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© 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it  should never be made available to students except by instructors using the accompanying text in their classes. All recipients of this work are expected to abide by these restrictions and to honor the intended pedagogical purposes and the needs of other instructors who rely on these materials. ConcepTest   PowerPoints Chapter 5 Physics: Principles with Applications, 6 th  edition Giancoli
ConcepTest 5.1   Tetherball ,[object Object],1)  toward the top of the pole 2)  toward the ground 3)  along the horizontal component of the tension force 4)  along the vertical component of the tension force 5)  tangential to the circle W T
[object Object],ConcepTest 5.1   Tetherball The  vertical component of the tension  balances the  weight .  The  horizontal component of tension  provides the  centripetal force  that points toward the center of the circle. 1)  toward the top of the pole 2)  toward the ground 3)  along the horizontal component of the tension force 4)  along the vertical component of the tension force 5)  tangential to the circle W T W T
[object Object],ConcepTest 5.2a   Around the Curve I (1)  you are thrown to the right (2)  you feel no particular change (3) you are thrown to the left (4) you are thrown to the ceiling (5)  you are thrown to the floor
[object Object],ConcepTest 5.2a   Around the Curve I (1)  you are thrown to the right (2)  you feel no particular change (3) you are thrown to the left (4) you are thrown to the ceiling (5)  you are thrown to the floor The passenger has the tendency to continue moving in a straight line.  From your perspective in the car, it feels like you are being thrown to the right, hitting the passenger door.
[object Object],ConcepTest 5.2b   Around the Curve II (1)  centrifugal force is pushing you into the door (2)  the door is exerting a leftward force on you (3)  both of the above (4)  neither of the above
[object Object],ConcepTest 5.2b   Around the Curve II (1)  centrifugal force is pushing you into the door (2)  the door is exerting a leftward force on you (3)  both of the above (4)  neither of the above The passenger has the tendency to continue moving in a straight line.  There is a centripetal force, provided by the door, that forces the passenger into a circular path.
ConcepTest 5.3   Missing Link ,[object Object],1 2 3 5 4
ConcepTest 5.3   Missing Link ,[object Object],[object Object],Follow-up:   What physical force provides the centripetal force? 1 2 3 5 4
ConcepTest 5.4   Ball and String ,[object Object],1)  T 2   =  1/4  T 1 2)  T 2   =  1/2  T 1 3)  T 2   =  T 1 4)  T 2   =  2  T 1 5)  T 2   =  4  T 1 1 2
ConcepTest 5.4   Ball and String ,[object Object],The centripetal force in this case is given by the tension, so  T  =  mv 2 / r .  For the same period, we find that  v 2  = 2 v 1  (and this term is squared).  However, for the denominator, we see that  r 2  = 2 r 1  which gives us the relation  T 2  = 2 T 1 . 1)  T 2   =  1/4  T 1 2)  T 2   =  1/2  T 1 3)  T 2   =  T 1 4)  T 2   =  2  T 1 5)  T 2   =  4  T 1 1 2
ConcepTest 5.5   Barrel of Fun ,[object Object],1 2 3 4 5
ConcepTest 5.5   Barrel of Fun ,[object Object],The  normal force  of the wall on the rider provides the  centripetal force  needed to keep her going around in a circle.  The  downward force of gravity is balanced by the upward frictional force  on her, so she does not slip vertically. Follow-up:   What happens if the rotation of the ride slows down? 1 2 3 4 5
ConcepTest 5.6a   Going in Circles I ,[object Object],1)  N  remains equal to  mg 2)  N  is smaller than  mg 3)  N  is larger than  mg 4) None of the above
ConcepTest 5.6a   Going in Circles I ,[object Object],1)  N  remains equal to  mg 2)  N  is smaller than  mg 3)  N  is larger than  mg 4) None of the above You are in circular motion, so there has to be a centripetal force pointing  inward .  At the top, the only two forces are  mg  (down)  and  N  (up) , so  N  must be smaller than  mg .   Follow-up:   Where is  N  larger than  mg ?
