Rotational Motion and Rotational Dynamics

If the net torque on an object is 0, then the object will

• not rotate or rotate at a constant angular velocity.

• rotate with a constant angular acceleration.

• not rotate or move in a straight line.

• not move in a straight line.

If a net torque is applied to an object, that object will experience which of the following? (A net torque means a net torque that is NOT 0!)

• A constant angular speed

• A constant moment of inertia

• An angular acceleration

• An increasing moment of inertia

Which of the following statements is correct?

• The closer the force is to the axis of rotation, the easier it is to rotate the object.

• The closer the force is to the axis of rotation, the more torque that is produced.

• The farther the force is to the axis of rotation, the less torque that is produced.

• The farther the force is to the axis of rotation, the more torque that is produced.

At what angle should the force be applied to a wrench to produce the maximum torque?

• 0⁰ to the handle

• 90⁰ to the handle

• 180⁰ to the handle

• 360⁰ to the handle

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

If you want to open a swinging door with the least amount of force, where should you push on the door?

• As far from the hinges as possible

• Close to the hinges

• In the middle

• It does not matter where you push

Tags

NGSS.HS-PS2-1

If you cannot exert enough force to loosen a bolt with a wrench, which of the following should you do?

• Exert a force on the wrench closer o the bolt

• Tie a rope to the end of the wrench and pull

• Use a wrench with a longer handle

• Use a wrench with a shorter handle

Tags

NGSS.HS-PS2-1

At which point along a claw hammer is the center of mass best located?

• In the middle of the handle

• Closer to the end of the handle without the head

• Closer to the head end of the handle

Which of the following affects the total kinetic energy of a football thrown with a spinning motion?

• The ball's angular speed only

• The ball's linear speed only

• Both the linear and angular speeds

• Neither the linear nor the angular speeds

Tags

NGSS.HS-PS3-2

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