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- 1. Multiple ChoiceWhich has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?The inside horseThe outside horseNeither - they both have the same angular speed
- 2. Multiple ChoiceIs torque independent of the location of the origin?Yes, always.Yes, as long as the origin is either in the center or on one end.No, you always need to specify the origin.
- 3. Multiple Choice
Torques cause changes in _______.
velocity
moment of inertia
lever arm
angular velocity
- 4. Multiple Choice
The lever arm is the ________ distance from the axis of rotation to the point where the force is exerted.
angular
displaced
perpendicular
none of these
- 5. Multiple Choice
Suppose a doorknob is placed at the center of a door. Compared with a door whose knob is located at the edge, what amount of force must be applied to this door to produce the torque needed to open it?
1/4 as much
1/2 as much
Twice as much
Four times as much
- 6. Multiple Choice
What is the point at which all of the mass of the body and be considered to be concentrated?
Center of Mass
Moment of Inertia
Rotational Equilibrium
Torque
- 7. Multiple Choice
An ice skater is spinning in a circle with his arms extended out. He then brings his arms in, what happens to his rotational velocity?
It increases
It decreases
It stays the same
He stops spinning immediately
- 8. Multiple ChoiceQuestion 12: What is the net torque about the center of mass of the object?a) 0b) Fd, clockwisec) Fd, counterclockwised) 2Fd, clockwise or e) 2Fd, counterclockwise
- 9. Multiple ChoiceA wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?7.5 Nm1.5 Nm750 Nm150 Nm
- 10. Multiple ChoiceThe easiest way to open a heavy door is by applying the forceNear the hingesIn the middle of the doorAt the edge of the door far from the hingesAt the top of the door
- 11. Multiple ChoiceA 800N man is playing on a seesaw with son who has a weight of 200N. If the child is sitting 3 meters away, how far will the man have to sit to balance the seesaw?0.75m3m1.5m1m
- 12. Multiple ChoiceTorque is the product of a force exerted on an object times the lever arm.TrueFalse
- 13. Multiple Choice
What force does not cause any torque?
Force perpendicular to the fulcrum.
Force horizontal to the planck.
Force slightly off center of the fulcrum
Forces at a 45 degree angle to the fulcrum, and not on the fulcrum
- 14. Multiple ChoiceIn the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?L/2L/3L/4L/6
- 15. Multiple ChoiceIf the torque required to loosen a nut on the wheel of a car has a magnitude of 60.0 N• m, what minimum perpendicular force must be exerted by a mechanic at the end of a 45.0 cm wrench to loosen the nut?.666 Nm133.3 N66.7 N13.3 Nm
- 16. Multiple ChoiceWhat is the distance the masses on the right of the fulcrum need to be to balance with the two masses on the left?.65 m.56 m.79 m.39 m
- 17. Multiple ChoiceWhat direction is the torque acting with respect to post A?clockwiseCounter clockwiseNeither DirectionDepends on the mass of the diver
- 18. Multiple ChoiceFind the magnitude of the torque produced by a 22.0 N force applied to a door at a 30 degree from the perpendicular distance of .005 km from the hinge.55 Nm.015 Nm6.3 Nm8.75 Nm
- 19. Multiple ChoiceA person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,her moment of inertia increases and her angular speed decreases.her moment of inertia decreases and her angular speed increases.her moment of inertia increases and her angular speed increases.her moment of inertia increases and her angular speed remains the same.
- 20. Multiple ChoiceIn order to do a lot of flips an Olympic diver would want:A high rotational inertiaA low rotational inertiaA low linear accelerationA low angular velocity
- 21. Multiple ChoiceWhat happens to his rotational inertia when a figure skater brings in his arms?Increase his rotational inertiaDecrease his rotational inertiahas no affect
- 22. Multiple ChoiceBecause of inertia, a moving object will keep ________.at restmovingin one spotinertia
- 23. Multiple ChoiceBecause of inertia, a resting object will remain at ________.resta constant speedschoolinertia
- 24. Multiple ChoiceYou push on a car and it does not move. What is true about the inertia?The inertia is changingThe inertia of the car is too greatThe inertia of the person is equal to the carThere is not inertia because of no movement
- 25. Multiple ChoiceBecause a hollow ball has a higher moment of inertia than a solid ball...The solid ball rolls fasterThe solid ball weighs more.The solid ball weighs less.They both accelerate at the same rate.
- 26. Multiple ChoiceIf a ball moves with slipping down a rampit goes slower than if it had rolled downit moves faster than if it had rolled down.It doesn't make a difference about friction or not friction.Friction slows it down.
- 27. Multiple Choice
What is the total kinetic energy of a 3 kg solid disk (I = 1/2mr2) with a diameter of 80 cm rolling at 4 m/s?
12 J
24 J
36 J
48 J
- 28. Multiple ChoiceA cylinder (I=1/2mr2) and a hoop (I=mr2) of the same radius and same mass are traveling at the same angular velocity (ω). What is the ratio of the rotational kinetic energy of the cylinder to the rotational kinetic energy of the hoop?1:11:22:11:4
- 29. Multiple ChoiceThe figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P?ABCD
- 30. Multiple ChoiceThree homogeneous ridged bodies -- a solid shere, a solid cylinder, and a hollow cylinder -- are placed at the top of an incline. If all are released from rest at the same elevation and rolls without slipping, which reaches the bottom first?The solid sphere.The solid cylinder.The hollow cylinder.They will all arrive at the same time.
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