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Terms in this set (23)
Torque is defined as ________.
force times lever arm
If a football is kicked so the force on the ball is through its center of gravity, the ball will _______.
move without any tumbling or spining
Which has more rotational inertia, a bicycle wheel or a solid disk of the same mass and diameter?
Which objects roll down an incline with the greatest acceleration?
objects with small rotational inertia
A person's rotational inertia is least about _______.
the person's longitudinal axis
Angular momentum is defined as ___________.
momentum times rotational velocity
When an ice skater pulls in his hands to turn faster ____.
angular momentum must be converted, his moment of inertia changes, his rotational speed changes. ALL OF THE ABOVE
Suppose a huge rotating cloud of particles in space gravitates together to form a dense ball. As the cloud shrinks in size it rotates ___________.
To turn a stubborn screw, it is best to use a screwdriver that has a ____________.
Which rolls to the bottom of a hill sooner, an empty car tire or the same tire mounted on a rim?
the mounted tire, regardless of its weight
A good explanation of why a ball gains speed as it rolls down an incline involves the _________.
concentrated rotational inertia of the ball, force that acts on it, friction between it and the incline, torque that acts on it. ALL OF THE ABOVE
A common thread spool rests on a flat table. You gently pull in a horizontal direction on a short piece of thread attached to (wrapped around) the spool. The spool will roll toward you _________.
whether the string is wound over or under the spool
A meter stick is balanced at the 50-cm mark. you tie a 20-N weight at the 30-cm mark. where should a 30-N weight be placed so the meter stick will again be balanced?
70 cm mark
The distance between a turning axis and the point of contact of a perpendicular force is called the fulcrum.
Torque is the product of a force exerted on an object times the lever arm.
rotational inertia is the resistance on object has to changes in its rotational state.
in order for a seesaw to be in rotational equilibrium, the sum of the torque. ..
if you kick a football through its center of gravity it will tumble as it sails through the air.
in order to increase his or her rotational inertia, a tightrope. ..
a short pendulum. ..
gymnasts change their. ..
a spinning wheel will maintain its state of angular momentum unless acted on by an external torque.
ice skaters can increase their spin rate by the conservation of angular momentum.
THIS SET IS OFTEN IN FOLDERS WITH...
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Chapter 11 Physics
Conceptual Physics Test 11/12
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