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Physics; Chapter 11
Terms in this set (31)
Torque is defined as
Force times lever arm
Suppose you try loosening a nut with a wrench, and the nut doesn't give at all. You increase your chance of success if you?
A: Extend the lever arm.
B: Be sure to exert force perpendicular to the lever arm.
C: Exert a larger force.
D: Have a friend help you pull on the wrench.
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 spinning.
The resistance an object has to change in its rotational state of motion is call rotational
Which has more rotational inertia (resistance to change), a bicycle wheel or a solid disk of the same mall and diameter?
Which has more rotational inertia (resistance to change), a girl running with her legs bent or the same girl running with her legs bent?
With straight legs.
Objects with small rotational intertia will roll down an incline with a greater or less acceleration?
Any solid cylinder will roll down an incline with a greater acceleration than any hollow cylinder if the
Mass of the solid cylinder is large.
A person's rotational inertia is least about their
When a gymnast moves from an extended position to a tucked position, she
Decreases her rotational inertia
True or false: An object will maintain its angular momentum unless acted on by an unbalanced force
When an ice skater pulls his hands to turn faster what will happen?
A: Angular momentum must be conserved.
B: His moment of inertia changes.
C: His rotational speed changes.
If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would
Suppose a huge rotation cloud of particles in space gravitates together to form a dense ball. As the cloud shrinks in size it would rotate
Two people sit on a balanced seesaw. When one person leans toward the center of the seesaw, that person's end of the seesaw will?
To turn a stubborn screw, it's best to use a screwdriver that has a
Suppose a carnival Ferris wheel has seats that are located halfway between the center and the outside rim. Compared to the ordinary Ferris wheel, where the seats are on the outside rim, your angular speed on this Ferris wheel would be?
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 ring and a disk roll down a hill together. Which reaches the bottom first?
A good explanation of why a ball gains speed as it rolls down an incline involves the:
A:Force that acts on it.
B: Torque that acts on it.
C: Concentrated rotational inertia of the ball.
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 towards you only if?
The string is wound over the top of the spool spindle.
A ring, a disk, and a solid ball having equal masses roll down a hill at the same time. Which reaches the bottom first?
True or false: The distance between a turning axis and the point of contact of a perpendicular force is called the fulcrum.
False; it's actually the lever arm.
True or false: Torque is the product of a force exerted on an object times the lever arm.
True or false: Rotational Inertia is the resistance an object has to change in its rotational state.
True or false: In order for a seesaw to be in rotational equilibrium, the sum of the torques acting on it need not be balanced if one person sits closer to the fulcrum than the other person.
False; Have to have a balanced torque.
True or false: If you kick a football through its center of gravity it will tumble as it sails through the air.
True or false: In order to increase his or her rotational inertia, a tightrope walker can carry a long stick.
True or false: A short pendulum has more rotational inertia than a long pendulum of the same mass.
True or false: Gymnasts change their rotational inertia while going through gymnastic routines.
True or false: A spinning wheel will maintain its state of angular momentum unless acted on by an external torque.
THIS SET IS OFTEN IN FOLDERS WITH...
Chapter 11 Physics
rotational mechanics ch 11
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