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WorksheetsEnergy & Power Form 3
Total questions: 12
Worksheet time: 4mins
State the definition of work.
The rate of doing work
The product of force and displacement in the direction of the force
The ability to do work
The work done to lift an object to a height
What is the S.I. unit for work?
force, F
work, W
newton, N
joule, J
Figure 1 shows an electromagnetic crane lifting a load weighing 2 500 N to a height of 4 m. Calculate the work done.
(a)
A labourer pulled a bucket of cement weighing 300 N from the ground to the first floor of a building using a pulley system. The first floor is 10 m from the ground. What is the work done by the labourer?
(a)
Energy is defined as
The rate of doing work
The product of force and displacement
The ability to do work
Work done divide by time taken
Energy is defined as
The rate of doing work
The product of force and displacement
The ability to do work
Work done divide by time taken
The S.I. unit for power is
watt, W
power, P
joule, J
newton, N
Figure 1 shows an electromagnetic crane lifting a load weighing 2 500 N to a height of 4 m. If the time taken by the crane to lift the load is 1.2 minutes, calculate the power of the crane.
(a)
State the formula for Gravitational potential energy
(a)
A ball bearing of mass 0.2 kg possesses kinetic energy of 3.6 J. What is the velocity, v of the ball bearing?
(a)
The original length of spring S is 20 cm. When the final force exerted on spring S is 20 N, its new length becomes 12 cm. Calculate the elastic potential energy possessed by the compressed spring S.
(a)
State the Principle of Conservation of Energy.
Energy cannot be created or destroyed but can only be converted from one form to another.
Energy can be created or destroyed but can only be converted from one form to another.
Energy cannot be created or destroyed but cannot be converted from one form to another.
