Machines do the following: Transform energy, e.g. generator (mechanical to electrical) or steam turbine (heat to mechanical) Transfer energy, e.g. car linkages/drive train to rear wheel Multiply force, e.g. pulleys can lift more with less force Multiply speed, e.g. bicycle wheels move faster than gears Change direction of force, e.g. flag pole pulley, pull down to raise flag Two reasons to use a simple machine: The magnitude of the force which can be applied with out the aid of a machine is insufficient to move the required load.
(bicycle wheels; pull; down; to raise flag Two reasons) (bicycle wheels; is; insufficient to move the required load) (the force; can be applied; with out the aid of a machine) (gears; Change e.g.; direction of force)
bicycle wheels bicycle wheels the force gears
pull is can be applied Change e.g.
down to raise flag Two reasons
insufficient to move the required load
with out the aid of a machine
direction of force