- Which of the following is the rotational analog of force?
(A)
(B)
- Which of the following has a greater moment of inertia?
(A) long, fat leg (C) short, fat leg
(B) long, thin leg (D) short, thin leg
- Which of the following is needed for a rigid body to be in equilibrium?
(A) It must be stable.
(B) The net torque on it must be zero.
(C)The net force acting on it must be zero.
(D)The net force and the net torque acting on it must be zero.
- What will happen if an ice skater spinning on one of her toes extends her arms?
(A) Her moment of inertia and angular velocity will increase.
(B) Her moment of inertia and angular velocity will decrease.
(C)Her moment of inertia will decrease but her angular velocity will increase.
(D)Her moment of inertia will increase but her angular velocity will decrease.
- If considering the moment of inertia of a body, it is convenient to assume as if all
its mass were concentrated at a single point from the center of rotation. What is
this distance called?
(A) center of mass (C) lever arm
(B) center of gravity (D) radius of gyration
- A uniform meterstick is supported at the 50 cm mark. A 25 N weight is placed at
the 10 cm mark. Where should a 200 N weight be placed for the meterstick to be
in equilibrium?
(A) 1.25 cm mark (C) 51.25 cm mark
(B) 5.0 cm mark (D) 55.0 cm mark
- A wheel is rotating at an angular speed of 2.0 radians/s. How much torque is
needed to accelerate it to 4.0 radians/s in 5 s? The wheel has a moment of inertia
of 0.25 kg•m2
(A) 0.01 Nm (C) 1.0 Nm
(B) 0.10 Nm (D) 10 Nm
- Which of the following represents the product of the mass of each particle in a
rotating rigid body and the square of its radius?
(A) Angular momentum (C) moment of inertia
(B) Angular velocity (D) torque
- Which of the following statements is TRUE?
(A) The moment of inertia about an axis parallel to the axis passing through the
center of mass is computed using the parallel axes theorem.
(B) The torque is not affected by the radius from which the force is acted at.
(C)The angular speed of the minute hand of a clock is 10°/min.
(D)The torque is a scalar quantity.
10.Which of the following statements is TRUE?
(A) Rotational kinetic energy is affected by the moment of inertia I of the object.
(B) The moment of inertia of an object does not affect its angular momentum.
(C)The total weight of a body is always concentrated at its center of mass.
(D)Angular momentum is the product of moment of inertia and mass.
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