Transcription
Chapter 8 QuickCheck QuestionsphysicsFOR SCIENTISTS AND ENGINEERSa strategic approachTHIRD EDITIONrandall d. knight 2013 Pearson Education, Inc.
QuickCheck 8.1The diagram shows threepoints of a motion diagram.The particle changes directionwith no change of speed. Whatis the acceleration at point 2? 2013 Pearson Education, Inc.Slide 8-36
QuickCheck 8.2A toy car moves around a circular track at constantspeed. It suddenly doubles its speed — a change of afactor of 2. As a result, the centripetal accelerationchanges by a factor ofA. 1/4.B. 1/2.C. No change since the radius doesn’t change.D. 2.E. 4. 2013 Pearson Education, Inc.Slide 8-38
QuickCheck 8.3An ice hockey puck is tied by a string toa stake in the ice. The puck is thenswung in a circle. What force or forcesdoes the puck feel?A.B.C.D.E.A new force: the centripetal force.A new force: the centrifugal force.One or more of our familiar forces pushing outward.One or more of our familiar forces pulling inward.I have no clue. 2013 Pearson Education, Inc.Slide 8-44
QuickCheck 8.4An ice hockey puck is tied by astring to a stake in the ice. The puckis then swung in a circle. What forceis producing the centripetalacceleration of the puck?A.GravityB.Air resistanceC.FrictionD.Normal forceE.Tension in the string 2013 Pearson Education, Inc.Slide 8-46
QuickCheck 8.5A car turns a corner on abanked road. Which of thediagrams could be the car’sfree-body diagram? 2013 Pearson Education, Inc.Slide 8-56
QuickCheck 8.6A coin sits on a turntable as thetable steadily rotates ccw. Thefree-body diagrams below show thecoin from behind, moving away fromyou. Which is the correct diagram? 2013 Pearson Education, Inc.Slide 8-66
QuickCheck 8.7A coin sits on a turntable as thetable steadily rotates ccw. Whatforce or forces act in the plane ofthe turntable? 2013 Pearson Education, Inc.Slide 8-68
QuickCheck 8.8Two coins are on a turntable thatsteadily speeds up, starting fromrest, with a ccw rotation. Whichcoin flies off the turntable first?A.Coin 1 flies off first.B.Coin 2 flies off first.C.Both coins fly off at the same time.D.We can’t say without knowing theirmasses. 2013 Pearson Education, Inc.Slide 8-70
QuickCheck 8.9A physics textbook swings backand forth as a pendulum. Which isthe correct free-body diagramwhen the book is at the bottomand moving to the right? 2013 Pearson Education, Inc.Slide 8-78
QuickCheck 8.10A car that’s out of gas coastsover the top of a hill at a steady20 m/s. Assume air resistanceis negligible. Which free-bodydiagram describes the car atthis instant? 2013 Pearson Education, Inc.Slide 8-80
QuickCheck 8.11A roller coaster car does a loopthe-loop. Which of the free-bodydiagrams shows the forces onthe car at the top of the loop?Rolling friction can be neglected. 2013 Pearson Education, Inc.Slide 8-82
QuickCheck 8.12A ball rolls ccw around the insideof a horizontal pipe. The ball isfastest at the lowest point, slowestat the highest point. At the pointshown, with the ball moving down,what is the direction of the netforce on the ball? 2013 Pearson Education, Inc.Slide 8-90
FOR SCIENTISTS AND ENGINEERS physics a strategic approach THIRD EDITION randall d. knight 2013 Pearson Education, Inc. Chapter 8 QuickCheck Questions
