美國高中 Physics ME #001 A shopper in a supermarket pushes a cart
with a force of 35 N directed at an angle of 25◦ downward from
the horizontal. The force is just sufficient to overcome the various
frictional forces, so the cart moves at a constant speed. (a) Find
the work done by the shopper as she moves down a 50-m length of
aisle.
(b) What is the net work done on the cart?
Why?
(c) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the work done by frictional forces doesn't change, would the shopper's applied force be larger, smaller, or the same? What about the work done on the cart by the shopper?
0 Comments