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.
1 of 10
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
2 of 10
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
3 of 10
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.
4 of 10
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
5 of 10
What does the area under a force-displacement graph represent?
Work Done, as the equation for work done is force x displacement
6 of 10
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
7 of 10
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
8 of 10
What is the unit of Energy?
Joule
9 of 10
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
10 of 10
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?
Back
Card 4
Front
What is the equation and definition of Power?
Back
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?
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