3. Energy and Work
Work Concept — Quiz
Test your understanding of work concept with 5 practice questions.
Practice Questions
Question 1
A person pushes a box with a force of $50 \text{ N}$ at an angle of $30^\circ$ below the horizontal. If the box moves $4 \text{ m}$ horizontally, what is the work done by the person on the box?
Question 2
An object is pulled up a frictionless incline at a constant velocity. The incline makes an angle of $30^\circ$ with the horizontal. If the object has a mass of $10 \text{ kg}$ and is pulled $5 \text{ m}$ along the incline, what is the work done by the pulling force?
Question 3
A car's engine does $5000 \text{ J}$ of work to move the car $25 \text{ m}$ forward. If the car experiences a constant resistive force of $100 \text{ N}$ due to friction and air resistance, what is the magnitude of the force exerted by the engine?
Question 4
A person pushes a box horizontally with a force of $75 \text{ N}$ for a distance of $6 \text{ m}$. If the box moves at a constant velocity, what is the work done by the frictional force?
Question 5
A construction worker pulls a beam with a rope. The rope makes an angle of $45^\circ$ with the horizontal. If the worker does $300 \text{ J}$ of work by pulling the beam $10 \text{ m}$ horizontally, what is the tension in the rope?