A shopper in a supermarket pushes a cart with a force of 39.72 N directed at an angle of 30.0° below the horiz?
A shopper in a supermarket pushes a cart with a force of 39.72 N directed at an angle of 30.0° below the horizontal. The force is just sufficient to balance various friction forces, so the cart moves at constant speed.
Find the work done by the shopper on the cart as she moves down a 40.8-m-long aisle.
What is the net work done on the cart by all forces?
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the work done by the pushing force is force in direction of displacement x displacement
work = 39.72N cos 30 x 40.8m = 1403N
the sum of all forces on the cart is zero (we know this since it is moving at constant speed), therefore there is no change in kinetic energy of the cart and therefore no net work done