P3 Physics Work and Power
Created by AP.
- Created by: A.P
- Created on: 20-01-13 10:15
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- Work and Power
- Work
- Work is done when a force moves an object in the direction in which the force acts.
- Work done (J) = Energy Transferred (J)
- Work done = Force x Distance Moved
- Power
- Power is the rate at which work is done.
- Power = Work Done / Time Taken
- Power = Work Done / Time Taken
- A person's power is greater when they run than when they walk.
- Power is also relate to force and speed.
- = Power
- = Work Done / Time Taken
- = (Force x Distance) / Time Taken
- = Force x (Distance / Time)
- Force x Speed
- = Force x (Distance / Time)
- = (Force x Distance) / Time Taken
- = Work Done / Time Taken
- = Power
- Some cars are more powerful than others. They travel faster and cover the same distance in a shorter time and require more fuel. The power rating of a car depends on its engine size. More powerful cars have greater fuel consumption.
- Fuel is expensive and a car with high fuel consumption is expensive to run.
- Fuel pollutes the environment.
- Car exhaust gases, especially carbon dioxide are harmful.
- Carbon dioxide is also a major source of greenhouse gases, which contribute to climate change.
- Power is the rate at which work is done.
- Weight
- Weight is a measure of the gravitational attraction on a body acting towards the centre of the Earth.
- Weight = Mass x Gravitational Field Strength
- A mass of 1 kg has a weight of about 10N on Earth.
- Work
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