# A she should not expect the ball to travel in a

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(a) she should not expect the ball to travel in a straight line because she is not fixed to an inertial frame of reference. 4 (b) the balls travel on a circular trajectory because of the wind produced by the turning merry-go-round (she would not see this effect in vacuum). (c) there must be some external force acting to the right on the balls (d) the merry-go-around must not be leveled (she would not see this effect if it were leveled). (e) the batch of golf balls is defective being heavier on the right side than the left. Alice observes the ball from her reference frame, which is non-inertial due to the accel- eration of the rotation. Non-inertial reference frames require the existence of fictitious forces, such as the centrifugal or Coriolis force, to account for observed motion. In a top down view, the released ball continues along a straight line independent of Alice’s rotation. Other choices posit the existence of an external force, which is excluded by the fact the deflection is independent of the point in the rotation she releases the ball. 4

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4. The following is an incomplete free body diagram for an object traveling in a straight line with constant speed. The direction of travel is horizontally from left to right on the diagram. The arrow that best approximates the missing force in the incomplete free body diagram is (a) 4 (b) (c) (d) (e) Above is the force diagram of the object. The resultant force of the above pair is blue . Because the object is traveling with constant speed and without rotation, the acceleration is 0. The missing force then cancels the resultant force, drawn here in red . 5
5. Three identical blocks, each of mass m , are connected by strings as indicated in the figure: The strings have negligible mass and the (horizontal) table on which the blocks slide pro- duces negligible friction. The whole arrangement is being pulled from the right, as indicated

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