This topic explores the relationship between work and energy. The equations for kinetic energy and change in gravitational potential energy are developed. The principles of force, energy and motion are used to analyse such safety features of cars as air bags and crumple zones.
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Created by Mr S Lee
about 6 years ago
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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 speed of a cannonball, with a mass of 5.8 kg travelling with 23,490 J
of kinetic energy.
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.
Complete the table below about car safety features and how they work.
Describe and explain how the energy efficiency of vehicles can be improved by reducing idling losses.
