rcelenotherated.A baseball bat striking a ball is an example of an action-reaction pair. If thebat exerts a 50.-newton force on the baseball, the ball exerts a 50.-newtonforce on the bat in the opposite direction. Each member of the action/reaction pair of forces acts on a different object; one force acts on the balland the other on the bat. If no other forces are present, the objects areaccelerated in opposite directions as long as the forces are applied.RevieWestiQuestionsAs mossdecrease intertla55. As the mass of an object on Earth's surfacedecreases, what happens to the inertia andweight of the object?(1) Inertia decreases, and weight decreases.(2) Inertia decreases, and weight remainsKule something proves this59. A cart is uniformly accelerating from rest.The net force acting on the cart is(1) decreasing(2) zero(3) constant but not zero(4) increasing60. An 8.0-kilogram block and a 2.0-kilogram blockrest on a horizontal frictionless surface. Whenhorizontal force F is applied to the 8.0-kilogramblock, it accelerates at 5.0 meters per second?east. If the same force was applied to the2.0-kilogram block, the magnitude of the block'sacceleration would bethe same.(3) Inertia increases, and weight decreases.(4) Inertia remains the same, and weightremains the same.56. Compared to the inertia of a 0.10-kilogram steelball, the inertia of a 0.20-kilogram Styrofoamball is(1) one-half as great(2) twice as great(3) the same(4) four times as great(1) 1.3 m/s?(2) 2.5 m/s?(3) 10. m/s?(4) 20. m/s?61. A 6-newton force and an 8-newton force act57. A ball rolls through a hollow semicirculartube lying flat on a horizontal tabletop. Onthe following diagram, draw a line with anarrowhead to represent the path of the ballafter emerging from the tube, as viewedfrom above.concurrently on a box located on a frictionlesshorizontal surface. Which top-view diagramshows the forces producing the smallestmagnitude of acceleration of the box?8N6N Top of boxTop of box8 N6 N(1)(3)6NTop of box8NTabletopTop of box8 N6 N58. The following graph shows the relationshipbetween the acceleration of an object and thenet force on the object.(2)(4)Acceleration vs. Force62. As the vector sum of all the forces acting on amoving object increases, the magnitude of theacceleration of the object6.2. 2(1) decreases(3) remains the same(2) increases1 23 40.Force (N)63. An unbalanced force of 10.0 newtons northacts on a 20.0-kilogram mass for 5.0 seconds.Calculate the acceleration of the mass.What is the mass of the object?(1) 1 kg(2) 2 kg(3) 0.5 kg (4) 0.2 kgTopic 2: Mechanics 41Acceleration (m/s? an object that has no unbalanced force aangles to the horizon is a vertical component. If air resistance is neglected,67. Which graph best represents the motion of64 Two horizontal forces are applied to a2.0-kilogram block on a frictionless, horizontalsurface, as shown in the following diagram.on it?independent.is known, thegravitationalsuperpositionFi=2.0 NF2 = 8.0 N2.0 kgFrictionless horizontal surfaceTimeTime(1)A ProjectAn object pabove EartIf air resistof the velovertical vevelocity irdue to grastraight athat hasdownwa(3)The acceleration of the block is(1) 5.0 m/s to the right(2) 5.0 m/s to the left(3) 3.0 m/s to the right(4) 3.0 m/s to the leftTimeTime(2)65. Which graph best represents the motion of anobject on which the net force is zero?(4)68. Four forces act on an object, as shown in thefollowing diagram.30. NWhetherhorizonis the saTimeTime(1)TimeTime40. N(2)(3)(4)66. The vector diagram below represents force Facting on point P.seen by30. Nat 1.00-If the object is moving with a constant velocity,what is the magnitude of force F?examp10.0 maboveForceWhich vector diagram represents the pairof concurrent forces that would produceequilibrium when added to force F?69. A 1.0-kilogram book rests on a horizontaltabletop. The magnitude of the force of thetabletop on the book is(1) 1.0 kg (2) 9.8 kg (3) 1.0 N70. In the following diagram, an inflated balloonreleased from rest moves horizontally withvelocity v.time athe saIn ad(4) 9.8 Nan el2-12E(1)(2)andballhoridro(3)(4)AirBalloonincrWhat is the most likely cause of this velocity?thefallTwo-Dimensional Motion and TrajectoriesThe motion of an object traveling in a two-dimensional plane can bedescribed by separating its motion into the horizontal (x) and vertical (1)components of its displacement, velocity, and acceleration. A componentparallel to the horizon is a horizontal component and a component at rightWvediinan example of two-dimensional motion is the motion of a cannonballprojected near the surface of Earth at an angle above the horizontal, 16gravity is the only unbalanced force acting on the cannonball, the verticalcomponent of the ball's motion is identical to that of a freely falling boand the horizontal component is uniform motion. Although the twomotions occur simultaneously, the two components of the motion are2 Topic 2: Mechanics

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