Work done
- Created by: Roisin browne
- Created on: 25-04-13 20:27
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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
- how much work was done by the builder?
- A builder pushed a wheelbarrow a distance of 5metres across flat ground with a force of 5N.
- work is done when a force is exerted on an object to make it move.
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