GenPhy1 Parallel Assessment 1 (Q2)

If a force F is multiplied by the arm length L, we get the

• momentum

• distance

• torque

• inertia

When a wheel is rotating at a constant angular acceleration, which of the following statements must be true?

• The net force acting on the wheel is constant.

• The speed of a point at the rim of the wheel is constant.

• The magnitude of the angular velocity is constant.

• The tangential acceleration of a point at the rim of the wheel is constant.

Two points, A and B, are on a disk that rotates about an axis. Point A is three times as far from the axis as point B. If the linear speed of point B is v, then what is the linear speed of point A?

• v

• 3v

• 9v

• v/3

A turntable rotates through 6 radians in 3 seconds as it accelerates uniformly from rest. What is its angular acceleration in radians per square second?

• 1

• 6

• 1/3

• 4/3

Old-fashioned clocks and watches have an hour hand, a minute hand, and a second hand. What is the angular frequency of the second hand?

• 
  

  $\frac{1}{60}$ rad/s
  

• $\frac{\pi}{60}$ rad/s
  

• $\frac{\pi}{30}$ rad/s
  

• 60 rad/s

The easiest way to open a heavy door is by applying the force

• near the hinges

• at the edge of the door far from the hinges

• in the middle of the door

• at the top of the door

The torque depends on the following EXCEPT

• force

• lever arm

• angle between the force and lever arm

• momentum

When an object is experiencing a net torque

• it is in dynamic equilibrium

• it is in static equilibrium

• it is translating

• it is rotating

A construction worker is worried about applying too much torque to a bolt using his wrench. What could he do to reduce his torque on the bolt?

• increase the length of the wrench

• increase the force on the wrench

• reduce the length of the wrench

• reduce the friction between the bolt and the wrench

A 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 10cm as it turns. What is the torque applied to the wrench?

• 7.5 Nm

• 750 Nm

• 1.5 Nm

• 150 Nm