Learning goal: 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= f*s=/f/ /s/ cosθ
,

where w is the work done by force f on the object that undergoes displacement s directed at angle θ relative to f .

note that depending on the value of cosθ, the work done can be positive, negative, or zero.