Work done = ?
How much work is done when a box with a mass of 3 kg is lifted from the floor onto a 2.5 meter high shelf ?
(Remember: The force of gravity on
a mass of 1 kg = 10 N)
If 270,000 J of work was done to move a car 40 m, what force was used?
Calculate the kinetic energy of car, with a mass of 1,200 kg, travelling at 20 m/s.
Calculate the potential energy of a rock with a mass of 1,350 kg, on top of a slope 7 m high.
A crane can lift a weight of 2,250 N to a height of 23 m in 15 seconds.
What is the power of the crane?
A force of 20 N stretches a spring by 0.5 m.
Calculate the spring constant.
Describe and explain how the energy efficiency of vehicles can be improved by reducing idling losses.
Created by Mr S Lee over 1 year ago