POINSS A smoothly rolling small solid uniform disk with initial linear speed. v

Question

POINSS A smoothly rolling small solid uniform disk with initial linear speed. v True/False (1 pt each) 1) A constant torque is required to maintain constant angular motion of an object 2) For a closed isolated system the total energy can never change. 3) 4 Linear momentum is always conserved for any system (TRUE / FALSE) 5) If an object spins with finite angular velocity that is decreasing in magnitude, then the TRUE/FALSE) TRUE/FALSE Angular momentum is always conserved for any system. (TRUE /FALSE) vectors that represent the angular velocity and angular acceleration of the object must be pointing in opposite directions. (TRUE /FALSE 6) Angular position, unlike angular velocity and angular acceleration, is not a vector 7) Kinetic energy of two colliding objects is conserved only if the objects undergo a 8) Work is defined as the energy into or out of a system by way of a force. 9) The center of mass of a system containing only the following two objects, a quantity. (TRUE/FALSE) completely inclastic collision. (TRUE/ FALSE) TRUE/FALSE) uniformly distributed 2000kg sphere of lead and a uniformly distributed 2000kg sphere of feathers, is located directly between the center points of the two spheres. (TRUE /FALSE) 10) A simple pendulum in motion about a point of rotation is never in equilibrium. (TRUE/FALSE)

Explanation / Answer

1] False, net torque has to be zero otherwise it will experience angular acceleration.

2] False, energy decreases on collisions, it is momentum which is conserved.

3] False, it is conserved only when there is no net torque.

4] False, it is conserved only when there is no net force.

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