Why is it important to know the direction of the force applied to a moving object and the direction in which the object is moving when determining the work done on the object?
Answer
A
When there is an angle between the two directions, the cosine of the angle must be considered.
B
A force at a right angle to the motion requires the use of the sine of the angle.
C
Only the component of the force perpendicular to the motion is used to calculate the work.
D
If the force acts in the same direction as the motion, then no work is done.