As you drag a box along the floor, the work done by kinetic friction is ALWAYS (

Question

As you drag a box along the floor, the work done by kinetic friction is ALWAYS
(A) zero
(B) positive
(C) negative
(D) not enough information

Consider an object moving clockwise in a circular path in the xy plane.
What is the direction of the centripetal force acting on the object when
it reaches point P?
(A) +y direction
(B) ?y direction
(C) +x direction
(D) ?x direction

An object is launched upward. Which of the following quantities is conserved as the object rises?
(A) total momentum (D) total mechanical energy
(B) kinetic energy (E) A and D
(C) gravitational potential energy (F) none of the above

A turntable spins at a constant 45 rpm clockwise. The net torque acting on the turntable
(A) equals zero.
(B) is greater than zero.
(C) is less than than zero.
(D) not enough information.

Explanation / Answer

C D A D

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