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by BlastRoom
Calculate mechanical work and decide when a force does zero or negative work.
#physics
40 questions
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A force acts through a distance along its own line of action. The work done by that force is measured in which SI unit?
For a constant force that is parallel to an object's displacement, which relationship gives the work done by the force?
A force of magnitude F acts on an object that has displacement d, with angle θ between the force and displacement. Which formula gives the work done by that force?
Which condition must be true for a force to do mechanical work on an object?
A force is perpendicular to the displacement of an object. What work does that force do?
A student pushes hard on a locked door, but the door's displacement is 0 m. How much work does the student's force do on the door?
Which expression is equivalent to 1 joule of work?
A force acts opposite the displacement of an object. What is the sign of the work done by that force?
A student pulls a wagon with a constant 35 N force in the same direction the wagon moves for 2.0 m. How much work does the pull do on the wagon?
A motor pulls a sled forward with a constant 180 N force through a displacement of 0.50 m in the same direction. What work does the motor do?
A horizontal force of N pushes a crate 3.0 m in the force's direction. How much work does the force do?
An elevator cable exerts an upward force of 900 N while the elevator moves upward 2.0 m. How much work does the cable do on the elevator?
A cart is pulled straight forward by a 45 N force for 12 m. How much work is done by the pulling force?
A spring scale pulls a block with a constant 18 N force over a straight 0.30 m displacement in the same direction. What work does the scale do?
A dock worker pushes a crate with a 250 N horizontal force for 1.6 m along the dock. What work does the worker's force do on the crate?
A lab cart is pushed with a constant 6.0 N force over 0.75 m in the same direction. How much work is done on the cart by that push?
A mower is pushed forward by a constant horizontal force of 75 N through a distance of 20 m. How much work does the pushing force do?
A weightlifter exerts a 40 N upward force on a small training bar while raising it 1.2 m. How much work does the lifter do on the bar?
A person holds a box stationary with an upward force of 65 N for 10 s. The box's displacement is 0 m. What work does the person do on the box?
A student carries a 6.0 kg box at steady height for 12 m along a level hallway. Take g = 9.8 m/s², so the hands push upward with 59 N. What work do the hands do?
A puck slides 4.0 m across a level table while the table's normal force on it is 20 N upward. How much work does the normal force do on the puck?
A cart moves 3.0 m horizontally while Earth's gravitational force on it is 98 N downward. How much work does gravity do during this horizontal motion?
A cabinet is pushed against a wall with a horizontal 120 N force, but the cabinet does not move. Its displacement is 0 m. What work does the push do?
A porter lifts upward on a suitcase with a 200 N force while walking 15 m horizontally at constant height. How much work does the upward force do on the suitcase?
A toy car moves 2.0 m along a circular path while a string pulls inward with a 10 N tension perpendicular to the car's instantaneous motion. What work does the tension do?
A charged bead moves 0.40 m east while a magnetic force of 0.80 N on it points north. What work does the magnetic force do over that displacement?
Use the vector figure showing force F and displacement D from the same tail. What work does force F do?
The vector figure gives the force F, displacement D, and the angle between them. What is the work done by F?
In the vector diagram, force F acts at the shown angle to displacement D. How much work does F do?
Read the force, displacement, and angle from the vector figure. What work is done by force F?
The vector figure shows force F at an angle to displacement D. What is the work done by F?
The vector figure shows F making an obtuse angle with displacement D. What work does F do on the object?
Use the vector diagram to find the work done by F during displacement D.
The diagram gives the magnitude of F, the displacement D, and their angle. What work is done by F?
A sled travels 15 m in the positive direction while kinetic friction on it is 24 N opposite the motion. How much work does friction do?
A box slides 5.0 m in the +x direction while a 30 N kinetic friction force acts in the −x direction. What work does friction do on the box?
A bicycle moves forward 8.0 m while the brakes exert a 120 N force backward. Take the forward direction as positive. What work do the brakes do?
A ball rises 20 m while air resistance of 15 N acts downward. Take upward as positive. What work does air resistance do during the rise?
A crate is lowered 1.5 m downward while a rope pulls upward with a 400 N force. Take downward as positive. What work does the rope do on the crate?
A swimmer moves 25 m east while water drag on the swimmer is 18 N west. Take east as positive. What work does drag do?
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Potential Energy
40 questions
