# Work done

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• Physics:Work Done
• work is done when a force is exerted on an object to make it move.
• when a force moves an object, energy is transferred - work is done.
• calculate work done by: Work done = Force x Distance          (WD= F x D)
• work done units = joules (J)
• Work done to over come friction is transferred as heat energy to objects that rub together and their surroundings.
• eg. brakes on a car - heat up with work done against the friction of the brake pad causes heat energy.
• meteorites burning up in the atmosphere because of the work done against the friction from air resistance.
• rubbing hands together  - muscles do work against the friction from hands causes them to warm up.
• practice question
• A builder pushed a wheelbarrow a distance of 5metres across flat ground with a force of 5N.
• how much work was done by the builder?
• WD = F x D        50 X 5 = 250   WD = 250J

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