2D Motion - cribME!

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Page 6 of 7CT2D-9. Consider the velocities at times t 1 and t 2 . These are the velocity vectors V 1 and V 2 .Draw the V 1 + V = V 2 vector diagram. What is the direction of V, the change in velocitybetween t 1 and t 2 ?A) straight up B) straight down C) upper right D) lower rightt 1t 2v oAnswer: straight down . The direction of V is the same as the direction of theacceleration a.CT2D-10. True or False: If the speed of an object is constant, its acceleration must be zero.A) True B) FalseAnswer: False. An object moving with constant speed around a circle has a non-zeroacceleration, because the direction of the velocity is changing.
Page 7 of 7CT2D-11. A particle is moving along the path shown, with constant speed. Its velocity vector attwo different times is shown. What is the direction of the acceleration when the particle is atpoint X?BXACAnswer: A. Draw the V1-V2-deltaV diagram!D(E) None of theseCT2D-12. A race car travels around the track shown at constant speed. Over which portion ofthe track is the magnitude of the acceleration the smallest?2431A) From 1 to 2 B) From 3 to 4 C) Neither of these D) Both of theseHint: it’s a trick question !Answer: Neither of these. The acceleration is zero on the straight portions of the track.
Page 3 and 4: Page 3 of 7CT2D-5. Two projectiles
Page 5: Page 5 of 7CT2D-7. A pellet is fire

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