I and III d. II e. III 25. A 100g mass is connected to a light string and suspended vertically. It is displaced through an angle and released. he diagrams below indicate the position of the mass at different times t? In which position is the tension in the string greatest? 90 o C A B a. A b. B c. C 26. As a car moves up a hill, there is a force of friction between the road and the tires rolling on the road. he maximum force of friction is equal to a. the weight of the car times the coefficient of kinetic friction. b. the normal force of the road times the coefficient of kinetic friction. c. the normal force of the road times the coefficient of static friction. d. Zero e. the weight of the car times the coefficient of static friction. 27. For objects moving at nominal speeds, the force of kinetic friction is always equal to N, where N is the normal force acting on an object. his statement is a. true b. false 3

4 28. An object of mass m rests on a horizontal surface. he coefficient of static and kinetic friction is s and k, respectively. he frictional force acting on the object. a. s mg b. k mg c A student plots a position vs. time graph for a system moving under a constant net force. What will the graph look like? a. Parabola b. Straight (not horizontal) line c. Horizontal line 30. Why do you land with your knees bent when you jump off a tall chair? a. o reduce your change in velocity of your body. b. o increase the interaction time on your bones. c. o increase the stopping force. 31. In which case shown below is the tension in the rope greater? Assume the pulley and string are massless. a. 1 b. 2 c. both are equal N 50N 70N Pull 32. A rope is tied to a tree. A student pulls on the rope. A second student decides to pull on the same side of the rope as the first student. If the second student pulls with the same force as the first student the tension in the rope a. halved b. same c. doubled 33. Suppose that the rope in the above problem is untied and the students pull with equal but opposite forces F. As a result, the tension in the rope is a. 0 b. F c. 2F d. 4F 50N 34. If your car goes around a curve too quickly, you seem to be pushed against the door because of a. inertia b. centrifugal force 4

5 c. friction d. centripetal force 35. Which of the following forces should not be included in a free-body diagram. a. friction b. gravity c. centripetal d. normal 36. A ball is thrown vertically upward with an initial velocity v o. Assume air drag is present. Which of the following is true about its motion? a. Its time of flight upwards is less than its time of flight downwards. b. Its time of flight upwards is greater than its time of flight downwards. c. It takes the same amount of time to go up as it does to come back down. 37. A car starts from rest and accelerates to the right. An inertial observer notices that the pair of dice hanging in the rearview mirror moves c. answer depends on the magnitude of the car s acceleration 38. Furthermore, an observer in the reference frame of the car notices that the hanging dice move c. answer depends on the magnitude of the car s acceleration 39. he force causing the motion of the hanging dice is caused by a. the force producing the car s acceleration. b. the tension in the string that supports the dice c. both a and b are correct d. none of the above 40. A block rests in the front end of a trailer. If the trailer accelerates to the right, the block hits the back end of the trailer in t seconds. An inertial observer notices that the block moves c. answer depends on the magnitude of the trailer s acceleration 41. he force that causes the motion of the block in the trailer a. the force producing the trailer s acceleration. b. friction c. both a and b are correct d. none of the above 5

6 42. he force of static friction is always equal to s N, where N is the normal force acting on an object. his statement is a. true b. false 43. A skydiver falls through the air. he terminal speed of the skydiver depends on a. his/her spatial orientation b. his/her mass c. the air density d. all of the above 44. A force of F pulls 100 railroad cars of mass m. he net force on the 4 th railroad car is a. 0 b. F c. 46F/100 d. 4F/100 e. F/ A mischievous student throws a rock through a school window. One can conclude that greater force of impact was on a. the window b. the rock c. same force on both d. can t tell with information given he following six figures show various situations where blocks of the same mass m are supported by ropes either with pulleys or fixed objects. We are interested in the rope that is labeled in each figure. 30 o

7 46. In which figure or figures is the tension the greatest? 47. In which figure or figures is the tension the least? 48. In which figure or figures is the tension =mg? 49. Which rope in figure 1 has the greatest tension? a. the one labeled b. the one below the rope labeled. 50. A carpenter s level is shown in the diagram. If the level is pushed to the left, the bubble will move to the Bubble Carpenter s level c. answer depends on the magnitude of the car s acceleration 7

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