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Revision notes on Work for the Cambridge O Level Physics syllabus, written by the Physics experts at Save My Exams.
Review the units of work, energy, force, and distance. Use the equations for mechanical energy and work to show what is work and what is not. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense.
Force-Distance graphs If the force is non-uniform then the formula W = F × d does not apply. Instead, we present the information as a force-distance graph and calculate the area beneath the graph to find the work done by the force. Recall the other “area under a graph”, which is the force-time graph that gives the impulse of a force.
know that energy can be measured in joules, know that energy of different categories can be transferred to and from work, calculate work done using the following formula: work done = force × distance.
Learn how to calculate the work done on an object using a force vs. distance graph and see examples that walk through sample problems step-by-step for you to improve your physics knowledge...
Calculate the work done by a 2.0-N force (directed at a 30° angle to the vertical) to move a 500 gram box a horizontal distance of 400 cm across a rough floor at a constant speed of 0.5 m/s. (HINT: Be cautious with the units.)
Work refers to an activity involving a force and movement in the directon of the force. A force of 20 newtons pushing an object 5 meters in the direction of the force does 100 joules of work.