[object Object],ConcepTest 5.6b   Going in Circles II 1)  F c   =  N  +  mg 2)  F c   =  mg  –  N 3)  F c   =  T  +  N  –  mg 4)  F c   =  N 5)  F c   =  mg R v
[object Object],ConcepTest 5.6b   Going in Circles II R v ,[object Object],m g N Follow-up:   What happens when the skier goes into a small dip? 1)  F c   =  N  +  mg 2)  F c   =  mg  –  N 3)  F c   =  T  +  N  –  mg 4)  F c   =  N 5)  F c   =  mg
[object Object],ConcepTest 5.7c   Going in Circles III 1)  F c   =  T  –  mg 2)  F c   =  T  +  N  –  mg 3)  F c   =  T  +  mg 4)  F c   =  T  5)  F c   =  mg R v top
[object Object],ConcepTest 5.7c   Going in Circles III R v T m g   F c  points toward the center of the circle,  i.e . downward in this case.   The  weight vector  points  down  and the  tension   (exerted by the string) also points  down .  The magnitude of the net force, therefore, is:  F c   =  T  +  mg Follow-up:   What is  F c  at the bottom of the ball’s path? 1)  F c   =  T  –  mg 2)  F c   =  T  +  N  –  mg 3)  F c   =  T  +  mg 4)  F c   =  T  5)  F c   =  mg
ConcepTest 5.8a   Earth and Moon I ,[object Object],1)  the Earth pulls harder on the Moon 2)  the Moon pulls harder on the Earth 3)  they pull on each other equally 4)  there is no force between the Earth and the Moon 5) it depends upon where the Moon is in its orbit at that time
ConcepTest 5.8a   Earth and Moon I ,[object Object],By Newton’s 3 rd  Law, the forces are equal and opposite. 1)  the Earth pulls harder on the Moon 2)  the Moon pulls harder on the Earth 3)  they pull on each other equally 4)  there is no force between the Earth and the Moon 5) it depends upon where the Moon is in its orbit at that time
ConcepTest 5.8b   Earth and Moon II ,[object Object],1)  one quarter 2)  one half 3)  the same 4)  two times 5)  four times
ConcepTest 5.8b   Earth and Moon II ,[object Object],The gravitational force depends inversely on the distance squared.  So if you  increase  the  distance  by a factor of  2 , the  force  will  decrease  by a factor of  4 . 1)  one quarter 2)  one half 3)  the same 4)  two times 5)  four times Follow-up:   What distance would  increase  the force by a factor of  2 ?
ConcepTest 5.9   Fly Me Away You weigh yourself on a scale inside an airplane that is flying with constant speed at an  altitude of 20,000 feet .  How does your measured weight in the airplane compare with your weight as measured on the surface of the Earth?   1)  greater than 2)  less than 3)  same
ConcepTest 5.9   Fly Me Away You weigh yourself on a scale inside an airplane that is flying with constant speed at an  altitude of 20,000 feet .  How does your measured weight in the airplane compare with your weight as measured on the surface of the Earth?   1)  greater than 2)  less than 3)  same At a high altitude, you are farther away from the center of Earth.  Therefore, the gravitational force in the airplane will be less than the force that you would experience on the surface of the Earth.
ConcepTest 5.10   Two Satellites ,[object Object],1)  1/8 2)  1/4 3)  1/2 4)  it’s the same 5)  2
ConcepTest 5.10   Two Satellites ,[object Object],Using the Law of Gravitation:    we find that the ratio is 1/4. 1)  1/8 2)  1/4 3)  1/2 4)  it’s the same 5)  2 Note the  1/ r 2  factor
ConcepTest 5.11   Averting Disaster ,[object Object],1) it’s in Earth’s gravitational field 2) the net force on it is zero 3) it is beyond the main pull of Earth’s gravity 4) it’s being pulled by the Sun as well as by Earth 5) none of the above
ConcepTest 5.11   Averting Disaster ,[object Object],The Moon does not crash into Earth because of its high speed.  If it stopped moving, it would, of course, fall directly into Earth.  With its high speed, the Moon would fly off into space if it weren’t for gravity providing the centripetal force.   1) it’s in Earth’s gravitational field 2) the net force on it is zero 3) it is beyond the main pull of Earth’s gravity 4) it’s being pulled by the Sun as well as by Earth 5) none of the above Follow-up:   What happens to a satellite orbiting Earth as it slows?
ConcepTest 5.12   In the Space Shuttle ,[object Object],1) They are so far from Earth that Earth’s gravity doesn’t act any more. 2) Gravity’s force pulling them inward is cancelled by the centripetal force pushing them outward. 3) While gravity is trying to pull them inward, they are trying to continue on a straight-line path. 4) Their weight is reduced in space so the force of gravity is much weaker.
