To be able to calculate work done by a constant force directed
at different angles relative to displacement
If an object undergoes displacement while being acted upon by
a force (or several forces), it is said that work is being done on
the object. If the object is moving in a straight line and the
displacement and the force are known, the work done by the
force can be calculated as
$W = Fs \cos \theta$,
where $W$ is the work done by force $\vec{F}$ on the object that
undergoes displacement $\vec{s}$ directed at angle $\theta$ relative to $\vec{F}$.
Note that depending on the value of $\cos \theta$, the work done can
be positive, negative, or zero.
In this problem, you will practice calculating work done on an
object moving in a straight line. The first series of questions is
related to the accompanying figure. (Figure 1)
In the next series of questions, you will use the formula $W = F's \cos \theta$ to calculate the work done by various forces on an object that moves 160 meters to the
right as shown in (Figure 2).
Part H
Find the work $W$ done by the 18-newton force.
Use two significant figures in your answer. Express your answer in joules.
$W = 3000$
J
Incorrect; Try Again
Review your calculations and make sure you round to 2 significant figures in the last step.
Part I Complete previous part(s)
Part J Complete previous part(s)
Part K Complete previous part(s)
