Transcript Problem: Suppose I pull a package with a force of

Problem: Suppose I pull a package
with a force of 98 N at an angle of 55°
above the horizontal ground for a
distance of 60m. What is the total
work done by me on the package?
Problem : A snail massing .23 kg
slides down an incline of 25° at a
constant velocity. The snail
slides 1.5 m. What is the work done
by the normal force, by gravity, and
by friction? What is the total work done
on the snail?
We can start by applying Newton's Second
Law and determining the force of friction.
Now we need to determine the
Normal Force
Now what is the work done by each
individual force.
Work done by the Frictional Force:
Work done by the
Gravitational Force:
Now, to finally determine the "netWork" we add them all up!
We could have really determined this
from the fact that the snail was sliding
at "constant velocity" thus there is no
"net-force" acting on the snail, thus
Wnet=0J.