Which situations show examples of work occurring? Check all that apply.A student carries a stack of books to the library.A shopping cart is pushed through a parking lot.A hockey puck slides on ice, with constant velocity.An airplane slows to a stop on a runway.A pool ball bounces off the edge of a pool table.

Work occurs when a force acts through a displacement in the force’s direction or opposite it. The push on the shopping cart does work, and the runway’s braking force does negative work as the airplane moves and slows down. The pool table’s edge exerts a force on the moving ball that changes its motion, so work occurs. Carrying books horizontally applies an upward force perpendicular to their motion, and the puck’s constant velocity means the net work on it is zero.

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