Work and Power Example Solutions
Follow along with common work and power example problems and solutions. See how to solve problems when force is applied directly parallel or at an angle.
Example Work and Power Problems
1. How much work is done by the stickman that pushes a box 5 meters with a force of 12 Newtons forward?
W = (F)(d)
Since the force is in the same direction as motion you plug numbers directly in and don't have to find the parallel component first.
W = (12)(5) = 60 J
2. What is the power output of the stickman that pushes the box 5 meters in 3 seconds with a constant force of 12 N?
3. How much work would be done if 12N of force was applied on an object at an angle of 25° above the horizon to move an object 5 meters horizontally.
A) Find the horizontal component of force:
adj = (cosӨ)(hyp)
adj = (cos(25°))(12)= 10.9 N
B) Find out how much work is done by this component:
W = (F)(d)
W = (10.9)(5) = 54.5 J
4. What is the power output if 12N of force was applied on an object at an angle of 25° above the horizon to move an object 5 meters horizontally in 3 seconds.
Use the work from the problem above
P = W/t
P = 54.5/3 = 18.2 W
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