Energy - Work When we move an object over some distance...

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Unformatted text preview: Work When we move an object over some distance while exerting a force on it in the direction of its movement, the force does work on the object . Work done by = Force × Distance travelled Force on object on object by object W = F × d (joules) = (newtons) × (meters) (S. I. Units) What can work do? • Speed an object up • Slow an object down. • Move an object against another force (such as gravity). 1 Power Power is the rate at which work is done : Power = Work done ÷ Time interval P = W/ Δ t (watts) = (joules)/(s) Examples of power: • A ”powerful” car can accelerate more rapidly. • Running up stairs uses more power than walking. • A ”powerful” light bulb burns more brightly. 2 Force Fields Force Field : A region in space where an ob- ject has a force exerted on it depending on its position. Examples: • The Earth creates a gravitational force field . The force on an object due to Earth’s gravity depends on the object’s distance from the center of the Earth....
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Energy - Work When we move an object over some distance...

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