ConcepTest 5.12   In the Space Shuttle ,[object Object],Astronauts in the space shuttle float because they are in “free fall” around Earth, just like a satellite or the Moon.  Again, it is gravity that provides the centripetal force that keeps them in circular motion. 1) They are so far from Earth that Earth’s gravity doesn’t act any more. 2) Gravity’s force pulling them inward is cancelled by the centripetal force pushing them outward. 3) While gravity is trying to pull them inward, they are trying to continue on a straight-line path. 4) Their weight is reduced in space so the force of gravity is much weaker. Follow-up:   How weak is the value of  g  at an altitude of  300 km ?
ConcepTest 5.13   Guess My Weight If you weigh yourself at the equator of Earth, would you get a bigger, smaller, or similar value than if you weigh yourself at one of the poles?   1)  bigger value 2)  smaller value 3)  same value
ConcepTest 5.13   Guess my Weight If you weigh yourself at the equator of Earth, would you get a bigger, smaller, or similar value than if you weigh yourself at one of the poles?   1)  bigger value 2)  smaller value 3)  same value The weight that a scale reads is the  normal force  exerted by the floor (or the scale).  At the equator,  you are in circular motion , so there must be a  net inward force  toward Earth’s center.  This means that the  normal force must be slightly less than  mg .  So the scale would register something less than your actual weight.
ConcepTest 5.14   Force Vectors ,[object Object],1 2 3 4 5 2 d d 2 m m Earth
ConcepTest 5.14   Force Vectors The force of gravity on the Earth due to  m  is  greater  than the force due to  2 m , which means that the force component pointing down in the figure is greater than the component pointing to the right. F 2m = GM E ( 2 m ) / ( 2 d ) 2  =  1/2 GM m  /  d 2   F m = GM E   m  /  d 2   =  GM m  /  d 2   A planet of  mass  m  is a  distance d  from Earth.  Another planet of  mass 2 m  is a  distance 2 d  from Earth.  Which force vector best represents the direction of the  total gravitation force  on Earth? 1 2 3 4 5 2 d d 2 m m

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P P A6 Concep Tests Ch 05

  • 1. © 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by instructors using the accompanying text in their classes. All recipients of this work are expected to abide by these restrictions and to honor the intended pedagogical purposes and the needs of other instructors who rely on these materials. ConcepTest PowerPoints Chapter 5 Physics: Principles with Applications, 6 th edition Giancoli
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  • 24. ConcepTest 5.9 Fly Me Away You weigh yourself on a scale inside an airplane that is flying with constant speed at an altitude of 20,000 feet . How does your measured weight in the airplane compare with your weight as measured on the surface of the Earth? 1) greater than 2) less than 3) same
  • 25. ConcepTest 5.9 Fly Me Away You weigh yourself on a scale inside an airplane that is flying with constant speed at an altitude of 20,000 feet . How does your measured weight in the airplane compare with your weight as measured on the surface of the Earth? 1) greater than 2) less than 3) same At a high altitude, you are farther away from the center of Earth. Therefore, the gravitational force in the airplane will be less than the force that you would experience on the surface of the Earth.
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  • 32. ConcepTest 5.13 Guess My Weight If you weigh yourself at the equator of Earth, would you get a bigger, smaller, or similar value than if you weigh yourself at one of the poles? 1) bigger value 2) smaller value 3) same value
  • 33. ConcepTest 5.13 Guess my Weight If you weigh yourself at the equator of Earth, would you get a bigger, smaller, or similar value than if you weigh yourself at one of the poles? 1) bigger value 2) smaller value 3) same value The weight that a scale reads is the normal force exerted by the floor (or the scale). At the equator, you are in circular motion , so there must be a net inward force toward Earth’s center. This means that the normal force must be slightly less than mg . So the scale would register something less than your actual weight.
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  • 35. ConcepTest 5.14 Force Vectors The force of gravity on the Earth due to m is greater than the force due to 2 m , which means that the force component pointing down in the figure is greater than the component pointing to the right. F 2m = GM E ( 2 m ) / ( 2 d ) 2 = 1/2 GM m / d 2 F m = GM E m / d 2 = GM m / d 2 A planet of mass m is a distance d from Earth. Another planet of mass 2 m is a distance 2 d from Earth. Which force vector best represents the direction of the total gravitation force on Earth? 1 2 3 4 5 2 d d 2 m m