What are the units for each of the variables?
In the scientific context, what is the
criteria for work to be done?
Give three examples of the use of the word
“work” that do not fit the scientific definition.
A sled is pulled by a rope that makes and
angle above the horizontal. If the force on the rope is 50 N, does that
mean that the force doing the work is 50 N? If not, explain what force
is doing the work.
On page 169, the equation given for net
work includes the “cos q.” Why can you use only the cosine and not the
If a tugboat pulls a ship with a constant
net horizontal force 5000 N and causes the ship to move through a harbor.
How much work is done on the ship if it moves a distance of 3 km?
If 2.0 J of work is done in raising an
apple with 0.5 N of force, how far is it lifted?
A shopper in a supermarket pushed a cart
with a force of 35 N directed at an angle of 25° downward from the
horizontal. Find the work being done by the shopper on the cart as
the shopper moves along a 50 m length of aisle.
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