E N E R G Y. AIMS Appreciate how energy affects our lives Describe the environmental considerations related to energy production Identify renewable energy sources Perform calculations to determine how much energy is present in a system
By using more energy efficient systems, such as light bulbs
(head) allowed to flow through a turbine
WORK DONE = FORCE X DISTANCE
A winch raises a lift of mass 1000kg to a height of 20m.
Calculate the minimum amount of work done by the winch
Weightlift = mg = 1000 x 9.81 = 9810N
Work Done (winch) = F x D = 9810 x 20 = 196.2KJ
Q1. During the loading process, a fork- lift truck lifts a pallet of bricks of mass 740kg up to a height of 2m. Calculate the minimum work done by the truck, and suggest a reason why the actual work done will be greater.
Q2. A mass of 50kg is raised to a height of 5m by a rope, which is wound around a pulley on a motor shaft of diameter 150mm as shown. Determine the amount of work done by the motor and the number of revolutions made during the lift.
EK = ½ m v2
EP = m g h
Ee = I t V
Eh = m c ΔT
Name the form of energy at each of the stages A, B, C and D