Work, Energy, Power (A)

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• Created by: Kotoni_
• Created on: 08-04-16 15:40
What is the equation and definition for work done?
Force x Distance, One joule is the work done when a force of one newton moves an object one metre.
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What is the work done in lifting a 1kg object book a height of 1m onto a shelf?
9.81J, as 9.81 (force/mg) x 1 (distance) = 9.81
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A man walks at 0.5m/s to destination 4km away. The total force resisting his motion is 40N. What is the total work done by the man in reaching his destination?
160kJ, as 40N (force) x 4 (distance) = 160
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What is the equation and definition of Power?
Force x (Displacement / Time), 1 watt is the rate of working of 1 Joule per 1 second.
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A man walks at 0.5m/s to destination 4km away. The total force resisting his motion is 40N. What is the man's power?
20W, as 40N (Force) x [ 4km (Displacement) x 0.5 (Speed) ] = 20, as you have to calculate the time
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What does the area under a force-displacement graph represent?
Work Done, as the equation for work done is force x displacement
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A speed boats engine produces 80kW of power. When it is moving at 5m/s, Calculate the force applied by the boats propeller.
16kN, as Power = Force x Velocity, therefore 80kW = Force x 5m/s
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A sail boat is travelling at an angle of 30 degrees at a constant force of 500N. It takes 2 minutes to travel 200m. What is the power of the wind?
722W, as Power = Work done / Time therefore, P= (200m x cos30) / 120
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What is the unit of Energy?
Joule
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A car's engine provides 500N of power. What is the power output of the engine when the car is moving at 8m/s?
4,000W, as P=Fv therefore, P= 500N x 8m/s
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Other cards in this set

Card 2

Front

What is the work done in lifting a 1kg object book a height of 1m onto a shelf?

Back

9.81J, as 9.81 (force/mg) x 1 (distance) = 9.81

Card 3

Front

A man walks at 0.5m/s to destination 4km away. The total force resisting his motion is 40N. What is the total work done by the man in reaching his destination?

Card 4

Front

What is the equation and definition of Power?

Card 5

Front

A man walks at 0.5m/s to destination 4km away. The total force resisting his motion is 40N. What is the man's power?